What is Ladder Diagram?

Ladder Diagram, a graphical programming language, is used to design logic for PLCs. Maple Systems Inc. MapleLogic PLC programming software utilizes Ladder Diagram, LD for short. Each rung represents a specific control operation with inputs and outputs arranged in sequence.

Ladder diagrams are standardized by the International Electrotechnical Commission (IEC), specifically under IEC 61131-3. The standard was developed by international committees to ensure consistency and compatibility across PLC platforms.

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