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

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 ) .

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.

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 ) .