PLC R&D Engineer's View on PLC Working Principle

Many people think that PLC is very mysterious. In fact, PLC is very simple. In addition to its fast internal CPU, other functions are not as good as ordinary single-chip microcomputers. Usually, the PLC uses a 16-bit or 32-bit CPU with one or two serial channels to communicate with the outside world. There is a timer inside. To improve reliability, it is enough to add a watchdog timer.

The key technology of PLC is that it internally solidifies a program that can interpret the ladder language and the auxiliary communication program. The efficiency of the ladder language interpretation program determines the performance of the PLC. The communication program determines the difficulty of exchanging information between the PLC and the outside world. For simple applications, it usually operates as a stand-alone controller. There is no need to exchange information with the outside world. It is only necessary to internally embed a program that can interpret the ladder language. In fact, the main job of designing a PLC is to develop a program that interprets the ladder language.

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