How to calibrate analog input module plc

plc analog input modules Some plc hardware calibration method, some use software calibration method, should prepare high-precision calibration of measuring instruments and stable input signal source, the number of samples to be taken as the average of the filtered larger value.
Hardware calibration method. S7-200 with EM235 analog input module, for example, analog input module has an offset adjustment potentiometer. Because only 0-20mA EM235 when the 4mA current applied to the input of a channel, read digital converted by programming software, adjust the offset potentiometer until the reading of 6,400.

Analog Input Module Features

plc analog input module features：
1, collecting multi-channel analog io module, industrial terminals, rail-mounted support.
2,485 interface input connected to the computer, and 485 provide optical isolation.
3, using MODBUS RTU communication protocol, enabling customers to unify PC management platform.
4, analog modules can be cascaded through 485 interface, easy system expansion.

Analog Input Module Definition

The analog input module is a remote site analog signal acquisition to the computer equipment, the use of RS-485 bus as a data communication line, provided to 485 analog functions, can simultaneously eight analog plc input module, and by RS-485 bus transfer to the computer. As a result of RS-485 interface as a communication interface, which is capable of transmitting a plurality of modules combination analog signal more large ones, and can be dispersed on a 485 line configuration, using the address code to distinguish, you can directly access the MODBUS RTU protocol configuration software.

digital output modules plc, which has several types, characteristics

igital output modules plc, which has several types, characteristics
According to different driving circuit, the digital output module can be divided into the following three categories:
High-power transistors and FET type - mainly used to drive DC loads.
Triac type - mainly used to drive an AC load.
Small relay type - used to drive AC or DC load, a contact signal outputplc digital input.
Switch if there is merit flexible output relay output AC and DC load large, slow to respond shortcomings
Advantages of fast reaction transistor output, shortcomings DC output, current, voltage is small.

Analog input and output module is good or bad

analog input module: Give a standard signal, look up the value of the mining right.
analog output module: output a value, using the following multi-meter.
If the range is consistent with the input connected to the output measured on the country, the bus portion of the output module to burn, so other channels can not be used is a continuous analog signal input and output, such as 4-20ma, 0-5v or 0 -10v, etc., than the column adjusting solenoid valve opening or used for any other use!

Function PLC communication modules

Function plc communication module, when the PLC communication port itself is not enough to use, because there may be more than one third-party PLC needs and communications instruments. Then you need to use the communication module plc, there are many types of communication module, a common serial module (RS232, RS485, RS422) and Ethernet communication module。

What is the definition of the analog input module

The analog input module is a remote site analog signal acquisition to the computer equipment, the use of RS-485 bus as a data communication line, provided to 485 analog functions, can simultaneously eight plc analog input module, and by RS-485 bus transfer to the computer. As a result of RS-485 interface as a communication interface, which is capable of transmitting a plurality of modules combination analog signal more large ones, and can be dispersed on a 485 line configuration, using the address code to distinguish, you can directly access the MODBUS RTU protocol configuration software.

plc modules in several categories

programmable logic control plc because of its high reliability, simple programming, versatility, small size, compact structure, easy installation and maintenance, etc., and in industrial control has been widely used. PLC modules are generally divided into the following categories:digital output module, analog input modules, analog output modules. In industrial control especially in the field of process control analog acquisition and control needs a relatively large amount, so the PLC analog input and output modules require more, and analog input and output modules are more expensive, increasing the analog input, output modules increases the cost and reduces the cost of the entire system, limit the application of PLC. This paper presents a simulation based on the amount of communication of input and output expansion module method seeks to solve this problem.

PLC input and output interfaces

The programmable controller is a digital computing operation of electronic systems, specialized applications in industrial environments. It uses memory can be programmed, used in instruction execution storage logical and sequential control, timing, counting and arithmetic operations such as operations and digital or analog input (I) and output (O) through the interface, to control various type of machine or production process.
Interface Plc modules and the electrical circuit is output through the input section (I / O) to complete. plc IO module integrates the PLC's I / O circuit, the input register reflecting the input signal, the output point to reflect the state of the output latch. Input module into the electric signal into a digital signal the PLC system, the opposite output module. I / O into the digital input (DI), switching output (DO), the analog input (AI), analog output (AO) modules.

— plc input modules, a method of low-cost expansion of output module

analog output plc, a method of low-cost expansion of output module programmable controller (hereinafter referred to as PLC) because of its high reliability, simple programming, versatility, small size, compact structure, easy installation and maintenance features, in the industrial control has been widely used. PLC modules are generally divided into the following categories: digital input modules, digital output modules, analog input modules, analog output plc. In industrial control especially in the field of process control analog acquisition and control needs a relatively large amount, so the PLC analog input and output modules require more, and analog input and output modules are more expensive, increasing the analog input, output module increases the cost and reduces the cost of the entire system, limit the application of PLC. This paper presents a method based on extended analog input and output modules of communication trying to solve this problem.

Programmable Logic Controller (PLC) software measures:

We have a strong self-test and protection.
① fault detection - software periodically to detect the external environment, such as a power failure, under voltage, battery voltage is too low and strong interference signals. So that timely treatment.
② Information Protection and Recovery - When sporadic fault condition occurs, does not destroy the plc industrial controller's internal information. Once the fault condition is removed, you can return to normal, continue the original program of work. Therefore, profibus module plc when the fault condition is detected, immediately put the current state stored in the memory, software with the memory is closed to the memory of any action to prevent the storage of information is obliterated.
③ Set the Watchdog WDT (Watchdog) - If the program execution time per cycle than the WDT specified time, indicating the program into an infinite loop, call the police.
④ strengthen inspection and verification procedures - once the program is wrong, call the police, and stops executing.
⑤ the program and dynamic data backup battery - after a power outage, use battery-powered back-up, and information about the status will not be lost.
PLC factory pilot project, there is an immunity test. It is required to withstand the amplitude of 1000V, the rise time 1nS, a pulse width of the pulse 1μS of interference. In general, the average time between failures of up to hundreds of thousands - tens of millions of hours; the system can be made up to 4 to 50,000 hours or longer.

Medium programmable control system

Medium plc industrial controller may provide the functionality and flexibility you need, do not have that kind of overhead systems, it is the perfect solution for medium-sized application projects. Select rack-based, modular package design standards and safety certification from the controller. Typical applications include complex machine control, batch processing and building automation.

PLC current loop transmission

Application of the current control loop is started in the early 1900s teletype, the earliest use of the 0-60mA loops and later changed to 0-20mA loop, programmable logical controllers system is the first to use the 4-20mA loop.
4-20mA current loop has many advantages. Need to be carefully calculated in the traditional discrete component designs, and compared with the current integrated 4-20mAIC, circuit take up a lot of space.
Any current values ​​measured are representative of certain information. Practical applications, 4-20mA current loop in 0mA to 24mA current range. But 0mA to 4mA and 20mA to 24mA current range for diagnostics and system calibration. Due to lower than 4mA and above 20mA are used for diagnostics, it is believed readings between 0mA and 4mA could indicate a broken wire in the system. Similarly, between 20mA and 24mA between readings can indicate a potential short circuit occurred in the system.
Plus 4-20mA communications Highway Addressable Remote Sensor, which is backward compatible with 4-20mA instrumentation. In HART system uses microprocessor-based intelligent integration of field devices enables two-way communication. The HART protocol capable of carrying additional digital information on the same line 4-20mA analog current signal for process control.
plc analog input output module functions can be divided into several functional groups. Many plc controller manufacturer vendors will integrate these functions as separate modules, each module with features vary with the specific application. Many modules have multiple functions, it can interface with a variety of sensors. However, for specific applications will design special modules or expansion modules, such as in most cases: resistance temperature detector (RTD), sensor, or thermocouple sensor. In general, all modules have the same core functions: analog input, analog output, distributed control (eg fieldbus), interface, digital input and output (I / O), CPU and power supply.

Nanda programmable logic controller suppliers

PLC control system and electrical control system distinguish the

PLC control system compared with the electrical control system, there are many similarities, there are many different. The difference is mainly in the following areas:
1) Judging from the control method, the electrical control system control logic hardware wiring, mechanical relay contacts using series or parallel, etc. combined into a control logic connections are many and complex, bulky, power consumption, system configuration, the I would like to change or add functionality more difficult. In addition, a limited number of contacts of the relay, the electrical control system flexibility and scalability is very limited. The PLC technology uses a computer, which controls the way the program logic is stored in memory, to change the control logic simply by changing the program, which is easy to change or increase the system functionality. System wiring small, small size, low power consumption, and PLC-called "soft-relay" is essentially a state of the memory cells, so "soft relay," the number of contacts is unlimited flexibility and scalability plc controller manufacturer system good .
2) From the work point of view, in the relay control circuit, when the power is turned on, the circuit is subject to all relays are in the state, that is, the pull of the relays are energized at the same time, should not be subject to some kind of pull-in relay conditions can not pull, this way of working called parallel work. The plc ethernet module user program is executed cyclically according to a certain order, so that each soft relays are in a cyclical scan cycle turned in by the same conditionality order each relay operation depends on the program scan order, this way of working is called Serial work.
3) Judging from the speed control, relay control system relies on mechanical contact action to achieve control, low operating frequency, mechanical contacts will appear jitter. The PLC to achieve control of program instructions by controlling the semiconductor circuit, high speed, program instruction execution time in microseconds level, and will not appear contact bounce problem.
4) Judging from the timing and the counting control, electrical control system uses the operating time of the relay delay the time control, time delay relay susceptible to ambient temperature and temperature changes, the timing accuracy is not high. The PLC semiconductor integrated circuit as a timer, a clock pulse is generated by a crystal oscillator, high precision, wide time range, the user can set the timer value in the program as needed to facilitate changes, affected by the environment, and the PLC have counted functions, and electrical control systems generally do not have the counting function.
5) From the point of view of reliability and maintainability, since the electrical control system uses a large number of mechanical contact which mechanical wear, arc burns, short-lived, multi-link system, the reliability and maintainability of the more difference. The PLC large number of switching operation performed by non-contact semiconductor circuit to complete its long life, high reliability, PLC also has a self-diagnostic function, able to detect its own fault, displayed to the operator at any time, and can dynamically monitor control the implementation of the program for on-site commissioning and maintenance more convenient.

The sudden emergence of micro programmable logic controller

Traditional micro plc temperature control module is generally 8 to 64 digital I / O, 1 ~ 4 points analog I / O, small size, can be installed directly in the machine. But now the miniature programmable controller in addition to the above functions, can be compared with the already large programmable controllers on the network functions and man-machine interface functions, this type of micro programmable logic controller manufacturer is currently the fastest fast.

Penetration programmable controller

programmable logical controllers is to adapt the plant control systems and enterprise information management systems increasingly combine trends and adapt to the control level make between different brands of programmable logic controllers, PLC and Distribution effective exchange of data between the requirements of control system. In fact, the realization of multi-tasking system, improve network capabilities, software integration makes the development of information technology, very easy to integrate with a programmable logic controller system.

Programmable Logic Controller Development in China and Countermeasures

The current development of the programmable logic controller (plc) suppliers of the main faces of the three problems. In the rapid development of the international situation, programmable logic controller, with independent intellectual property rights, China has no one on the technical level, can compete internationally programmable controller products, mainly due to the foundation of the whole industry is still There are some gaps, such as aspects of chip manufacturing, mold processing limitation of our development. The second is, in fact, also a question of economic competition competitive level. Now 95% of the domestic market occupied by foreign PLC Programmable Logic Controller, medium and large programmable controller, almost all dominated by several major foreign companies, as China continues to expand the use of field programmable logic controller , the market is growing, however, several major foreign companies almost every year for the market introduction of new products, once people use a new product, they will gradually increase the market price, not our own independent intellectual property rights In economic competition can only be passive. Third, the level of the market order, with the deepening of China's reform and opening up, especially after joining the WTO, China's huge market share greatly attracted foreign companies, they open up the market a wide range of methods are based on an agency sales channels, each company's distributors, system integrators will have dozens, even hundreds of many, resulting in intense competition our distributors, system integrators among these disorderly competition is international large companies divide and rule, get a stable high profits to create the conditions.

Application of Programmable Controller (PLC)

Currently, PLC has been widely applied at home and abroad in metallurgy, petroleum, chemicals, building materials, machinery manufacturing, electric power, automobile, light industry, environmental protection and cultural entertainment and other industries, with the continuous improvement PLC cost performance, its applications continue expand. From the application type, application plc IO module can be broadly summarized as follows:
1. logic control switch
Using PLC basic logic operations, timing, counting and other functions to implement logic control, can replace traditional relay control for stand-alone control, multi-cluster control, automatic production line control, such as: machine tools, injection molding machines, printing machinery, assembly lines , plating lines and elevator control. This is the most basic application PLC, PLC is the most widely used applications.
2. Motion Control
Most PLC has to drag a stepper motor or servo motor single or multi-axis position control module. This feature is widely used in a variety of mechanical equipment, such as machine tools, assembly machinery, robots and other motion control.
3. Process Control
Large and medium-sized plc cpu modules has multi-channel analog I / O modules and PID control functions, and some small-scale PLC also has analog input and output. So PLC enables analog control, and has PID control function PLC may constitute a closed-loop control for process control. This feature has been widely used in boilers, reactors, water, wine, and closed-loop position control and speed control and so on.
4. Data Processing
Modern PLC have math, data transfer, conversion, and table sorting and other functions, can collect, analyze and process the data, while the data via the communication interface is transmitted to other intelligent devices, such as computer numerical control (CNC ) device for processing.
The communication network
PLC communications, including communications, programmable logical controllers systems and general-purpose computer PLC and PLC, PLC and host computer, PLC and other intelligent devices can directly or through the communication processing unit, a conversion unit connected to the communication network to achieve the exchange of information and may constitute "centralized management, decentralized control," the multi-level distributed control system to meet the needs of factory automation (FA) systems development.

Data communication between analog modules

Buffer register (BFM) allocation

FX series PLC basic unit and FX - 4AD, FX - 2da etc. analog module between data communication is performed by the from and to instructions, communication modules plc ,from is basic unit reads data from the FX -- 4AD, FX - 2da instruction, the TOS are from the basic unit writes the data to the FX -- 4AD, FX - 2da instruction. Actually read and write operations are FX - FX, 2DA - 4AD buffer register BFM.

This buffer register consists of 16 registers of 32 bits, plc communication modules ,numbered #31 1 BFM#0.

Determination the number of analog output module

In the right FX series programmable controller basic unit can connect up to eight special function modules, plc controller suppliers ,which are numbered from the one closest to the base unit begins sequentially numbered from 0 to 7. This configuration uses FX2N48 point basic unit, connecting FX-4AD, FX-4DA, FX-2AD 3 block simulates modules, their numbers are numbers 0,1,2. This does not affect the right of the three modules extend the number two, but it will affect the total input and output points. 3 analog modules occupy a total of 24 points, digital output plc  then the basic unit and expansion of the total input and output points can only have 232 points.

Analog output module

In FX series PLC basic unit right, analog output plc you can connect up to 8 pieces of special function modules and their number from the closest to the basic unit that started sequentially numbered from 0 to 7.

FX2N commonly used analog output module FX2N-4DA, FX2N-8DA, FX2N-2DA analog output module.

FX - 2DA is a 2 channel 12 bit D / A converting module, and it is an output module with high accuracy. By simply adjusting or depending on the instruction of a programmable controller, high-speed counter modules the range of analog output can be changed. The reading and writing of data such as instantaneous values and setting values are carried out with TO / FROM instructions.

FX2N commonly used analog input module

FX2N commonly used analog input module fx2n-2ad, programmable logic controller manufacturer fx2n-4ad and core of analog input module and a temperature sensor input module. FX - 2AD 2 channel 12 bit A / D converter module.

According to the external connection method and PLC instruction, input voltage or current input, plc analog input module  input module with high accuracy. Through simple adjustments or according to the PLC instruction can change the range of the analog input. The instantaneous value and the set value of the data read and write using FROM / TO instruction.

PLC analog input and output module

Q: now need to add equipment such as temperature measurement system, there are two analog modules PLC, 8*12BIT and AI were AI 8*TC, two plc analog input output module . I am alsoJust contact this thing, cannot read what is the meaning of. Please explain.

A: depends on your temperature element type, TC this is only if the thermocouple, thermal resistance can not.
Of course, you can choose a set of temperature transmitter parameters, converting the thermocouple and thermal resistance signal for 4~20mA, communication module plc and then to the general AI module You can.

plc analog input modules and the switch

The input module will transform electrical signals into digital signals into the PLC system, contrary to the output module. I/O switch quantity input (DI), the switch output (DO) (AI), plc input output modules ,analog input, analog output (AO) module. The switch is the only opening and closing (1 and 0) of two kinds of state signal, analog quantity refers to the continuous variable.

Common I/O as follows, switch, according to the voltage level, 220VAC, 110VAC, 24VDC, by way of isolation, plc analog input module ,isolation and transistor isolation relay.

Plc analog output mod

In or on the time value of the physical quantity called continuous analog, plc digital input output module, respectively, generally with AI / AO, said. PLC analog output mode refers to the amount of the size of the control system is a continuous value in a certain range, such as temperatures, from 0-100, pressure from 0-10MPA, the opening degree of the liquid level from 1-5 meters, electric valve from 0-100%, and so on, these quantities are analog.
Outputs for analog is "analog output plc." The most common places electronic technology, such as DA conversion output is the analog current / voltage (continuously variable current / voltage), plc analog output module of the rectifier circuit is analog. Mathematically, if the physical quantity of an output at time t a (t) form a (t) = F (t) is a continuous function, then the output of the analog.

Plc analog input modules

PLC analog input module is part of the plc modular control system. Mainly responsible for receiving information field devices or control equipment, and signal level conversion, and then transfer the conversion result to the plc cpu program processing.
"PLC analog and communication control application practice" Mitsubishi FX2N PLC target models, introduced PLC in the analog control and communications control. In the analog control, highlight the Mitsubishi FX2N cpu module plc analog special module and PID control applications; communication control applications, focusing on the use of serial communication command RS were smart devices such as PLC and inverter communication control and communication program prepared by.

plc analog output modules main advantages

Analog input / output modules for handling automation system analog input / output tasks. Analog sensors and actuators can be connected to the automation system via these modules.
Use analog input / output modules to provide users with the following advantages:
Best Adaptability:
Through the appropriate module combination , plc analog output modules can adjust the input / output points according to specific  plc cpu module tasks. Saving unnecessary costs.
Powerful analog processing technology :
A variety of input / output range and a variety of high-precision allows the connection of analog sensors and actuators. Analog input module has the following mechanical properties :
Compact design
Rugged plastic enclosure inside include :
The red LED indicates a fault group
Front connector plug options, mounted behind the front door and get protection.
Label area on the front door .
Connector pin assignment , plc analog output modules for wiring inside the front door .
Easy installation
Modules are mounted on a DIN rail and  plc sequence of events recording module connected to adjacent modules through the bus connector. No slot rules ; enter an address determined by the slot.
When used in the ET 200M distributed I / O system with active bus modules can be digital input / output module is hot-swappable , without any response. Other modules continue to work .
User wiring
Device unit connected via the front connector. When the first connection module, the coding device is locked in the connector such Programmable Output Module  that the connector can only be adapted to the same type of module . When replacing the module of the same type for the new module can be kept intact state before wiring connector. This avoids the process of replacing the module will be pre- wired connector into the wrong module.

Some analysts plc analog output modules in

Is the A / D module, right, and his function is to 4-20MA current signal

into digital, his task is complete, as the data also needs to become a PLC

program processing, computing, or does not make sense. Because of the PLC

CPU unit can not directly accept a current or plc controller suppliers  voltage signal, a digital

signal only recognize him, that the data in the PLC in full is the

existence of a binary 0 or 1, and A / D module is a bridge, is responsible

for the conversion. However, after the conversion  Nanda micro smart plc procedures also need to

become data you need. That unit is to grab the CPU A / D in the data

module to process, after the program operation to get useful data, this

data may be temperature, weight, pressure, and finally displayed on the

touch screen, the touch screen has a generally driver, which has the PLC

channel, you make a connection can be a variable, since the touch screen

itself is also quite a drive axle, PLC where each state corresponds touch

point in the channel, where the variables corresponding to the  touch the

channel, an association can then collect the data. If you use a computer,

using VB, VC and other programming will all  Nanda cpu module plc develop their own drive this

one, and this thing may become significant. This is the point with the

touch screen is good, do not have to write this newsletter, directly on

the line.

plc analog input modules and load power What is the difference

Restart the computer Cause Solution:
1, there may be a BIOS settings problem, restore the default settings into the BIOS or the motherboard battery out, Flip, discharge. Objective: To restore the default settings for the BIOS values, excluding the BIOS default automatic restart or shutdown cooling phenomenon.
2, the restart occurs before the restart occurs if the application software or download software to run the program, then restart the plc controller suppliers  software may be caused, in general the program to uninstall and re-install the software, if the fault persists, then the software itself is wrong, you can not to use.
3, anti-virus software in Safe Mode using viruses, troubleshooting if the restart, restart the failure is caused by a virus.
4, boot into safe mode by pressing F8 after the exit in normal mode. Also available system comes with System Restore feature to restore, if the restart troubleshooting, restart the system file damage is caused.
5, if the fault persists, then check the power supply, power quality is poor, aging or power is too small to meet the power needs of the various parts of a computer, high-quality power supply can be replaced, if troubleshooting is to restart the power failure caused.
6, a device restart when hot-plug if the computer going on, according to the first three resolved.
7, then use the process of elimination, check memory, video card, CPU, CPU fan, motherboard, etc.
8, check the memory, memory low quality, poor  Nanda industrial automation plc cooling, overclocking, different brands of memory mixed interpolation and CAS setting too low can cause the computer to restart, test method can be used to replace the memory, and memory in the BIOS parameters are adjusted accordingly .
9, check the motherboard, motherboard aging, capacitor failure or exploding, motherboard and chassis backplane can be caused by a short circuit, etc. reboot, you can remove the motherboard from the chassis to inspect or test, then check the CPU heatsink fan base silicone is dry, If dry, the CPU fan on silica gel to clean and re-coated with silicone to good. Then check the CPU fan rotation, and the CPU temperature is normal.
10, cleaning method: a host computer through the  Nanda cpu module plc dust components to be cleaned troubleshooting methods. Dust is also caused by one computer to automatically restart failed factors, dust can cause aging of components, pin oxidation, poor contact and short circuit faults. For dust caused by these failures, the general use of more effective cleaning method.

Some problems plc analog output modules in

Upper and lower limits of analog input values ​​are set to 20 and 0 , had everything normal, in the absence of the analog signal access , the software displays a value of 0 , there is signal Nanda plc digital input module  access , they also have a normal display, but under normal use two or three days , the upper and lower limits remain unchanged, the analog input value in the absence of wiring is 6.8 , all the channels I have tried are 6.8 , then the company gave me a new simulation input module , installed after the beginning is normal, but it is the same problem in a couple of days later , I ask an expert what causes ?
Also this PLC as well as a relay output module , 2, 3 and 4-channel connection of solenoid valves, found often there will be  Nanda micro smart plc a problem , sometimes when I start solenoid valve, status lights all of a sudden relay output modules are extinguished , the network does not pass , after a minute or so , PLC will automatically linked to the network, the solenoid valve to start this and what is the reason ? I have checked the wiring before , are not the problem
You said power module before Nanda modular plc  I checked, input 220V, power module output is 5.09V, I then adjust it to 5.01V, it should be no problem , there is nothing good advice.

plc analog io modules leveraging the rapid growth of the Internet of Things

The past two years by the domestic economic slowdown, sluggish economic recovery abroad, the market size of the PLC showed a sharp downward trend. Things develop guidance and related documents formally introduced this year, driven by the Internet of Things and smart grid, PLC industry will Nanda PLC programmable logic controller plc  rebound and achieve rapid growth.
Development and construction of things to cover broader, PLC as the current information collection, control of the main technical means, is bound to play a key role in the construction of things. PLC is a major part of which is composed of automation equipment, industrial automation  Nanda PLC micro smart plc production with industrial Ethernet applications more widely, the production process but also the development of network information technology trends, PLC or by the large-scale application of networking technology of the machine again quickly development. In the course of development of control technology, with computer technology, control technology, digital technology, communications technology and other high-tech network of closely related. Formal various  Nanda PLC high-speed counter modules emerging technologies, and promote the development of the programmable controller. Let PLC programmable controller to replace relay logic control become mainstream control technology. The basic mechanism of a power PLC, a central processing unit (CPU), memory, input and output circuits excuse functional module, communication module components. It works by the scanning technology implementation phase, the user program, the output refresh period of three parts.

plc analog output modules products emerging in recent years introduced a number of application areas

( 1 ) In recent years , and Lee Mining PLC product innovation , its reliability, performance and other advantages have been widely recognized by users. And Lee mineral widely used in low voltage feed switch , high Nanda Power supply module plc voltage power distribution equipment , combination switch , load center and other products with PLC products are gradually replaced protectors and ordinary PLC microcontroller products , equipment and mine started when Lee became some of the PLC mining equipment and advantages of selling the company's products .
 ( 2 ) the use of PLC to develop a new type of solar thermal water heaters, solar water heaters can overcome the traditional presence affected by climate , temperature instability and other defects , but also focus on water supply for multiple users. Siemens S7-200 series PLC control operation of solar thermal water heaters with water temperature , water PLC Programmable Logic Controller  level and flow control corresponding temperature , level and flow sensors and PLC analog input extension implementation. Meanwhile , PLC and Siemens integrated text display T D400 achieve interactive interface for the collector water heater temperature and water level inside the real-time online display and settings.
 ( 3 ) With the development and social progress of science and technology, automatic doors in everyday life has also been widely used. Automatic door systems in the past generally use logic control module , due to the high failure rate , low reliability , convenient maintenance and other reasons, will be phased out . Used Mitsubishi PLC automatic door control system as a controller to a transmitter and a receiver of ultrasonic switch photoelectric switch as an input device of the system, two different sensor input control signal to the PLC, the PLC system using code tables , I / O allocation table and automatic door control actions such as the implementation process in order to achieve control of the door open or closed ( rising or falling ) .

PLC analog input modules open forum

PLC is one of the most important factory automation control devices , with a wide range of applications in the factory. As technology advances , PLC has been out of the " logic control ," the simple scope , PLC has more analog-digital conversion , digital to analog conversion, high-speed counting , speed control , position control, axis positioning control, temperature control, PID control , telecommunications and high-level language programming and other functions.
Due to historical reasons, the development of technology , the traditional PLC products is still relatively closed . But in the mutual PLC Programmable Logic Controller  exchange of information on real-time , deepening liquidity requirements today , PLC control to continue to adapt to the needs of the plant , openness trend has become increasingly evident. With the continuous opening of the PLC , which has a much richer functionality . This month we will be more open to discuss the development of PLC functions .
Open open trend has emerged PLC is inevitable , closed PLC will give users a great deal of inconvenience. For example, the need to expand a factory or during use and the introduction of a number of other manufacturers of equipment , PLC because each vendor uses a different means of communication, can not communicate with each other , it will cause the new system is not compatible with the original system . Siemens have noticed several years ago this problem and focus on the promotion of Totally Integrated Automation (TIA) concept , with the PROFIBUS fieldbus technology to facilitate communication with higher performance PLC . Open PLC is inevitable . Judging from the current development of automation , overall system performance is more important in the processing equipment , which makes people pay more attention with the performance PLC and peripheral devices , the protagonist of the status of the PLC has been gradually fading. Effectively carry PLC and peripheral devices communicate , not only for the input , output , analog , etc., also includes servo , scanning and intelligent instruments and so there will be more demand . Now  Nanda Power supply module plc users in many applications the choice of the PLC are no longer considered too technical degree , but the question of which brand to choose from. These are important reasons to promote the PLC open. The current situation on the market trend also proved PLC openness . Although the major PLC manufacturers according to their respective surfaces are still ways to promote the production of PLC, but if you observe carefully , all manufacturers have been from a different perspective on the function of the open PLC made ​​improvements . Many types of PLC can communicate using a specific method , the Internet .
But we should also be aware that , although we are in the efforts to open , but may be due to the open deep meaning , so that there is no guarantee that he would dare the PLC is truly open .

a brief introduction plc analog output modules in

You say that your sensor with analog output , analog input , ( meaning the module is to convert your voltage or current value to digital, then you can calculate the slope of the current form of the temperature or pressure . )
If you are asked to read the temperature or pressure PLC Plc controller manufacturers  values ​​, you must sensors with analog outputs and analog outputs. So you buy a simulation module , connect the analog module with PLC, analog output and input sensor is connected with the module ( module wiring diagram of course you do not have to worry about this ) . When the pass on the power after the current value of the module automatically detects the sensor and then convert it to digital, you calculate a formula based on its slope slope table , so you can know the current value of the temperature or pressure .
If so then what is the analog output module output ? Is a need to convert digital or specific value or quantity of modules and digital output is the same as an electric signal ?
The same output is a voltage or current signal wiring PLC Plc logic controllers  relationship with you , then the output current is the current line , then the line voltage is the output voltage. Temperature can be equipped with PT100, if needed pressure with pressure transmitter (4-20mA output ) , then select the range to be based on the meter .
What is the analog of the PLC are the same, as long as the project based on the amount of data can be transformed .
In addition , many of the instruments have a communication function or frequency output, which could save an AD module connection is also convenient.

plc analog input modules of software or hardware reason for the crash analysis

Programmable Logic Controller PLC runtime situation may occur crash , which caused unpredictable losses to industrial Nanda intelligent plc  production, and therefore , we must first understand the cause of the crash PLC , for reasons of investigation, software or hardware errors are likely to cause crashes PLC , the following were introduced :
1 , hardware (1) I / O channeling electrical , PLC automatically detect I / O errors , enter STOP mode. (2) I / O is damaged, the program proceeds to the needs of the I / O feedback signal , the instruction is  Nanda programmable logic control plc not executed down . ( 3 ) expansion module ( function type, such as A / D) line interference or open circuit . ( 4 ) power supply portion interference or failure. ( 5 ) PLC connection module and address allocation failed module out so ( 6 ​​) cable caused . 2 , software ( 1 ) trigger an infinite loop . ( 2 ) the program changed the contents of the system parameters area , but no initialization section. ( 3 ) protection  Nanda logic controller program starts : hardware protection , restrict the use of time ( for loan recovery ) 4 ) Data overflow step is too large, the watchdog ( can be modified DOG time ) action.

Some analysts plc analog output modules in

Is the A / D module, right, and his function is to 4-20MA current signal

into digital, his task is complete, as the data also needs to become a PLC

program processing, computing, or does not make sense. Because of the PLC

CPU unit can not directly accept a current or plc controller suppliers  voltage signal, a digital

signal only recognize him, that the data in the PLC in full is the

existence of a binary 0 or 1, and A / D module is a bridge, is responsible

for the conversion. However, after the conversion  Nanda micro smart plc procedures also need to

become data you need. That unit is to grab the CPU A / D in the data

module to process, after the program operation to get useful data, this

data may be temperature, weight, pressure, and finally displayed on the

touch screen, the touch screen has a generally driver, which has the PLC

channel, you make a connection can be a variable, since the touch screen

itself is also quite a drive axle, PLC where each state corresponds touch

point in the channel, where the variables corresponding to the  touch the

channel, an association can then collect the data. If you use a computer,

using VB, VC and other programming will all  Nanda cpu module plc develop their own drive this

one, and this thing may become significant. This is the point with the

touch screen is good, do not have to write this newsletter, directly on

the line.

plc analog input modules and load power What is the difference

Restart the computer Cause Solution:
1, there may be a BIOS settings problem, restore the default settings into the BIOS or the motherboard battery out, Flip, discharge. Objective: To restore the default settings for the BIOS values, excluding the BIOS default automatic restart or shutdown cooling phenomenon.
2, the restart occurs before the restart occurs if the application software or download software to run the program, then restart the plc controller suppliers  software may be caused, in general the program to uninstall and re-install the software, if the fault persists, then the software itself is wrong, you can not to use.
3, anti-virus software in Safe Mode using viruses, troubleshooting if the restart, restart the failure is caused by a virus.
4, boot into safe mode by pressing F8 after the exit in normal mode. Also available system comes with System Restore feature to restore, if the restart troubleshooting, restart the system file damage is caused.
5, if the fault persists, then check the power supply, power quality is poor, aging or power is too small to meet the power needs of the various parts of a computer, high-quality power supply can be replaced, if troubleshooting is to restart the power failure caused.
6, a device restart when hot-plug if the computer going on, according to the first three resolved.
7, then use the process of elimination, check memory, video card, CPU, CPU fan, motherboard, etc.
8, check the memory, memory low quality, poor  Nanda industrial automation plc cooling, overclocking, different brands of memory mixed interpolation and CAS setting too low can cause the computer to restart, test method can be used to replace the memory, and memory in the BIOS parameters are adjusted accordingly .
9, check the motherboard, motherboard aging, capacitor failure or exploding, motherboard and chassis backplane can be caused by a short circuit, etc. reboot, you can remove the motherboard from the chassis to inspect or test, then check the CPU heatsink fan base silicone is dry, If dry, the CPU fan on silica gel to clean and re-coated with silicone to good. Then check the CPU fan rotation, and the CPU temperature is normal.
10, cleaning method: a host computer through the  Nanda cpu module plc dust components to be cleaned troubleshooting methods. Dust is also caused by one computer to automatically restart failed factors, dust can cause aging of components, pin oxidation, poor contact and short circuit faults. For dust caused by these failures, the general use of more effective cleaning method.

Some problems plc analog output modules in

Upper and lower limits of analog input values ​​are set to 20 and 0 , had everything normal, in the absence of the analog signal access , the software displays a value of 0 , there is signal Nanda plc digital input module  access , they also have a normal display, but under normal use two or three days , the upper and lower limits remain unchanged, the analog input value in the absence of wiring is 6.8 , all the channels I have tried are 6.8 , then the company gave me a new simulation input module , installed after the beginning is normal, but it is the same problem in a couple of days later , I ask an expert what causes ?
Also this PLC as well as a relay output module , 2, 3 and 4-channel connection of solenoid valves, found often there will be  Nanda micro smart plc a problem , sometimes when I start solenoid valve, status lights all of a sudden relay output modules are extinguished , the network does not pass , after a minute or so , PLC will automatically linked to the network, the solenoid valve to start this and what is the reason ? I have checked the wiring before , are not the problem
You said power module before Nanda modular plc  I checked, input 220V, power module output is 5.09V, I then adjust it to 5.01V, it should be no problem , there is nothing good advice.

plc analog io modules leveraging the rapid growth of the Internet of Things

The past two years by the domestic economic slowdown, sluggish economic recovery abroad, the market size of the PLC showed a sharp downward trend. Things develop guidance and related documents formally introduced this year, driven by the Internet of Things and smart grid, PLC industry will Nanda PLC programmable logic controller plc  rebound and achieve rapid growth.
Development and construction of things to cover broader, PLC as the current information collection, control of the main technical means, is bound to play a key role in the construction of things. PLC is a major part of which is composed of automation equipment, industrial automation  Nanda PLC micro smart plc production with industrial Ethernet applications more widely, the production process but also the development of network information technology trends, PLC or by the large-scale application of networking technology of the machine again quickly development. In the course of development of control technology, with computer technology, control technology, digital technology, communications technology and other high-tech network of closely related. Formal various  Nanda PLC high-speed counter modules emerging technologies, and promote the development of the programmable controller. Let PLC programmable controller to replace relay logic control become mainstream control technology. The basic mechanism of a power PLC, a central processing unit (CPU), memory, input and output circuits excuse functional module, communication module components. It works by the scanning technology implementation phase, the user program, the output refresh period of three parts.

plc analog output modules products emerging in recent years introduced a number of application areas

( 1 ) In recent years , and Lee Mining PLC product innovation , its reliability, performance and other advantages have been widely recognized by users. And Lee mineral widely used in low voltage feed switch , high Nanda Power supply module plc voltage power distribution equipment , combination switch , load center and other products with PLC products are gradually replaced protectors and ordinary PLC microcontroller products , equipment and mine started when Lee became some of the PLC mining equipment and advantages of selling the company's products .
 ( 2 ) the use of PLC to develop a new type of solar thermal water heaters, solar water heaters can overcome the traditional presence affected by climate , temperature instability and other defects , but also focus on water supply for multiple users. Siemens S7-200 series PLC control operation of solar thermal water heaters with water temperature , water PLC Programmable Logic Controller  level and flow control corresponding temperature , level and flow sensors and PLC analog input extension implementation. Meanwhile , PLC and Siemens integrated text display T D400 achieve interactive interface for the collector water heater temperature and water level inside the real-time online display and settings.
 ( 3 ) With the development and social progress of science and technology, automatic doors in everyday life has also been widely used. Automatic door systems in the past generally use logic control module , due to the high failure rate , low reliability , convenient maintenance and other reasons, will be phased out . Used Mitsubishi PLC automatic door control system as a controller to a transmitter and a receiver of ultrasonic switch photoelectric switch as an input device of the system, two different sensor input control signal to the PLC, the PLC system using code tables , I / O allocation table and automatic door control actions such as the implementation process in order to achieve control of the door open or closed ( rising or falling ) .

a brief introduction plc analog output modules in

You say that your sensor with analog output , analog input , ( meaning the module is to convert your voltage or current value to digital, then you can calculate the slope of the current form of the temperature or pressure . )
If you are asked to read the temperature or pressure PLC Plc controller manufacturers  values ​​, you must sensors with analog outputs and analog outputs. So you buy a simulation module , connect the analog module with PLC, analog output and input sensor is connected with the module ( module wiring diagram of course you do not have to worry about this ) . When the pass on the power after the current value of the module automatically detects the sensor and then convert it to digital, you calculate a formula based on its slope slope table , so you can know the current value of the temperature or pressure .
If so then what is the analog output module output ? Is a need to convert digital or specific value or quantity of modules and digital output is the same as an electric signal ?
The same output is a voltage or current signal wiring PLC Plc logic controllers  relationship with you , then the output current is the current line , then the line voltage is the output voltage. Temperature can be equipped with PT100, if needed pressure with pressure transmitter (4-20mA output ) , then select the range to be based on the meter .
What is the analog of the PLC are the same, as long as the project based on the amount of data can be transformed .
In addition , many of the instruments have a communication function or frequency output, which could save an AD module connection is also convenient.

PLC analog input modules open forum

PLC is one of the most important factory automation control devices , with a wide range of applications in the factory. As technology advances , PLC has been out of the " logic control ," the simple scope , PLC has more analog-digital conversion , digital to analog conversion, high-speed counting , speed control , position control, axis positioning control, temperature control, PID control , telecommunications and high-level language programming and other functions.
Due to historical reasons, the development of technology , the traditional PLC products is still relatively closed . But in the mutual PLC Programmable Logic Controller  exchange of information on real-time , deepening liquidity requirements today , PLC control to continue to adapt to the needs of the plant , openness trend has become increasingly evident. With the continuous opening of the PLC , which has a much richer functionality . This month we will be more open to discuss the development of PLC functions .
Open open trend has emerged PLC is inevitable , closed PLC will give users a great deal of inconvenience. For example, the need to expand a factory or during use and the introduction of a number of other manufacturers of equipment , PLC because each vendor uses a different means of communication, can not communicate with each other , it will cause the new system is not compatible with the original system . Siemens have noticed several years ago this problem and focus on the promotion of Totally Integrated Automation (TIA) concept , with the PROFIBUS fieldbus technology to facilitate communication with higher performance PLC . Open PLC is inevitable . Judging from the current development of automation , overall system performance is more important in the processing equipment , which makes people pay more attention with the performance PLC and peripheral devices , the protagonist of the status of the PLC has been gradually fading. Effectively carry PLC and peripheral devices communicate , not only for the input , output , analog , etc., also includes servo , scanning and intelligent instruments and so there will be more demand . Now  Nanda Power supply module plc users in many applications the choice of the PLC are no longer considered too technical degree , but the question of which brand to choose from. These are important reasons to promote the PLC open. The current situation on the market trend also proved PLC openness . Although the major PLC manufacturers according to their respective surfaces are still ways to promote the production of PLC, but if you observe carefully , all manufacturers have been from a different perspective on the function of the open PLC made ​​improvements . Many types of PLC can communicate using a specific method , the Internet .
But we should also be aware that , although we are in the efforts to open , but may be due to the open deep meaning , so that there is no guarantee that he would dare the PLC is truly open .

plc analog io module
Originally small plc logic controller, which is handling the switch. But now the PLC can handle analog signals, but the PLC computing power or weak, so-called analog is the analog computing simple arithmetic or comparison, and some introduced PID operation. So now the PLC can also analog, such as temperature, etc. to control.
Analog scaling
Because the correspondence between A / D (analog / digital), D / A (digital / analog) conversion between, S7-200 CPU internal representation of the external value of the analog signal, a certain mathematical relationship between the two. This relationship is the conversion between analog / numerical quantity.

For example, using a 0 - 20mA analog signal input, the S7-200 CPU inside, 0 - 20mA corresponds to the numerical range 0--32000; for 4 - 20mA signal, the corresponding internal value for 6400--32000.

If there are two sensors, the range is 0 - 16MPa, but one is 0 - 20mA output, and the other is 4 - 20mA output. They are at the same pressure, the different transmitter analog current magnitude, the value in the internal representation S7-200 different. Obviously scaling relationship that exists between the two. The case of the analog output is also roughly the same.

PLC input module

Provides a large number of features, such as user support plc programmable, commissioning and maintenance work.
High-speed execution of instructions:
The minimum instruction execution time of up to 0.01 μs, for the low-end performance of the device and create a new application program.
Floating-point arithmetic:
You can use floating-point operations efficiently even complex arithmetic functions.
User-friendly parameter assignment:
Only a software tool with a unified user interface, you can complete the work of all parameterized modules. This lowers the entry threshold and training costs.
Human Machine Interface (HMI):
PLC's operating system has been integrated with the user friendly interface services. These functions are no longer needed costly programming: SIMATIC HMI systems process data requests to the PLC, small plc to complete the transfer of these data in the desired update time. PLC operating system can autonomously complete the transfer process. And the full use of the same reference numerals and the database.
Diagnostic functions:
Intelligent diagnostic system CPU continuously detection systems, fault information and specific system events (for example, time errors, module failure, etc.) records. Use of environmental buffer record event information, and with a cut-off time, in order to facilitate future troubleshooting.
Password protection:
Use password protection function efficiently and reliably protect user information to prevent unauthorized copying and subject to change.

Use range of PLC

Its products have been widely used in environmental, power, medical equipment, telecommunications, aerospace, military and other fields. Committed to the development of hardware production, while also providing a variety of Altai measurement software, users can easily use VC, VB, C ++ Builder, Delphi, LabVIEW, LabWindows / CVI, Matlab and other languages platform Windows / 98/2000 / under a variety of operating systems to quickly build rich personal measurement system XP / 2003, Win7, WinCE, Linux, etc.
The main products:
Thermocouple input module, plc modules, counter / frequency module, Industrial Panel PC, analog input modules, analog output modules, digital input and output modules, digital input module, I / O modules, open collector output module, PXI data acquisition card, PCI data acquisition card, USB data acquisition card, PC104 + data acquisition card, PC104 data acquisition card, PC104 analog Input Card, PC104 analog output card, RS485 bus acquisition module, an Ethernet bus module, CAN bus module , GPRS wireless acquisition and transmission, serial communications card, quadrature encoder and counter cards, Zigbee wireless acquisition and transmission, RTU acquisition modules, motion control cards, digital cards, signal conditioning modules, terminal board, embedded motherboard, HMI, IPC, PXI chassis, plc programmable controllers, configuration software, etc.

plc analog output module
PLC Product Code: 449482677
4 analog output plc modules
※ Mitsubishi LINK RS-485 communication, support a variety of configuration software
※ output range: 0 ~ 20mA, 4 ~ 20mA
※ Resolution: 12
※ output channels: 4
※ Accuracy: ± 2 ‰
※ communication rate: 600 ~ 115200bps optional
※ output isolation protection, communication port optical isolation
※ Built-in watchdog
※ communication status indicators, self-diagnostic module status

PLC output modules

PLCProduct Code: 449482677
16 relay plc output module
※ Profibus dp communication, support a variety of configuration software,small plc system
※ 9.6Kbps ~ 6Mbps baud rate adaptive, under special circumstances can be customized 12Mbps
※ Output: 16 relay outputs
※ output circuit is electrically isolated from the communication loop
※ communication status indicators, self-diagnostic module status

Analog Output Module

DAM-3713 Product Code: 960326600
plc analog output module
※ Mitsubishi LINK RS-485 communication, support a variety of configuration software
※ digital output plc range: 0 ~ 20mA, 4 ~ 20mA
※ Resolution: 12
※ Accuracy: ± 2 ‰
※ communication rate: 600 ~ 115200bps optional
※ output isolation protection, communication port optical isolation
※ Built-in watchdog

PLC Analog Input Module

plc analog input module are a kind of analog PLC Input Module ofSeries PLC.  PLC Analog Input plc module is used to connect voltage and/or current sensors and RTD or thermocouple etc. It is divided into various types according to different signal types and connection modes. Its measuring precision is 16 digits with single-ended signal input. It supports hot plug. It's an intelligent module with self-diagnosis function, it can be automatically reset and restarted if operation failure appeared. It's unnecessary to set the hardware, intelligent plc will load parameters to it automatically after it being started.

PLC analog input module features:

1, collecting multi-channel plc analog input, industrial terminals, support rail mounting.
2,485 input interface connected to the computer, and 485 provide optical isolation.
3,plc analog input output module can be cascaded through 485, easy system expansion.
PLC analog input module technical parameters
1, the hardware configuration: 9 Road DI / PI, 8-way AI, 5-way DO, 3-way serial port.
2. Storage capacity: 4M.
3, Power supply: 10V ~ 30V DC.
4, the working environment: Temperature: -40 ~ + 85 ℃; Humidity: ≤95%.
5. Installation: panel mounted.
6, Dimension: 120x120x95mm.