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CHAPTER 2 APPLICATION OF PROGRAMMING
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2.4 Operation Processing of the CPU Module for Each Operating Status
2.4 Operation Processing of the CPU Module for Each
Operating Status
There are three types of operating status for the CPU module.
• RUN status
•STOP status
• PAUSE status
(1) Operation processing in the RUN status
RUN status is a status where program operations are repeatedly performed in a loop between the step 0 and the
END (FEND) instruction.
(a) Output status when entering the RUN status
The CPU module outputs either of the following according to the output module parameter setting when its
status is changed to RUN. ( Page 93, Section 3.7)
• Output (Y) status saved immediately before entering the STOP status
• Result of operations performed for one scan after entering the RUN status
(b) Processing time required before operations
The processing time required for the CPU module to start program operations after its operating status is
changed from STOP to RUN varies depending on the system configuration and/or parameter settings.
(Normally, it takes one to three seconds.)
(2) Operation processing in the STOP status
Stop status is a status where the operation is stopped. The CPU module status will be changed to STOP when a
stop error occurs.
(a) Output status when entering the STOP status
When entering the STOP status, the CPU module saves data in the output (Y) and turns off all outputs. The
device memory other than that of the output (Y) will be held.
(3) Operation processing in the PAUSE status
PAUSE status is a status where program operations are stopped after operations are performed for one scan,
holding the output and device memory status.
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