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CHAPTER3 CPU MODULE OPERATION
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3.5 Operation Processing in the RUN,STOP, or PAUSE Status
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(4) Operation processing in the CPU module when switch operation is performed
The CPU module performs the following in any of the RUN, STOP, or PAUSE status.
• Refresh processing with I/O modules
• Refresh processing with network modules
• Auto refresh processing with intelligent function modules
• Self-diagnostics processing
• Service processing
• Intelligent function module dedicated instruction processing (completion processing only)
• Operation processing of Multiple CPU high speed transmission function
Even if the CPU module is in the STOP or PAUSE status, the following operations can be executed.
• I/O monitor or test operation from GX Developer
• Read/write data from/to external devices using the MC protocol
• Communication with other stations using CC-Link IE controller network or MELSECNET/H
• Communication with CC-Link remote stations
Table3.2 Operation processing when switch operation is performed
RUN/STOP
status
CPU module operation processing
Sequence program
operation
processing
External output
Device memory
M,L,S,T,C,D Y
RUN
STOP
The CPU module
executes the program
until the END
instruction and stops.
The CPU module saves
the output (Y) status
immediately before its
status is changed to
STOP and turns off all the
outputs.
The CPU module holds the device
memory status immediately before its
status is changed to STOP.
The CPU module saves
the output (Y) status
immediately before its
status is changed to
STOP and turns off all the
outputs.
STOP
RUN
The CPU module
executes the program
from the step 0.
The CPU module outputs
data according to the
output mode parameter
setting.
( Section 6.4)
The CPU module holds the device
memory status immediately before its
status is changed to STOP.
Note that the CPU module uses initial
device values if those values are
preset.
Local device data are cleared.
The CPU module outputs
data according to the
output mode parameter
setting.
( Section 6.4)