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Many industrial control personnel are familiar with PLC control. We all know that PLC control requires pre-written PLC programs; only when the program is set can the PLC execute according to the established program.

The ladder diagram is the fastest and most effective way to program PLCs. Many beginners learning PLCs are unfamiliar with ladder diagrams and may not know where to start. Today, we will focus on some classic circuits commonly found in PLC ladder diagrams:

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