NOP instruction for no operation, mainly used for short circuit, change the circuit functions and procedures to use when debugging.
Added to the program after no operation, no effect on the results of logical operations, but when the program is changed in the future, replaced by other directives no operation, can reduce the program changes.
If no operation replace LD, LDI, ANB, and ORB directives, circuits will be more substantial changes, care must be taken.
PLC ONE 