This language was invented for the express purpose of making PLC programming feel “natural” to electricians familiar with relay-based logic and control circuits.
This is a graphical language showing the logical relationships between inputs and outputs as though they were contacts and coils in a hard-wired electromechanical relay circuit. In the United States, the most common language used to program PLCs is Ladder Diagram (LD), also known as Relay Ladder Logic.
Ladder logic, or ladder diagram (LD) is the most common PLC programming language, with graphical elements designed to look and respond like electrical device contacts, easier for technicians and electricians to interpret.
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