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(4) Operation processing in the CPU module when switch operation is performed
The operation processing of CPU module performs the following according to the RUN/STOP status.
The CPU module performs the following in any of the RUN, STOP, or PAUSE status.
• Refresh processing with I/O modules
• Auto refresh processing with intelligent function modules
• Intelligent function module dedicated instruction processing (completion processing only)
• Self-diagnostics processing
• Service processing
• Special relay/special register value setting (only for those that should be set during END processing)
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 a programming tool
• Read/Write data from/to external devices using the MC protocol
RUN/STOP
status
CPU module operation processing
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.
( Page 93, Section 3.7)
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 present.
Local device data are cleared.
The CPU module outputs data
according to the output mode
parameter setting.
( Page 93, Section 3.7)