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3
SEQUENCE PROGRAM EXECUTION
(3) CPU module operation processing at switch operation
RUN/STOP
status
RUN STOP
STOP RUN
Note3
Table3.1 Operation processing at switch operation
Sequence
program
External output
operation
processing
Saves the output (Y)
Executes up to
status immediately
the END
before switching to the
instruction and
STOP status, and turns
stops.
all points OFF.
Determined by the
"STOP RUN-time
Starts at step 0.
output mode" in the
PLC parameter dialog
box.
POINT
The CPU module performs the following in any of RUN and STOP status:
• I/O refresh processing
• Refresh processing of network modules
• Self-diagnostic processing
• Communication processing with external devices, such as GX Developer
• Intelligent function module dedicated instruction processing (only
completion processing)
Even in the STOP status, the CPU module can perform the following operations:
• I/O monitor and test operation with GX Developer
• Reading data from external devices using the MC protocol
• Communication with other stations via CC-Link IE controller network and
MELSECNET/H
Note3
CPU module operation processing
M,T,C,D
Saves the device memory
status immediately before
switching to the STOP
status.
Uses the device memory
status when the CPU module
had been set to STOP status.
3.4 RUN, STOP Operation Processing
Device memory
Y
Saves the output (Y)
status immediately
before switching to
the STOP status, and
turns all points OFF.
Determined by the
"STOP RUN-time
output mode" in the
PLC parameter
dialog box.
(
Section 6.10)
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