NOP 0 or 1

Here the PLC does not do anything.

The instruction is used by the system as wildcard for not connected inputs of flipflops and the like, so that the retranslation from STL to FBD or LAD is easier.

If you program in STL you will usually use this instruction because of the fact that in one line with jump label an instruction has to be.

See also:

BLD

List of operations