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FX Series Programmable Controllers Basic Program Instructions 2
2-22
2.19 No Operation
Basic points to remember:
- Writin
g
NOP instructions in the middle of a pro
g
ram minimizes step number chan
g
es
when chan
g
in
g
or editin
g
a pro
g
ram.
- It is possible to chan
g
e the operation of a circuit b
y
replacin
g
pro
g
rammed instructions
with NOP instructions.
- Chan
g
in
g
a LD, LDI, ANB or an ORB instruction with a NOP instruction will chan
g
e the
circuit considerabl
y
; quite possibl
y
resultin
g
in an error bein
g
g
enerated.
- After the pro
g
ram ‘all clear operation’ is executed, all of the instructions currentl
y
in the
pro
g
ram are over written with NOP’s.
Mnemonic Function Format Devices Program steps
NOP
(No Operation)
No operation or
null step
N/A N/A 1