What is the main role of PLC communication module is

communication modules plc has a wide variety of purposes, but the main effect is the IPC host or master-slave control is established between the touch screen and downstream equipment. To choose what kind of communication module to see what you control, or what is going to a conversation. But you said the monitor is not connected thereto communication, because communication module plc is taking MODBUS or DP and industrial agreements. Monitor signal only VGA signal. So the two can not be mixed together.

plc's cpu running program

Indicating step program memory address counter inside the PLC CPU, the program is running, the step of the counter is automatically incremented for each execution, the program from starting step (step number zero) sequentially perform the final step (typically END instruction), and then return to the starting step cycle operation. The time required for one cycle of operation is completed for each PLC is called a sweep. Different types of plc module, cycle scanning period between 1 microsecond to tens of microseconds. PLC Ladder programming logic in solving aspect, showing the advantages of fast, in microseconds, logic solver 1K less than 1 millisecond. It all inputs are processed as a switch, 16 (there are 32) is an analog. Large PLC using another CPU to perform analog operations. The calculated results to the PLC controller. The same plc IO module system, with PLC than with the DCS, the cost is lower (about can save about 40%).

plc pace of development in the future

With increasing degree of factory automation and china plc market expanding capacity base, the growth rate in recent years PLC in industrial countries slowed. However, growth in China and other developing very rapidly PLC. Comprehensive relevant information, in 2004 global sales of PLC is about $ 10 billion, in the field of automation occupies a very important position.module plc is a touch imitation of the original relay control principle developed, in the 1970s the PLC only switch logic controller, the first application in the automotive manufacturing industry. It is stored in the implementation of logical, sequential control, timing, counting and arithmetic instructions such operations; and through digital input and output operations to control various types of machinery or production processes.

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%.

Reason thermostat module

In recent years, the rapid development of computer technology has been widely applied in all walks of life. However, with the corresponding traditional industrial module plc development cycle is long, repeated use is low, the price is high, difficult to modify and other shortcomings. As more and more automation equipment has been applied, it is for industrial control software is also rising, the traditional industrial control software has been unable to meet user requirements. How convenient use of the software to design flexible and efficient plc temperature module system has become a very important issue.

In the PLC, CPU module, I / O modules, namely what role

CPU module is the control center of the PLC. It functions in accordance with the procedures given PLC system receives and stores from the programmer type of user programs and data; check the power supply, memory, I / O and watchdog timer status, and diagnose user program syntax error. plc IO module is the interface between PLC and site control interface input channels. Therefore, the manufacturer of the PLC power supply design and manufacturing very seriously. Programming plays a role in the design and commissioning of the plc.

Advantages PLC NA series

NA Series Programmable Logic Controller (NA Series PLC) is a new generation controlling device developed with international advanced level. programmable intelligent controller adopts a series of latest achievements in the field of industrial controlling, selects a brand-new hardware and software platform, so it has fast processing capacity, strong anti-jamming performance, flexible extensible function, and plc module could cope with any complex environment and processing requirements easily and skillfully. NA Series PLC has got CE Certification and FCC Certification, various performance indexes have reached or exceeded relevant standards and are ahead of similar products.

further improve the reliability of the PLC

n order to further improve the reliability of the PLC, for large-scale PLC also uses dual-cpu module constitute a redundant system, or the use of three CPU of voting systems. Thus, even if a cpu modules plc fails, the whole system is still running.
CPU speed and memory capacity are important parameters for PLC, which determines the operating speed of the PLC, I / O number and software capacity, etc., thereby limiting the size of the control.

PlC of cpu module

plc cpu modules is the control center PLC is the core of the PLC from the nerve center of the action, each PLC has at least one CPU. It functions in accordance with the procedures given PLC system receives and stores from the programmer type of user programs and data; check the power supply, memory, I / O and watchdog timer status, and diagnose user program syntax error. When the PLC into operation, the first of its way to scan each site receiving state and data input device, and are stored in the I / O image area, then one by one to read the user program from the user program memory, after the command interpreter Press the results of the implementation of the provisions of the instruction of a logical or arithmetic fed into the I / O image area or a data register. And so after all of the user program is finished, the final transfer of data I / O image area of each output state or output register to the appropriate output device, so the cycle run until it stops running.

What is the definition of PLC, programmable logic controller

Programmable logic controller, said the English Programmable Controller, called PC. However, due to the personal computer PC is easy and (Personal Computer) confused, so people are still accustomed to using plc communication modules as an abbreviation. Electronic digital computing device operating system, it is a microprocessor core, specifically designed for applications in the industrial field, for it uses programmable memory for storage in its internal implementation of logical, sequential control, timer / counting and arithmetic operations such as operating instructions, and digital or analog input through output interface, control of all types of machinery or production processes. PLC is the product of computer technology with traditional relay contactor control technology, which overcomes the wiring relay contactor control system complex mechanical contact, low reliability, high power, versatility and flexibility shortcomings of the poor, full advantage of the microprocessor, and take care of operation and maintenance personnel to the site electrical skills and habits, especially PLC programming does not require specialized knowledge of computer programming languages, but with a set of relay ladder based simple instruction form, so that the image of the user programming, intuitive and easy to learn; debugging and troubleshooting is also very convenient. After the user to purchase the desired PLC, just follow the prompts manual, do a small amount of wiring and easy user programming work, it can flexibly and easily be applied to production practice PLC.

Programmable Logic Controller (PLC) features

Industrial control equipment reliability requirements:
① MTBF long time
② time to repair (MTTR) Short
Any failure electronic devices, usually two:
① sporadic fault. Due to the harsh external environment, such as electromagnetic interference, ultra-high temperature, ultra-low temperature, over voltage, under voltage failure caused by vibration and so on. Such failures, they do not cause damage to system components, once the environmental conditions return to normal, the system also will return to normal. But for PLC, the rear outside influence, the information stored inside may be damaged.
② permanent failure. Since the components can not be restored and the destruction caused by the fault.
If we can limit the occurrence of sporadic fault condition, the consequences will not be affected if the PLC or able to make impact in harsh environments is limited to a minimum, make programmable logic controller (plc) suppliers automatically disappear after the harsh conditions return to normal, so that we can improve MTBF time; if we can increase the number of diagnostic measures and appropriate means of protection in the PLC, when a permanent failure, can quickly find the point of failure and faults locally, can reduce mean time to repair the PLC. To this end, each PLC manufacturer has taken various measures in terms of hardware and software, so that PLC in addition to their strong self-diagnostic capabilities, in time with an error message, stop waiting for repair, but also make the PLC has a very strong anti-jamming capability.

Micro & Nano programmable control system

Our micro and nano-PLC can provide an economical solution to meet the basic needs of a simple mechanical control, including relay replacement, and simple control timing and logic. The controller uses a compact package, integrated plc IO module and communication, and easy to use, ideal for conveyor automation, security systems and building and parking lot lighting applications projects.

PLC basic instruction Overview

FX series Plc logic controllers basic logic instructions 20 or 27, stepping instruction 2, features more than 100 instructions (different series vary).
FX2N plc temperature control module  a total of 27 basic logic instructions, which contains 20 basic logic instructions some sub-series plc input output modules.
Instruction fetch and output instruction (LD / LDI / LDP / LDF / OUT)
(1) LD (instruction fetch) a normally open contact and left instruction bus connection, a normally open contact each logical row starting with this directive.
(2) LDI (negated instruction) a normally closed contact and left the bus connection instruction, a normally closed contact each logical row starting with this directive.
(3) LDP (transition instruction fetch) normally open contact with the left leading edge detection instruction bus connected only at the rising edge of the specified bit device is turned on when a scan cycle (from the OFF → ON).
(4) LDF (falling instruction fetch) normally closed contacts of falling edge detection instruction and left the bus connection.
(5) OUT (output command) coil for driving instruction, also known as output instruction.

Programmable Logic Controller (PLC) of the workload of the design and

construction of the control system
Since the digital output plc using a relay control system software to replace a large number of intermediate relay, time relays, counters and other devices, the control cabinet design and installation of wiring workload greatly reduced. Meanwhile, plc controller manufacturer user program can simulate debugging in laboratory, but also reduce the workload of site commissioning. Also, due to the low failure rate micro smart plc and strong monitoring, modular, etc., so maintenance is also very convenient.

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 cpu modules's internal information. Once the fault condition is removed, you can return to normal, continue the original program of work. Therefore, intelligent 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 modules 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.

Programmable Logic Controller (PLC) hardware measures:

The main modules are used large-scale or large scale integrated circuits, a large number of switching operations performed by non-contact electronic memory, I / O system design have improved the channel protection and signal conditioning circuit.
① shield - to power transformers, CPU, programmers and other major components, the use of electrical conductivity, magnetic shielding material good, to prevent outside interference.
② filter - the power supply system and an input line filter in various forms, such as LC or π-type filter network to eliminate or suppress high frequency interference, but also weakened the interaction between the various modules.
③ power adjustment and protection - the core components of the microprocessor needed a + 5V supply, the use of multi-stage filter and make adjustments with the integrated voltage regulator to adapt to fluctuations in the exchange and over-grid voltage, under influence of voltage.
④ isolation - between the microprocessor and plc IO module circuits, opto-isolated, effectively isolate the electrical connection between the I / O interface with the CPU contact, reducing failures and malfunctions; between the I / O port also isolated from each other.
⑤ with modular structure - This structure helps in case of failure to repair short. Once identified a faulty module can easily be replaced quickly, allowing the system to resume normal work; also helps to accelerate find the cause of the fault.

Programmable Logic Controller (PLC) features

Industrial control equipment reliability requirements:
① MTBF long time
② time to repair (MTTR) Short
Any failure electronic devices, usually two:
① sporadic fault. Due to the harsh external environment, such as electromagnetic interference, ultra-high temperature, ultra-low temperature, over voltage, under voltage failure caused by vibration and so on. Such failures, they do not cause damage to system components, once the environmental conditions return to normal, the system also will return to normal. But for plc analog input output module, the rear outside influence, the information stored inside may be damaged.
② permanent failure. Since the components can not be restored and the destruction caused by the fault.
If we can limit the occurrence of sporadic fault condition, the consequences will not be affected if the plc IO module or able to make impact in harsh environments is limited to a minimum, make PLC automatically disappear after the harsh conditions return to normal, so that we can improve MTBF time; if we can increase the number of diagnostic measures and appropriate means of protection in the PLC, when a permanent failure, can quickly find the point of failure and faults locally, can reduce mean time to repair the plc communication modules. To this end, each PLC manufacturer has taken various measures in terms of hardware and software, so that PLC in addition to their strong self-diagnostic capabilities, in time with an error message, stop waiting for repair, but also make the PLC has a very strong anti-jamming capability.

CPU module key switch description

CPU module key switch description

RUN running mode and REM remote mode

Run the CPU, the user cannot be stopped by software; cannot modify the program, including a full download and online download, not mandatory, cpu modules plc programming software can not write variables (HMI can write variables); can not be reset, cold reduction and empty application.

From the "run" or "PRG mode dial to" REM "mode, CPU working mode to maintain the state, users can through software running or stopping CPU;  digital output plc can modify the program online, can force, you can also write variables can be reset, cold reduction and empty applications.

Sinoplc CPU module structure

Sinoplc large PLC with advanced computer technology, control technology, communication technology and signal processing technology, can provide personalized solutions for users of different industrial sectors for logic
control, sequential control, micro smart plc process control, drive control and motion control and other fields.

Applications include electric power, petrochemical, chemical, metallurgy, energy, transportation, municipal, textile, food, paper, printing, pharmaceutical, mining, intelligent buildings, cpu modules plc air conditioning and refrigeration.


Provide LED lights, key switch, RS232 interfaces, digital output plc  RS485 interfaces, PROFIBUS-DP bus interface, Ethernet interface, SD memory card slot and a spare battery slot on the CPU module panel.

Compared with traditonal PLC,sinoplc large PLC

Sinoplc large-scale programmable controller (PLC, cpu modules plc ) Hollysys in summing up the control system design of fifteen years and thousands of sets of project implementation experience based on the launch of application in the field of medium and high performance control products.

Compared with the traditional PLC, LK can be programmable controller with full integration of the advantages of DCS and PLC, the high performance analog processing technology, miniaturization structure design, open, industry standard, universal system platform, small plc make the product not only has the powerful function and excellent performance, but also has higher reliability, better openness and ease of use.

The development of sinoplc large cpu modules plc

In the development process of sinoplc large PLC, Hollysys fully consider the users of the system security, performance, structure, applicability, and interface of the demand expansion, cpu modules plc efforts to build the system has the characteristics of high performance, high reliability, novel design, easy to use, open and flexible, can bring many benefits to the user.

Use sinoplc large PLC, you can not only solutions based on the flexibility to customize the site actual demand, perfect to realize the control target, to reduce operating costs, input module plc improve work efficiency and system redundancy schemes, compact structure, humanized design can to you thought, do you seek, make you relaxed freely, anytime, anywhere enjoying the joy of working!

The system control center, PLC CPU module

The CPU module is the control center of the system, the user will be prepared to complete the program is downloaded to the CPU module, the CPU module after the start of a cycle of user program execution, each cycle should be read into the process information, cpu modules plc  logic calculation, output calculation results, but also the timing or by user set time, high-speed counting, event processing and communication interrupt process.

The powerful LK PLC, is the first large-scale programmable controller, system
implementation experience based on Hollysys company has accumulated fifteen years of research, high-speed counter modules development and engineering control system, in-depth study and absorb the essence of the international similar products, PLC years of intensive and meticulous farming.

PLC from the basic to let you know it,plc cpu modules

PLC is a programmable logic controller, mainly used for the logic control, which is composed of a host and an input / output unit. The input and output is the main switch signal, programmable logic controller manufacturer has now developed a simulation signal; the main principle is to accept the input signal to the controller, according to certain logical relationship, the operation on the controller, and the output to the output unit.

In the user view, a detailed analysis of the internal circuit of CPU is not necessary, but the working mechanism of the various parts or should have the enough understanding. Control the CPU controller CPU, plc digital input module  ,explaining and executing command which reads the instruction.

Plc cpu

Since the 1960s, the United States launched a programmable logic controller (Programmable Logic Controller, PLC) to replace the traditional relay control system, PLC has been rapid development,cpu module plc has been widely used around the world. Meanwhile, the function of the PLC is also improved. With computer technology, signal processing technology, control technology continues to develop network technology and the continuous improvement of user requirements, PLC increased the analog processing and motion control functions on the basis of the amount of processing on the switch. Today's modular plc is no longer limited logic control, motion control, process control and other fields also play a very important role.
Programmable logic controllers initially only logic control circuit function, so was named the programmable logic controller, and later with the continuous development of these original features simple computer module already includes logic control, timing control, analog control Many of the features, such as multi-machine communication, the name was changed to the PLC (Programmable Controller), but because plc cpu modules is also shorthand for PC and PC (Personal Computer) shorthand for conflict, but also as a result of many years of usage, people or programmable logic controllers often use this title, and the term is still used in the acronym PLC.

Cpu modules plc

plc cpu module having a microprocessor digital electronic devices for digital logic controller automation and control, control commands can be loaded at any time within the memory storage and execution. By an internal programmable controller CPU, instruction and data memory, input and output units, power modules, modular plc, combined into a modular unit.
Widely used in the current field of industrial control. Prior to the programmable logic controller appears generally to be used hundreds of relays and automation systems in order to form a counter with the same functionality, but now, after the programming of simple programmable logic controller module has basically replaced these large devices. programmable plc controller system program is generally at the factory initialization is complete, users can edit their own according to their own needs appropriate user program to meet different requirements for automated production.

Plc cpu modules

module plc is the control center of the system, users will be prepared to complete the program is downloaded to the CPU module, plc cpu module starts execution of the user program in a circular manner, each cycle should be read into the process information, logical calculations, the output result of the operation, but also the timing set by the user or the time to deal with communications, high-speed counting, event interrupts the process.
PLC control system, Programmable Logic Controller, programmable logic controllers, a digital computing operation of electronic systems, designed for use in industrial environments and design. cpu modules plcuses a programmable memory for its internal storage procedures, the implementation of logical, sequential control, timing, user-oriented counting and arithmetic operations such instruction, and through digital or analog input / output control of various types of machinery or the production process. Is the core of industrial control.

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 , 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

plc cpu machine control technologies more economic sense

Vertical machines require a higher degree of automation is a mechanical and electrical equipment , generally used in the  Nanda Plc logic controllers metallurgical industry , car manufacturing all kinds of large workpieces ; it usually uses electronic control system failure rate relay logic control, equipment , long maintenance cycle . With the advancement of technology, this type of control system has shown a growing number of drawbacks. In recent years, PLC automatic control machines in industrial applications more widely , it is out of the control of the comprehensive advantages in performance , group, machine cycles and hardware costs and other aspects of the performance of other industrial products are difficult to compare . If PLC control technology for these systems to implement reform , the universal technical and economic significance.
    Choose a plan
    Original equipment for manual operation , according to the department's recommendation to maintain the transformation of the Nanda Plc controller manufacturers  former equipment man-machine interface in the transformation of the original program , which can effectively reduce the misuse of equipment personnel , the equipment does not cause the accident rate in the post- transformation increased.
Workbench transmission system relies on hydraulic unit solenoid valve to achieve, constantly changing the transmission ratio by mechanical transmission components , to achieve the purpose of changing the speed of the table . Its variable speed operation is quite complicated , we must let the host parking , selected speed , micro gear back together again Guadang bite , and finally restart. According to the site load calculation and theoretical analysis, the way to retain the main drag .

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 ) .

Some problems plc cpu modules of

Drive in function provides a variety of fieldbus communication module , is ideal for system integration applications , parking facilities and remote monitoring applications ; built-in PLC function can Nanda plc controller suppliers  replace the small single-chip controllers, counters and timers , thereby significantly reduce system cost , which is very suitable for price-sensitive machining industry ; adopts European design , can hang side by side rails can be added back , compact body type can be significant savings in installation space ;
Meanwhile, the products do parallel DC bus powered , energy efficient mutual feedback absorbed , distributed braking resistor burden , and more than one use the same brake module , greatly reducing the Nanda plc digital input  system cost ; fully comply with export requirements.
In addition, the product can also be convenient and flexible range of optional accessories , such as I / O card , A / D, D / A module, digital operator , PG card , communication module, the customer may need a reasonable configuration , allowing the system to achieve best value for money ; perfect protection , high accuracy current sensing , are the highlights of its functions .
Drive only in product features, performance and  Nanda plc input output modules control technology are always inherited the advantages of automation Delta family , but also in the application point of view , a flexible modular design, environmental protection and energy saving aspects of innovation . But even more noteworthy is that , VFD-E series inverter built a powerful PLC 's

Full servo warp knitting machine mechanical structure and working principle plc cpu modules control

 The traditional textile industry processes , including fibers, weaving, finishing and garment four parts. Weaving process , including woven , knitted , woven and non-woven . Divided into warp knitting Nanda digital input module  and weft . After all the work on the needle with a group or several groups of yarns arranged in parallel , in the warp feeding machine , but formed into a circle knit , this method is called warp knitted fabric formed by weaving called matter . Our warp knitting industry after decades of development , constant restructuring, especially high in recent years, companies in emerging regions warp starting point , reasonable structure , significant  Nanda ethernet module plc economies of scale , into scientific research universities and research institutes , as well as research combined to make our warp knitting industry has been developing rapidly , is becoming the center of world warp industry. Traditional warp knitting machines , mostly chain-type warp knitting machine , because of its mechanical structure of the spindle drive , no import electric drive , resulting in its following disadvantages: woven flowers slow and inefficient ; chain complex mechanism , each replacement of a  Nanda micro smart plc flower , you need to spend more time , and each pattern corresponds to a chain block , this time to replace the long pattern , high cost. Resulting in the production of small batch orders lost meaning ; due to the complexity of the organization , resulting in a complex pattern can not be produced on a chain block machine . Only produce relatively simple fabric flower , can not meet the increasing demands , the current full servo warp knitting machine has gradually been applied in the textile . Now all servo on warp knitting machine production , efficiency , pattern diversity, quality of products have a good advantage , and therefore will become the mainstream in the future jacquard weaving .

plc cpu modules in the PLC control system design methods

First, the most important issue to mention the programmable controller technology is used in automatic control engineering , how to use a comprehensive knowledge learned in front of the point , according to the Nanda plc controller manufacturers  actual requirements of reasonable engineering combined into the control system , introduced in this control system consisting of a programmable controller general methods.
Second, the basic steps programmable controller system design 1. The main contents of the system design ( 1 ) to develop control system design specification. Technical conditions generally in the form of design task to determine which is the basis for the entire  Nanda cpu modules plc design ; ( 2 ) select the form of electric drive and motor , solenoid valve actuator ; ( 3 ) PLC selected models ; ( 4 ) the preparation of the PLC input / output allocation table or draw input / output terminal wiring diagram ; ( 5 ) to write software specification according to the system design requirements, and then use the appropriate programming language ( commonly ladder ) program design ; ( 6 ) understand and follow users cognitive Nanda plc digital input  psychology , attention to human-computer interface design , enhance rapport between man and machine ; ( 7 ) console design , electrical cabinets and non-standard electrical component parts

cpu modules plc purposes

Memory card CPU module must plug in the power-off state, the power does

not affect the operation because it is FLASH ROM.
Uninterruptible power plug, then the risk may  Nanda plc supplier damage the card is such a

set of rules, who would not take the risk hot plug, if you do not believe

this ramp, then it is so dry, may be uncertain or bad, but who can not

protect you Not bad, because he is not hot swap stuff.
U disk, IC card is hot swappable, but he Nanda analog output plc  has some special structure, in

addition to its reader device for his actions also have special

considerations when unplugging U disk like the best is to close , in

essence, is he not read and write.
PLC can not seen when the CPU module memory  Nanda Programmable Input Module card reader U disk hot-swap

operation is described as so considered, so that you do not take risks.

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.

cpu modules plc purposes

Memory card CPU module must plug in the power-off state, the power doesnot affect the operation 

because it is FLASH ROM.Uninterruptible power plug, then the risk may  Nanda plc supplier damage 

the card is such aset of rules, who would not take the risk hot plug, if you do not believethis ramp, 

then it is so dry, may be uncertain or bad, but who can notprotect you Not bad, because he is not hot 

swap stuff.U disk, IC card is hot swappable, but he Nanda analog output plc  has some special structure, 

inaddition to its reader device for his actions also have specialconsiderations when unplugging U disk

 like the best is to close , inessence, is he not read and write.PLC can not seen when the CPU module 

memory  Nanda Programmable Input Module card reader U disk hot-swapoperation is described as so 

considered, so that you do not take risks.