What are the features of the PLC CPU

plc controller functions also continue to improve. With computer technology, signal processing technology, control technology continues to develop network technology and continuously improve customer demand, PLC increased the analog processing and motion control functions on the basis of the amount of processing on the switch. Today's PLC is no longer confined to logic controller, motion control, process control and other fields also play a very important role. As the product of choice of discrete control system, PLC in the 1980s and 1990s has been developing rapidly, PLC worldwide annual growth rate was maintained at 20% to 30%.

Different analysis plc cpu control and microprocessor controlled

 PLC is actually a set of ready microcontroller ( MCU wide range of oh ) system .

PLC ladder you can be understood as a compilation of calculators with the same language is a 

programming language , but a different range ! But common practice by the PLC ladder software to 

convert your C or assembly language ( used by the PLC the CPU determines ) , then use the assembler 

or  Nanda Plc controller manufacturers C compiler system compiled into machine code ! PLC is running 

just a few yards of it . ladder only allows users to more easily use it.

 Similarly the MCS-51 course also be used for making PLC , just eight CPU in some advanced 

applications such as: a large number of operations ( including floating point ) , embedded systems

 ( our equipment is slow, but the main logic control , but points many Oh , 128 I / O too ! ! ) , 

but also use ladder programming , we compile our ladder into KEIL C51 reuse of C51. you do not notice

 the choice of different models of the PLC the CPU you ! ! course, you can direct the development of 

single-chip control systems, but very demanding for the developer (not the general level capable of ) , 

long development cycles, high costs ( for some large decency you need to do a little experiment ,

 printing board requires a substantial amount of money , you can say you use  

Nanda china industrial automation plc  the simulator , using experimental board to develop, but 

I want to tell you , do you just verify the feasibility of the hardware and software , does not mean you

 can use in industry control systems, industrial control systems because the requirements are very high 

anti-interference , stable first , rather than the performance of the first , so you must constantly test the 

circuit board design , improvement ) when you solve these problems, you will find that you have to do 

with a PLC , of course, easy to use if you need someone to be able to use the software you'll need a set , 

so you may not need to tell others about your circuit ( you can not tell anyone ) .

What is the reason plc cpu modules

(1) We live with analog instruments, is the pressure, level, temperature and other signals into 1-5V ,

4-20mA ( there are other signals , such as 0-10V ,0-5V , etc. ) and then to the PLC processed .

2.PLC not know the size of the specific  Nanda Programmable Output Module voltage or current signal .

So, we use a number to indicate its size, then tell PLC, PLC in order to know the voltage and current 

signals input specifically how much.

For example , we measured the temperature is now 20 degrees ( range 0-50 degrees , the output range 

is 1-5V), a temperature sensor generates a voltage value at that time is (5-1) * 20/50 = 1.6V 

( instrument characteristics must be linear so it can be counted ) . After the PLC analog input module 

receives input of 1.6V , which will be converted into a digital value. For Nanda digital input module  

example , the resolution we are using the analog input module is 0-4000 of the corresponding 1-5V . Well 0,2.0V should correspond ( 4000-0 ) / ( 5-1 ) * 1.6 = 1600. That is , PLC , after reading the analog input 

module to its 1600 figures will be able to know it , from the temperature sensor to sensor temperature is 

20 degrees

What is the definition of cpu modules plc

A friend asked: What is the definition Will module power is?
Power module can be directly mounted on a printed circuit board power supply, because of the many advantages of a modular structure, and therefore is widely used in power switching device module, the access equipment, mobile communication, microwave communication, and optical transmission, routers, etc. communications and automotive electronics, aerospace and so on.
Advantage of the power module
Simple design. Just a cpu modules plc, accompanied by  industrial automation plc a small number of discrete components, you can get the power.
Power modules shorten the development cycle. Module power is generally a wide range of input and output options. Users can also repeat the superposition or cross superimposed to form a combination of modular power supplies, multi-channel input, output, greatly reduced prototype development time.
 Changes flexible. Product design To change, simply convert or another suitable power supply module can be connected in parallel.
 Technical requirements low. cpu modules plc generally equipped with a standardized front-end, highly integrated power modules and other components, so make power design easier.
 Shell has the plc modular  form module power structure collectors sink, radiator and shell Trinity achieve a module power conduction cooling, the temperature is close to the minimum value of the power supply. At the same time, it gives the power module packaging Jinyu their table.
High quality and reliable. Power modules are used in fully automated production in general, and with high-tech production technology, stable quality and reliable.
Versatile: module power can be widely used in aerospace, locomotive ships, military weapons, power generation and programmable logic control plc  distribution, telecommunications, metallurgy, mining, automatic control, household appliances, instrumentation and scientific experiments in various fields of social production and life, especially in the field of high technology and high reliability plays an irreplaceable role.

cpu modules plc three modules were introduced

Each of the three modules are described : ( a ) video capture module
Video capture module includes built video capture wireless transmission module , such as: wireless cameras. Responsible for monitoring live video capture and compression, transmission became available for digital signals , it is not necessarily fixed within a confined area , it can be placed in any 4G signal can be received at the mobile device . Need to integrate wireless camera lens , video compression cards, wireless Internet access modules and other equipment. Network remote monitoring center can determine the specific location of the video data according to numbers from the address of each wireless camera wireless Internet access module.
Wireless camera video data is very large , in order to transmit the cpu modules plc must be compressed . Select the  plc sequence of events recording module correct video compression standards to ensure clarity and transmission fluid. This is our system is an important factor in the design considerations . (B ) transmitting module
Network transmission module is responsible for transferring the video data channel , cpu modules plc Its role is to ensure a good transfer rate and delay level. In wireless video surveillance system , 4G technology can guarantee a good wireless transmission rate and delay requirements. Through the wireless transmission of video data goes into a wired  plc temperature module transmission channel. The wired transmission path includes the IP transfer network operator , service gateways , PDN gateways , Internet video monitoring center and reach the wired transmission channel. After the video data is transmitted through the network module, the video monitoring center can download the video data processing and storage. (C ) video monitoring module via Internet, Ethernet connectivity , video surveillance center can have multiple physical addresses , video monitoring center is responsible for video information storage, management , querying, and real-time monitoring tasks , including  Programmable Input Module video storage server management and monitoring server.
 The system has a data transfer rate is high, image transmission delays small , wide scope of monitoring , access to end-users and more features , suitable for most industrial users .

Process plc cpu modules and work characteristics

(A) analysis of the controlled object and made a detailed analysis of the controlled object to control the process and work characteristics, understand charged with the object of mechanical, electrical, fluid between the controlled object to the proposed control system PLC control requirements, to determine control scheme proposed design task. (B) determine the input / output control apparatus according to the system requirements, the plc sequence of events module  system determines all the required input devices (such as: buttons, position switch, switch, and various sensors) and output devices (such as: contactors, solenoid valves, , signal lights, and other actuators, etc.), in order to determine the relevant PLC input / output device to determine the PLC I / O points (three) Select PLC
 PLC PLC options include the choice of models, the capacity, I / O modules, power supplies, etc. (d) allocate I / O points and peripheral hardware design PLC line 1. Assign I / O points to draw the PLC I / O points and connection diagram or table correspondence between input / output devices, the part 2 can also be designed to draw the line PLC peripheral hardware rest of the system electrical circuit diagram in step 2, including the main circuit and did not enter the PLC control circuits, etc. . By the PLC's I / O connection diagram and PLC peripheral electrical circuit diagram of a system consisting of electrical schematics. Electrical wiring system hardware have been identified so far. (E) Program Design 1. Program design based on the control system requirements, the use of appropriate design approach to designing the PLC program. To control procedures in order to meet the system requirements of the main line, each writing achievement of the control functions of each sub-task or procedure, and gradually improve the system specified function. In  analog output module addition, the program should normally include the following 1) initialization routine. PLC after power on, usually do some initialization operation, to start to make the necessary preparations to avoid system malfunction. The main contents of the initialization process are: the certain data area, the counter is cleared, etc., some of the data required for recovery of the data area, the relay is set for some or reset, so some initial display state.
  2), such as testing, troubleshooting and display program. These procedures are relatively independent, generally when the program is completed and then add the basic design.
  3) Protection and chain procedures. Protection and chain is an indispensable part of the program, must be considered carefully. The control logic it can avoid the confusion caused by the illegal operation.
 2 simulation debugging program
 Process simulation debugging basic idea is to facilitate the simulation of the actual site in the form of state, to create the necessary conditions for an environment to run the program. Depending on the way to generate on-site signal simulation debugging hardware method and two forms of simulation software simulation.
 1) is to use some of the hardware simulation  plc input output modules hardware device (such as a PLC or some other use input device, etc.) the analog signals to generate a field, and these signals are hard-wired connection connected to the input of the PLC system, the timeliness than strong. 2) simulation software is written in another set in the PLC simulation program to simulate the live signal, which is simple, but not easy to ensure timeliness. Simulation debugging, debugging can be segmented approach, and use the programmer's monitoring function.

Some of the main exposition plc cpu modules modules

If there is an alarm relay on the meter, then set the alarm temperature on the instrument, the output relay is directly connected to the digital inputs plc and public clients. If there is no alarm relay on the  input module plc meter (meter is no such general alarm relay), direct access to analog values ​​plc to make their own alarm in the program. And direct access to the analog case plc, and because plc and instrumentation wiring different models differ, analog signal inputs can be 4-20mA, it can be 0 - (5) 10V, can also be thermal resistance and the like, the situation is more, the need for specific models can be. What is the installation of the module depends on the general  programmable logical controllers input and output modules are not installed the driver, but the Mitsubishi motion CPU modules need to install the driver and set up. General PLC run the installer to write a good program it. Not add a module plus a driver, such as AD / DA module, just write in the program on it. Some PLC is not with AI (analog input) and AO (analog output) function, but usually there with an expansion slot, or expansion socket for programmable logic controller  adding analog input and output functions, 32DI (32 个input module), 32DO (32 output ports module), if the PLC itself comes with input and output ports is not enough, you can add these modules to perform the functions specified pull.

Which calculation plc cpu modules ten modules

CPU has the basic functions of the following four areas:
1 This refers to the sequence control instruction execution order control program instructions. There is between each instruction in Nanda plc IO module  the program's strict order, the order must be in strict accordance with the procedural requirements of the execution, in order to ensure the correctness of the computer work.
2 the function of controlling the operation of an instruction executed by a computer is often a component in a sequence of actions to achieve. CPU according to these instructions, to produce the corresponding operation control signals sent to the corresponding components to  Nanda plc program logic controller control these components according to the requirements of directive action.
3 Time Control Time Control is the timing of the implementation of a variety of operating time. During the execution of an instruction, and at what time to do what action should be strictly controlled. Only in this way, the computer can automatically work methodically.
4 data encryption for data that arithmetic and Nanda plc input output modules  logical operations, or other information processing.