Major developments plc analog input modules

With the development of science and technology, the reliability of a redundant PLC system has been further improved, the current PLC redundancy can be divided into hardware redundancy and software redundancy in two ways, hardware redundancy connection differently, but also requires that the corresponding hardware model, but no special software is required. Because of the higher hardware redundancy with high reliability, but also higher cost to build the system. And software redundancy is a low cost solution while also greatly  plc cpu module improved the reliability of space applications, plc analog input modules can be widely used in metallurgy, transportation, electricity, chemicals, sewage treatment, etc., but the system still needs to be Research. Here's a brief introduction to the way these two redundant PLC system.
Software redundancy principle is that when the process of the realization of the two CPU while the system is running up and running, but in normal operation only the main CPU to issue control commands, and the standby CPU to detect and record the main CPU status issued by the main CPU command, plc analog input When the main CPU modules can be sustained at the time  plc analog output module of the failure of the state to take over the main CPU to issue actually execute the command. When specific fault occurs, the system can achieve standby switch, standby master station continues to run to succeed.
Hardware redundancy redundant system to ensure reliability of the system, such as all the major components are redundant configurations, including a redundant CPU, power supply module and the synchronization module for redundant CPU communication. Customers can also be configured accordingly redundant servers, redundant interface module, redundant communications media, etc. according to specific needs. Under normal circumstances high-speed counter modules  hardware redundancy system can achieve the following functions.
A positioning error detection and error integration.
2 automatic event synchronization with smooth master-slave switch.
3 is similar to a standard CPU-line programming.
4 can be modified during operation of the system or components to be replaced.
5 Download the program when considering only a single CPU, the program can automatically copied to another CPU, and the automatic re-enter after the repair.

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 in the AC / DC conversion simple analysis

AC / DC conversion is to convert AC to DC , the power flow may be bidirectional power flow from the power source to the load is called a " rectifier " power flow from the load to return the power referred to as " active inverter ." AC / DC converter input is AC 50/60Hz , because to be  industrial automation plc rectified , filtered , and therefore relatively large size of the filter capacitor is essential, because while experiencing safety standards (such as UL, CCEE , etc. ) and EMC Directive restrictions ( such as IEC,, FCC, CSA), AC input side EMC filter must be added to meet safety standards and the use of components , thus limiting AC / DC power supply volume of miniaturization, in addition , due to the internal high-frequency , high-voltage , large plc module  current switching action, making solve EMC problems more difficult , plc analog output modules also installed on the internal high -density circuit design made ​​high demands, for the same reason , high voltage, high current switching power supply makes the job losses increase large , plc analog output modules limits the AC / DC converter modular process, and therefore must be used to optimize power system design approach to make it work efficiently to achieve a certain level of satisfaction .
AC / DC conversion circuit according to the  plc programmable intelligent controller connection method can be divided into half-wave circuit, a full-wave circuit . Press the power phases can be divided into single-phase , three-phase , multi-phase . Operation of the circuit can be divided into quadrants by a quadrant , two quadrant , three quadrants, four quadrants.

plc analog input modules of the main features of some other

In the industrial production process, a large amount of sequence control switch, which follow a logical sequence of actions conditions and controlled chain protection action in accordance with the logic, and a large number of discrete data collection. Traditionally, these functions plc communication modules  are controlled by pneumatic or electrical system to achieve the second year, based on the control unit integrated circuits and electronic technology, for the first time using procedural methods used in electrical control, this is the first generation of programmable logic controller , called Programmable ontroller (PC). After a personal computer (the PC) to develop, for convenience, but also to reflect the features of programmable controllers, programmable logic controller named Programmable Logic Controller (PLC).
Growth rate has been maintained at 30 to 40%. During this period, PLC analog processing capacity, number-crunching, man-machine  plc sequence of events recording module interface capabilities and network capacity has been greatly improved, PLC gradually entering the field of process control, replaced in some applications in the field of process control in a dominant DCS systems. PLC has the versatility, ease of use, wide adaptation, high reliability, strong anti-jamming capability, programming and simple. PLC in the industrial automation and control especially in order to control the position, in the foreseeable future, can not be replaced.

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.

plc analog input modules connected to 4G FAQ

The next Windows environment: an installation module antenna connected, plug in China Mobile 4G USIM card;
2 the other end of the USB cable into the computer's USB port, turn on the power switch, when lit, representatives have power. This plc program logic controller  time the computer will prompt the discovery of new hardware when the PC driver is not installed, see the "Device Manager" in the "Other Devices", you can see a yellow question mark ports;
3.plc analog input modules driven double-click driver installation, the driver is installed, the "Device Manager" in the "Port" column can be seen out of the virtual serial port;
4 After installing the driver, you can open the programmable logic control plc  serial port testing tool, select "Connect - open the serial port" drop-down list to select any one of the serial port can be tested;
5.plc analog input modules input "AT + CFUN = 1", press the Enter key, this instruction is the role of software boot correctly returns "+ CEREG: 1" indicates a successful boot;
6 Enter the "AT ^ DSTMEX = 1,7", press the Enter key, the role of this instruction is to set up a network of only 4G network registration, return "OK" indicates the setting is successful;
7 Enter "? AT + COPS", press the Enter key, the plc programmable controller  role of this instruction is to query the network registration status, when the return "+ COPS: 0,0," CHINA MOBILE ", 7", said registered to the 4G network;
8 Enter "AT + CGDATA =" M-0000 ", 1", press the Enter key, the role of the directive is to activate data services, when the return "CONNECT" after the description has been successfully activated 4G network, then your pc machine you can access it.

plc analog input modules which modules are composed mainly of

When deposited from the programming input to the user program memory and CPU system according to the function given by (system program memory compiler interpretation), translating into an internal PLC user program recognized by the users compiler.
Wang: plc analog input modules input state and input information from the input interface input, CPU will be credited to the work  industrial automation plc of the input image data memory or register. Then the data from the CPU and procedures together organically. The result is stored in the output image register or working data memory, and then output to the output interface, control external drive.
Composition: CPU by the controller, operator and register. These circuits are integrated on a single chip. CPU through the address bus, data bus and I / O interface circuit is connected. Semiconductor memory circuit with memory function. Into the system program memory and user memory.
System program memory to store the system procedures, including management procedures, monitoring programs, and to explain to the user program to do the compiler to compile process. Read only memory, ROM components. Manufacturers use the content can not be changed, power does not disappear.
User memory: User program memory is divided into data storage and work area. A random access memory (RAM) components. User. Power content disappears. Common efficient lithium batteries as a backup power plc intelligent controller  source, life is generally 3-5 years. Input / output interface
(1) plc analog input modules input interface: optocoupler consists of two LED and phototransistor extreme tube components.
LEDs: at the input of the optocoupler changes with an electrical signal, the light emitting diodes generates the same variation of the input signal is an optical signal.
Optical three tubes: In conducting the irradiation light signal, and the degree of conduction on the strength of the optical signal. In the linear operating region optocoupler output signal and the input signal has a linear relationship.
Input interface circuit works: When the switch is closed, plc analog input modules emitting diodes, and transistors under  plc controller manufacturer irradiation of light is turned on, the internal circuitry of the input signal. When the switch is off, the diode does not light, the transistor is not conducting. The input signal to the internal circuit. That is, through the input interface circuit of the external switching signal into the PLC can accept digital signals. (2) operation of a relay output circuit outputs the PLC: when the internal circuit outputs a digital signal, a current flows through the relay coil current, and the normally open contact is closed, the load is turned on to provide current and voltage. When the internal circuit outputs a digital signal 0, no current flows through the relay coil without current, and the normally open contacts open, the load current or voltage is off. That is, through the output interface circuit into the internal digital circuitry, or a signaling operation of the load does not operate.

some introductory plc analog input modules supply identified

plc analog input modules is not equal to the number of inductive power supply circuit relative to the number depends on the power supply circuit with the corresponding control chip , like a lot of looks like a 6 or 8-phase loop powered with eight large inductor placed there , in fact, really 4 +2 or 4 +4 phase .
As for the seemingly Bluff actually do not plc programmable controller  practice special programs , because it's like hyper-threading as other conditions , like dual nuclear power plant thread certainly not four nuclear power plant thread is strong, but plc analog input modules will be stronger than the dual-core double thread ; same 4 +4 phase power but not as authentic eight- phase loop will come stronger than pure four-phase circuits.
As to why there will be " inductive loop number is  programmable plc the number of power " such a statement, in fact, is not high because the previous CPU -power motherboard power supply circuit is really so little time , but is now coming out of the 24 -phase power supply board , if you really 24 -phase power supply in accordance with the purely physical , and that as a direct digital powering up.
Now the number is three or four inductors can be judged as a three-phase or four-phase loop-powered , but if eight or even double plc sequence of events module  digits , then the official website or directly query the data more reliable .
To answer your case, right is left is the memory expansion slot , 3-phase power supply should not run. But see how many MOSFET , watching looks like a two -phase loop one last look MOSFET, this circuit withstand the current pressure is not recommended or not considered a high- power processor .

plc analog io modules and how to convert digital

The concept is relative to the analog digital (switch) is, the digital signal is a signal that the signal is only two states 0 and 1, such as our trip switch button.
Is a discrete analog signals, plc analog io modules Analog data within a certain range, Ken can be any value, such as pressure, temperature, flow rate can be either a voltage can be 0.1 0.12 etc. When we deal plc sequence of events module  with such signals, with analog modules! Equipment such as temperature and humidity into analog signals need to use analog modules, analog module includes voltage, current, RTD, thermocouple module may cause the input signal voltage value of less, depending on your 0 - 10v with a  Programmable Input Module load capacity of how kind, because this time the input impedance of 250 ohms, then the maximum current can reach 40MA, the voltage signals are generally not such a big load capacity, in fact, the current input is converted to 4-20ma to 1 - 5v voltage before making A / D conversion. If the 0-10v enough to do with a load capacity may exceed the input limit, unless your plc modules are set in accordance with 0-10. Here is not required for transformation, when entering plc analog input module via analog, through conversion (programming calculation), the corresponding temperature value, then according to pulse input module plc  your set of 100 degrees Celsius to compare the size (programming), when greater than 100 degrees, plc control output IO module enables equipment downtime too, of course, out of the signal may be digital. Because just a simple switch, very simple.