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SP.CONTSW
(b) If systems could not be switched due to any of the reasons given in the following table, the error completion device
turns ON when system switching is executed in the END processing.
Reason No.
0
1
2
3
4
5
6
7
8
9
10
When the error completion device was turned ON due to unsuccessful system switching, 16 is stored into the
"reason(s) for system switching (SD1588)" and the reason No. of the above table into the "reason(s) for system
switching failure (SD1589)".
(6) Use a user program or GX Developer to turn OFF the error completion bit that has turned ON.
If normal system switching is performed by the execution of the SP.CONTSW instruction with the error completion device
ON, the error completion device of the new standby system CPU module is also turned OFF.
When system switching is performed due to a factor other than the SP.CONTSW instruction, however, the error
completion device is not turned OFF.
Operation Error
(1) In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into
SD0.
Error
code
The value specified at
4110
instruction.
The manual switching enable flag (SM1592) is OFF (disabled) at the
4120
execution of the SP.CONTSW instruction.
The SP.CONTSW instruction was executed by the standby system CPU
4121
module in the separate mode.
The SP.CONTSW instruction was executed in the debug mode.
(2) If system switching was unsuccessful, the error flag (SM0) is turned ON and an error code is stored into SD0.
Error
code
The tracking cable is disconnected or faulty.
Hardware fault, power-off, reset or watchdog timer error occurred in the
standby system.
Watchdog timer error occurred in the control system.
Preparations are being made for tracking transfer.
Communication time-out occurred.
A stop error, excluding watchdog timer error, occurred in the standby
6220
system.
The operating status differs between the control system and standby
system.
Memory copy is being executed from the control system to the standby
system.
Writing during RUN
Network fault was detected by the standby system.
704
Reasons for System Switching Failure
Normally completed
Tracking cable is disconnected or faulty.
Hardware fault, power-off, reset or watchdog timer error occurred in the
standby system.
Watchdog timer error occurred in the control system.
Preparations being made for tracking transfer.
Communication time-out.
Stop error occurred in the standby system. (Excluding watchdog timer error)
Operating status different between the control system and standby system.
Memory copy being executed from the control system to the standby system.
Write during RUN being executed.
Network fault detected by the standby system.
Error details
is 0 at execution of the SP.CONTSW
S
Error details
Q00J/
Q00/
QnH
QnPH QnPRH
Q01
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––
Q00J/
Q00/
QnH
QnPH QnPRH
Q01
––
––
––
QnU
LCPU
––
––
––
––
––
––
QnU
LCPU
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