3
SEQUENCE PROGRAM EXECUTION
3.4 RUN, STOP Operation Processing
3
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O
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unb
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Assig
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Me
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Func
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Co
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(3) CPU module operation processing at switch operation
Note3
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
Table3.1 Operation processing at switch operation
RUN/STOP
status
CPU module operation processing
Sequence
program
operation
processing
External output
Device memory
M,T,C,D
Y
RUN STOP
Executes up to
the END
instruction and
stops.
Saves the output (Y)
status immediately
before switching to the
STOP status, and turns
all points OFF.
Saves the device memory
status immediately before
switching to the STOP
status.
Saves the output (Y)
status immediately
before switching to
the STOP status, and
turns all points OFF.
STOP RUN
Starts at step 0.
Determined by the
"STOP RUN-time
output mode" in the
PLC parameter dialog
box.
Uses the device memory
status when the CPU module
had been set to STOP status.
Determined by the
"STOP RUN-time
output mode" in the
PLC parameter
dialog box.
(
Note3
Summary of Contents for MELSEC QS Series
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