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4-5.
Program control instructions
Program control instructions are instructions to advance the individual program of the program-
mable controller.
4-5-1.
NOP
...
No processing
NOP is the instruction for no processing, and it has no influence on the operation result up to
that time.
NOP is used to provide an intermediate space for memory revision, or as shown in the figure,
(a) When the contact Y97 is short-circuited by 6 AND Y97
(b) The contact X8 is sepa-
rated with 11 OR1 X8
+
11
NOP.
The programming unit (PU) is
provided with a function for
consecutive NOP writing, in-
sertion, and cancellation, so
that the operation is easy.
Please refer to .the instruction
manual for the PU.
NOP.
I '
\
Fig. 4-40, Contact cancellation by NOP instructions
-37-
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