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 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 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 .

What is a PLC module?

PLC module is the functional unit of the plc analog output module were made as the building blocks of modules that can be combined as needed to accommodate a variety of needs, commonly used power supply module, CPU module, digital input modules, digital output modules, analog input modules, analog output modules, high-speed counter plc output module, communication module, digital input and output modules, analog input and output modules, Where there are a variety of specifications for each model. May need to be combined in accordance.

What is the analog input module?

plc analog input module is a remote site analog signal acquisition device to the computer, which utilizes RS-485 bus as a data communication lines, providing analog to 485 function, can simultaneously eight analog input to the module, and by RS-485 bus transfer to the computer. Thanks to RS-485 interface as a communication interface, which can be a combination of multiple plc modules analog signal transmission more large ones, and can be dispersed in a 485 line, using the address code to distinguish, can directly access the MODBUS RTU protocol configuration software.
Analog is any value within a certain range of continuous change, with a state is antithetical to the digital representation. Typically used for analog capture and presentation of things, such as voltage and current, or frequency parameters. The analog input module is a possible acquisition of analog (such as voltage, current, thermocouple, RTD, temperature and other values) is transmitted to a computer via a smart module 485. The communication protocol uses MODBUS RTU protocol, and industrial data acquisition to achieve a unified docking program is also very convenient.

plc analog io modules is a remote site analog signal acquisition to the computer equipment

plc analog io modules is a remote site analog signal acquisition to the computer equipment, its use as a data communications bus lines, providing analog transfer function, can simultaneously eight plc analog input module to the module and bus transfer to the computer . As a result of the interface as a communication interface capable of multiple modules combination of plc analog input signal transmission more large ones, and can disperse the line configuration, using the address codes to distinguish, you can directly access protocol configuration software.

plc analog io modules management techniques

Reduce the demand for efficient power people and the size of electronic products, promote the development of digital power technology and power management technology. Modern power management semiconductors have been more associated with the power switch control circuit protection and integrated, plc analog io modules to reduce power management devices in the  digital input plc circuit board footprint and achieve the protection, control and fault monitoring functions combinations. Evolving the same time, digital power management ICs satisfied only detected voltage, current, temperature and other parameters, and gradually developed into an integrated digital PWM control, ADC and communication functions, and is moving towards becoming a complete power system on chip direction .
A digital plc analog io modules and  output module plc application management technology introduction
Generation IC requires 3.3 V, 1.8 V or lower supply voltage, the device requires multiple single voltage supply and the demand for a large electric current, the voltage must be applied to the device with the correct timing. Voltage power supply for these devices must be on the circuit board (preferably from these devices near the place) to produce, so that a minimum pressure drop and voltage stability. High-performance DC / DC converters for a wide range of input, either as isolated power, but also as a non-isolated point of load converters. Thus, most board power supply system has been high-speed counter plc  used DC / DC converter as a power supply module body. However, if the lack of power management circuits, you can not build a complete, robust power system. Content includes power management: Power system monitoring, sequencing and tracking, monitoring and fail-safe. Power management devices at the input common-mode rejection handling, start limit, starting and control off, and even power factor correction and other functions. Configuration at the output of the power management device control startup sequencing and output voltage regulation, and for the over-voltage, over-current conditions fail to provide appropriate protection. All relevant requirements and functional circuits are isolated from the main circuit.

plc analog input modules functional parameter index and test methods

Electrical performance of the power module is presented through a series of tests , the following general functional test project , as detailed below :
First, the definition of the power supply regulation regulation of its ability to provide a stable output voltage when the input power supply voltage variations. Test procedure is as follows : the power supply in the test engine after heat stable under normal input voltage and load conditions , respectively, in a low input voltage (Min), the normal input voltage (Normal), and high input voltage (Max) and record the measured The output voltage value. Power adjustment rate is usually fixed to a normal load (Nominal Load) , the percentage change caused by the input voltage output voltage deviation  micro smart plc (deviation) , as shown in the following formula : Define two , load regulation Load regulation is switching power supply when the output load current changes, its ability to provide a stable output voltage . Test procedure is as follows : plc analog input modules in the power supply to the test input voltage under normal load conditions and the stability of the heat engine , the measured value of the normal output voltage under load , and then were light load (Min), overload (Max) Load Next , measure and record the output voltage value ( respectively Vo (max) and Vo (min)), load regulation is usually normal fixed input voltage, load current changes caused by the output voltage deviation rate percentage , as the following equation: Third , the definition of a comprehensive regulation for the comprehensive regulation of the power supply to the input voltage and output load current changes, its ability to provide a stable output voltage . This is a comprehensive line regulation and load regulation , and this test system for the synthesis power regulation and load regulation , which provides for the power supply to changes in input voltage and load conditions more accurate performance verification . Comprehensive regulation in  industrial automation plc the following ways: on input voltage and output load current changes , the output voltage deviation shall be within the range specified above the lower voltage ( ie, less than the absolute value of the output voltage above the lower limit ) or as a percentage of the boundaries four , plc analog input modules output noise output noise (PARD) refers to the input voltage and output load current are constant , periodic and random deviation of the average DC output voltage of the voltage. Output noise is after all the unwanted part exchanges and noise on the regulator and filtered DC output voltage ( 50/60Hz power frequency signal containing the low-frequency , high frequency above 20 KHz switching signal and its harmonic wave, and then the other of the  plc analog io module composition and the random signal ) ) , usually mVp-p is a peak-to -peak voltage is expressed in units . General specifications are output switching power supply DC output voltage of less than 1% of output noise specification , the bandwidth of 20Hz to 20MHz. The actual work when the power is the worst situation ( such as maximum output load current , input supply voltage minimum , etc. )

plc analog output modules has a broad development

At present, the development of embedded PLC is also diversified , domestic core a few years ago there Huazhong Science and Technology chipset embedded PLC system software is loaded , as the hardware platform , the plc input output modules  development of multi-mode embedded PLC into the channel ; there is a development path is the development of PLC and HMI combination of hardware / software integration for the target platform , taking advantage of CASE tools, combined with various types of embedded chip development platform and a variety of input / output channel hardware circuit libraries, designed  for electrical and mechanical equipment developed customized, ODM nature has dedicated PLC.
Embedded PLC has a broader space for development in our country , plc analog output modules first is that it is very beneficial to the development of China's two major characteristics play automation plc modular  industry : There is a very strong market for the electrical and mechanical equipment for the foundation , and has enough value for money the world's best design and development team . We can at the lowest cost , high quality, according to custom requirements of the design , production and electromechanical equipment for embedded PLC, instead of the generic PLC. Meanwhile, the various aspects of functional embedded PLC hardware , software, human-machine interface , communications, design flexible, easy to cut , closer to the requirements of modular plc  various grades of electrical and mechanical equipment . Embedded PLC technology based entirely on the basis of embedded systems can be used with . SoC chip , embedded operating systems and programming languages ​​according to IEC 61131-3 standard programming environment and other advantages, making it very easy to find on the market

situation plc cpu modules plc rapid development in the international grim

The degree of automation of industrial enterprises is generally low, such as machinery industry for more than 80% of the programmable logic controller  equipment is still using the traditional relay and contactor control. After joining wto Copyright Control Engineering, China is becoming the world's new manufacturing base, mainly in manufacturing control logic control-oriented, a lot of automated transformation of traditional industries also provide a broad space for development plc applications. = Rapid growth of China's manufacturing growth rates in some sectors even reach 20%. Over the next five years, the annual growth rate China plc market is expected to reach 14.1%. 2003 this market was $ 370 million.
Due to various reasons, the domestic brands in the plc analog input output module  domestic plc plc small proportion of the market share, has not  formed industrial scale, China is now on the market for more than 95% of the plc products from foreign companies. From a technical perspective, small plc is narrowing the gap between home and abroad. Decades of international manufacturers face large-scale production and marketing management experience Copyright Control Engineering, the majority of domestic manufacturers and only stay in small batches to maintain the survival of infancy, from  plc input output modules the real mass market operations as well as to create a brand as well as a long way to go.

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.