Vol. EE Reference
Chapter 9 Circuit Schematic Symbols

Switches, Electrically Actuated (Relays)

The structure behind ladder logic is based on the electrical ladder diagrams that were used with relay logic.

These diagrams documented how connections between devices were made on relay panels; they are called “ladder” diagrams because they are constructed in a way that resembles a ladder with two vertical rails and rungs between them.

 

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