Mitsubishi Electric MELSEC-Q Series Programming Manual page 24

■Precautions for creating SFC program
• The SFC programs that can be created are "scan execution type program" and "stand-by type program".
• Two SFC programs (one normal SFC program and one program execution management SFC program) can be set as a
scan execution type program.
• More than one SFC program can be set as a stand-by type program.
• The stand-by type SFC program is executed in the following procedure.
1.
The currently executed scan execution type program is switched to the stand-by type program by using the POFF
instruction.
2.
The stand-by type program to be executed is switched to the scan execution type program by using the PSCAN
instruction. Use the PSCAN instruction to switch the execution type of the program.
For details on the PSCAN and POFF instructions, refer to the Programming Manual (Common Instructions) for the CPU
module used.
*1 The Redundant CPU, Universal model QCPU, and LCPU cannot execute the low-speed execution type program.
*2 The program execution management cannot set on the Universal model QCPU and LCPU.
3 SPECIFICATIONS
22
3.1 Performance Specifications Related to SFC Programs
*2