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 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.
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    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 .

elaborated plc cpu modules of

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 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  Nanda PLC Programmable Logic Controller 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 ? Urgent
Also this PLC as well as a relay output module , 2, 3 and 4-channel connection of solenoid valves, found often there will be 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 I checked, input 220V, power module output is 5.09V, I then adjust it to 5.01V, it should be no problem , there is no good suggestions, thank you
Solenoid valve and flow meter ( analog input signal ) is Nanda plc analog input output io module  a common 24V signal output transformer specification is 24V, 10A, PLC power supply is independent 220V! The first question : single look very bad judgment, but you said with the second question, I guess : 1, power solenoid valve is not you , and the same power to the PLC , the capacity is not enough power , the solenoid valve is energized when the voltage is pulled down , resulting in the second question . 2, the PLC analog input module often run power surge , a long time cause damage to the module .
Suggestions : plc output not directly with solenoid valve , intermediate relay over it. Separate power supply , and the capacity to be enough .