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Sequence Control Instructions Section 3-4
3-4-2 NO OPERATION: NOP(000)
Purpose This instruction has no function. (No processing is performed for NOP(000).)
Ladder Symbol There is no ladder symbol associated with NOP(000).
Variations
Applicable Program Areas
Description No processing is performed for NOP(000), but this instruction can be used to
set aside lines in the program where instructions will be inserted later. When
the instructions are inserted later, there will be no change in program
addresses.
Flags No flags are affected by NOP(000).
Precautions NOP(000) can only be used with mnemonic displays, not with ladder pro-
grams.
3-4-3 Overview of Interlock Instructions
Interlock Instructions The following instruction combinations can be used to interlock outputs in a
program section.
• INTERLOCK and INTERLOCK CLEAR (IL(002) and IL(003))
• MULTI-INTERLOCK DIFFERENTIATION HOLD and MULTI-INTERLOCK
CLEAR (MILH(517) and MILC(519))*
Note MILH(517) holds the status of the Differentiation Flag, so differen-
tiated instructions that were interlocked are executed after the in-
terlock is cleared.
• MULTI-INTERLOCK DIFFERENTIATION RELEASE and MULTI-INTER-
LOCK CLEAR (MILR(518) and MILC(519))*
Note MILR(518) does not hold the status of the Differentiation Flag, so
differentiated instructions that were interlocked are not executed af-
ter the interlock is cleared.
Variations Executed Each Cycle for ON Condition NOP(000)
Immediate Refreshing Specification Not supported
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
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