How To Quickly Understand The Logical Thinking Of PLC Programming?

A PLC is essentially a computer specially designed for industrial control. Its hardware structure is basically the same as that of a microcomputer. It basically consists of power supply, central processing unit, memory, input unit and output unit.

The most fundamental logical thinking of plc is determined by the process flow of the equipment it controls, not out of thin air, but mainly through the plc program and its peripheral circuits. Therefore, if you want to quickly understand the logic of PLC, the first task is to understand the operation process of the equipment, which motors are the control objects, and the types of motors can be divided into these three types according to their structure and working principle: asynchronous motors, stepper motors, and other types of motors. Servo motors, what is the working and logical sequence between these objects. The easiest way is to know through the equipment operation manual.

The process requirements of the equipment determine the selection of plc electrical components and the programming of the program. The electrical components can be observed by controlling the power distribution cabinet. The main ones are the model of the plc and some relays of the control object (intermediate relays, contactors, etc. ), motor drives (frequency converters, servo drives, etc.), analog sensors, switching power supplies, and some input signals such as button switches and limit switches.

If you want to know all the electrical components, specific models and wiring diagrams in detail, you need to view the drawings, which will display schematic diagrams and various reports. These things can be seen intuitively, and its functions and control effects are also clear, while the PLC program cannot be directly reflected, it must be viewed through the programming software, and the interpretation of the program must first recognize the input signal. And output signal, it is better to choose the source program with comments for better understanding.

Therefore, if you want to quickly understand the logical thinking of a plc control system, the process flow, electrical components and plc program must be closely integrated, and it is very difficult to understand any single item.

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