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2.5
Operation Processing in the RUN, STOP, or PAUSE
Status
There are three types of operating status of the CPU module.
• RUN status
• STOP status
• PAUSE status
This section describes program operation processing in the CPU module based on its operating status.
(1) Operation processing in the RUN status
RUN status is a status where sequence 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 mode parameter setting when its status
is changed to RUN. (
• Output (Y) status saved in the STOP status
• Result of operations performed after one scan
(b) Processing time required before operations
The processing time required for the CPU module to start sequence program operations after its operating
status is changed from STOP to RUN varies depending on the system configuration and/or parameter settings.
(It takes one to three seconds normally.)
(2) Operation processing in the STOP status
STOP status is a status where sequence program operations are stopped by the RUN/STOP/RESET switch or
the remote STOP function.
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 sequence program operations are stopped by the remote PAUSE function after
operations are performed for one scan, holding the output and device memory status.
Page 125, Section 3.4)
CHAPTER 2 APPLICATION OF PROGRAMMING
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