PLCs are complex and powerful computers. But, we can describe the function of a
PLC in simple terms. The
PLC takes inputs, performs logic on the inputs in the CPU and then turns on or off outputs based on that logic. ... The CPU monitors the status of the inputs (ex.
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As of 2015, the majority of PLC systems adhere to the IEC 61131-3 standard that defines 2 textual programming languages: Structured Text (ST; similar to Pascal) and Instruction List (IL); as well as 3 graphical languages: Ladder Diagram, Function Block Diagram (FBD) and Sequential Function Chart (SFC).
