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List of contents in this article:

• 1,Hearthstone arena class win rates redditplc's control system is mainly composed of input equipment
• 2, What are the characteristics of PLC and relay control systems?
• 3. What is the working process of What is the working process of the plc control system?

plc's control system is mainly composed of input equipment

PLC is composed of central processing unit, memory, power supply, program input device, input and output loop, work Principle composition.

PLC is composed of CPU module, input module, output module and programmer. CPU module CPU module, also known as a central processing unit or controller, is mainly composed of a microprocessor (CPU) and a memory.

It is composed of a central processing unit, memory, power supply, program input device, input and output loop, and working principle. Central processing unit Central processing unit (CPU) is the control hub of the PLC controller.

What are the characteristics of PLC and relay control systems?

High reliability. Because most PLCs use single-chip microcomputers, the degree of integration is high, coupled with the corresponding protection circuit and self-diagnosis functions, which improves the reliability of the system.(2) Programming is easy.

Control speed The relay control logic relies on the mechanical action of the contact to achieve control. The working frequency is low, the millisecond level, and the mechanical contact has jitter. PLC is controlled by program instructions to control the semiconductor circuit. It is fast, microsecond-level, strictly synchronized and has no jitter.

The switch state is different: SM400=M9036=M8000 represents frequent opening. SM401=M9037=M8001 stands for normal closure.

It has many and complex connections, large size and large power consumption. After the system is formed, it is difficult to change or add functions. The PLC control system has few connections, small size, low power consumption, and the contact number theory of each soft relay in the PLC is unlimited, so its flexibility and scalability are good.

What is the working process of the plc control system?

The working process of PLC is generally divided into three stages, namely input sampling, user program execution and output refresh. Completing the above three stages is called a scanning cycle. In the wholeDuring operation, the CPU of the programmable logic controller repeats the above three stages at a certain scanning speed.

The working principle of PLC is: when the PLC controller is put into operation, its working process is generally divided into three stages, namely input sampling, user program execution and output refresh. Completing the above three stages is called a scanning cycle.

Its working process is generally divided into three stages, namely input sampling, user program execution and output refresh. Completing the above three stages is called a scanning cycle. During the whole operation, the CPU of the programmable logic controller repeats the above three stages at a certain scanning speed.

The five stages of the plc work process are as follows: 1) Internal processing stage: At this stage, PLC checks whether the hardware of the CPU module is normal, resets the monitoring timer, and completes some other internal work.