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Programming language that represents a program by a graphical diagram based on the circuit diagrams of relay logic hardware; used to develop software for programmable logic controllers used in industrial control applications
Ladder logic was originally a written method to document the design and construction of relay racks as used in manufacturing and process control. Each device in the relay rack would be represented by a symbol on the ladder diagram with connections between those devices shown. In addition, other items external to the relay rack such as pumps, heaters, and so forth would also be shown on the ladder ... Wikipedia