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11-4
SP.CONTSW
(2) If system switching was unsuccessful, the error flag (SM0) is turned ON and an error code is
stored into SD0.
• The tracking cable is disconnected or faulty. (Error code: 6220)
• Hardware fault, power-off, reset or watchdog timer error occurred in the standby system.
(Error code: 6220)
• Watchdog timer error occurred in the control system. (Error code: 6220)
• Preparations are being made for tracking transfer. (Error code: 6220)
• Communication time-out occurred. (Error code: 6220)
• Stop error, excluding watchdog timer error, occurred in the standby system.
(Error code: 6220)
• The operating status differs between the control system and standby system.
(Error code: 6220)
• Memory copy is being executed from the control system to the standby system.
(Error code: 6220)
• Write during RUN is being executed. (Error code: 6220)
• Network fault was detected by the standby system. (Error code: 6220)
Program Example
(1) The following program executes system switching on the leading edge of the system
switching command (M100).
If the system switching command (M100) remains ON, the SP.CONTSW instruction is also
executed by the new control system CPU module after system switching. Therefore, M101 is
added to the execution conditions as a consecutive switching prevention flag.
[Ladder Mode] [List Mode]
Instruction
Device
Step