Ladder logic is the most common programming language used for programmable logic controllers (PLCs) in the U.S.
Instruction list,
function block diagram,
structured text, and
sequential function charts are all useful programming languages and may be more appropriate than
ladder, depending on the application.
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A PROGRAMMABLE LOGIC CONTROLLER (PLC) is an industrial computer control system that continuously monitors the state of input devices and makes decisions based upon a custom program to control the state of output devices. ... That is, you can mix and match the types of Input and Output devices to best suit your application.
