Mitsubishi MELSEC-Q Series Programming Manual page 10

5. SFC PROGRAM PROCESSING SEQUENCE
5.1 Whole Program Processing of Basic Model QCPU .............................................................................. 5- 1
5.1.1 Whole program processing sequence ............................................................................................ 5- 1
5.2 Whole Program Processing of High Performance Model QCPU, Process CPU, Redundant CPU,
Universal model QCPU, LCPU, and QnACPU ..................................................................................... 5- 2
5.2.1 Whole program processing sequence ............................................................................................ 5- 2
5.2.2 Execution type designation by instructions .................................................................................... 5- 4
5.2.3 SFC program for program execution management ....................................................................... 5- 6
5.3 SFC Program Processing Sequence .................................................................................................... 5- 8
5.3.1 SFC program execution .................................................................................................................. 5- 8
5.3.2 Block execution sequence ................................................................................................................ 5-10
5.3.3 Step execution sequence .................................................................................................................. 5-11
5.3.4 Continuous transition ON/OFF operation ......................................................................................... 5-12
6. SFC PROGRAM EXECUTION
6.1 SFC Program START and STOP .......................................................................................................... 6- 1
6.1.1 SFC program resumptive START procedure ................................................................................. 6- 2
6.2 Block START and END .......................................................................................................................... 6- 4
6.2.1 Block START methods .................................................................................................................... 6- 4
6.2.2 Block END methods ........................................................................................................................ 6- 5
6.3 Block Temporary Stop and Restart Methods ........................................................................................ 6- 6
6.3.1 Block STOP methods ...................................................................................................................... 6- 6
6.3.2 Restarting a stopped block ............................................................................................................. 6- 9
6.4 Step START (Activate) and END (Deactivate) Methods ........................................................................ 6-11
6.4.1 Step START (activate) methods ....................................................................................................... 6-11
6.4.2 Step END (deactivate) methods ....................................................................................................... 6-12
6.4.3 Changing an active step status (Not available for Basic model QCPU,
Universal model QCPU, and LCPU) ................................................................................................ 6-13
6.5 Operation Methods for Continuous Transition ........................................................................................ 6-14
6.6 Operation at Program Change ................................................................................................................ 6-15
6.6.1 Operation at program change made by write to PLC ...................................................................... 6-16
6.6.2 Program change by online change ................................................................................................... 6-17
6.6.3 Online change (inactive block) .......................................................................................................... 6-18
APPENDICES
APPENDIX 1 Special Relay and Special Register List ....................................................................... APP- 1
APPENDIX 1.1 Special Relay (SM) List ............................................................................................. APP- 2
APPENDIX 1.2 Special Register (SD) List ......................................................................................... APP- 6
APPENDIX 2 MELSAP-II and MELSAP3 Comparison ....................................................................... APP- 7
APPENDIX 3 Restrictions on Basic Model QCPU, Universal Model QCPU,
and LCPU and Alternative Methods ................................................................................................... APP-18
APPENDIX 3.1 Step Transition Watchdog Timer Replacement Method ............................................ APP-20
APPENDIX 3.2 Periodic Execution Block Replacement Method ........................................................ APP-21
APPENDIX 3.3 Forced Transition Bit (TRn) Replacement Method .................................................... APP-22
APPENDIX 3.4 Active Step Change Instruction (SCHG) Replacement Method ................................ APP-23
A - 8
5- 1 to 5-14
6- 1 to 6-24
APP- 1 to APP-24
A - 8