Mitsubishi 00JCPU User Manual page 207

(d) In a redundant system where the Redundant CPU is used
Remote RESET operation is performed for the control system CPU module in backup mode. As a result, the
CPU modules in both systems are reset.
When the CPU module is in separate mode or debug mode, the operation is performed for only the CPU
module in the system specified in the connection target settings.
1) When the Redundant CPUs are in backup mode
Perform the remote RESET operation for the control system CPU module. (The CPU modules in both
systems are reset.)
If the operation is performed for the standby system CPU module, an error (error code: 4240
2) When RUN/STOP status differs between the CPU modules (in backup mode) in two
systems
When performing the remote RESET operation, if the control system CPU module is in the STOP status, set
the standby system CPU module to the same status.
If the operation is performed with the control system CPU module in the STOP status and the standby system
CPU module in the RUN status, the systems will be switched.
In the case with the control system CPU module in the RUN status and the standby system CPU module in
the STOP status, only the standby system CPU module is reset.
3) When a WDT error has occurred in the standby system CPU module (in backup
mode)
The standby system CPU module cannot be reset even when the remote RESET operation is performed for
the control system CPU module.
In this case, perform the operation using the following path (communication path where the tracking cable is
not relayed).
• Directly connect a personal computer (GX Developer) to the standby system CPU module.
• Perform the operation via a module in the standby system (such as use of the MC protocol).
CHAPTER6 FUNCTIONS
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