Sfc Program Execution; Starting And Stopping The Sfc Program - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

8.7

SFC Program Execution

Starting and stopping the SFC program

The SFC program can be started and stopped by either of the following methods.
• CPU parameter
• Starting and stopping the program by the special relay (SM321)
• Starting and stopping the program by using instructions
CPU parameter
Set "Auto-start block 0" to "Start Conditions Setting" in the CPU parameter. Block 0 of the SFC program starts automatically
when the CPU module is powered on or reset, or the operating status is changed from STOP to RUN. ( Page 132 Start
condition setting)
Starting and stopping the program by the special relay (SM321)
SM321 (SFC program start/stop) automatically turns on at execution of the SFC program. Once executed, the start/stop
status is controlled by SM321.
• The program execution can be stopped by turning off SM321.
• The program execution can be restarted by turning on SM321.
The resume start of the SFC program can be set in the CPU parameter ("SFC Program Start Mode Setting").
( Page 130 SFC program start mode setting)
Starting and stopping the program by using instructions
The SFC program is started and stopped by using the program control instructions. ( Page 137 Changing the execution
type by an instruction)
• The standby type SFC program is started by using the PSCAN instruction. The program execution type changes from the
standby type to the scan execution type.
• Outputs are turned off and the SFC program is stopped by the POFF instruction. The program execution type changes from
the scan execution type to the standby type.
8 SFC PROGRAM
8.7 SFC Program Execution
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