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In a complex system there will be many « rungs » on a ladder, which are numbered in order of evaluation. As each of the lines (or rungs) are evaluated the output coil of a rung may feed into the next stage of the ladder as an input. Typically, complex ladder logic is ‘read’ left to right and top to bottom. They are called “ladder” diagrams because they resemble a ladder, with two vertical rails (supply power) and as many “rungs” (horizontal lines) as there are control circuits to represent. ![]() ![]() Ladder diagrams are specialized schematics commonly used to document industrial control logic systems.
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