Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 149

■ When the operating status is changed from STOP to RUN
If the operating status of the CPU module is changed from RUN to STOP during execution of an SFC program, device values
and active/inactive state of the SFC program immediately before the stop are held and restored after the operating status is
changed back to RUN. The resume start is performed regardless of the CPU parameter setting ("SFC Program Start Mode
Setting").
If any of the sequence program file (including an SFC program), FB file, or parameter file (such as CPU parameter file and
system parameter file) is written to the CPU module while it is in the STOP state, the SFC program will be executed initially
when the operating status is changed back to RUN. Note that the resume start may be performed if there is no change in the
SFC program before and after writing the program file. ( Page 130 SFC program start mode setting)
■ Precautions
• After an SFC program is modified by writing data to the programmable controller, reset the CPU module, and execute the
SFC program.
• If "Resume Start" is set to "SFC Program Start Mode Setting" in the CPU parameter, turn off SM322 (SFC program start
mode) first, and modify the program by writing data to the programmable controller. Thereafter, initial-start the SFC program
and then turn on SM322 (resume start) again.
When online change is executed
After an SFC program is modified by online change, the resume start is performed regardless of the CPU parameter setting
("SFC Program Start Mode Setting").
8 SFC PROGRAM
8.7 SFC Program Execution
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