Remote Reset; Precautions - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Remote RESET

The following describes the remote RESET operation in a redundant system.
In backup mode
The CPU modules of both systems can be reset by performing the remote RESET operation on the control system CPU
module. Only the standby system CPU module can be reset by performing the remote RESET operation on the standby
system CPU module.
Select "Control System" or "Standby System" in the transfer setup, and select "Currently Specified Station/Specify Both
Systems" in "Specify Execution Target" of "Remote Operation".

■Precautions

The following describes the precautions on the remote RESET operation performed on both systems in backup mode.
• When the control system CPU module is in the STOP state and the standby system CPU module is in the RUN state,
performing the remote RESET operation on the control system CPU module causes system switching. To prevent system
switching in the remote RESET operation, perform the remote RESET operation after setting both of the CPU modules to
the STOP state.
• When a remote operation is performed on the CPU module of the control system or standby system through another path,
the standby system CPU module cannot be reset by performing a remote RESET operation on the control system CPU
module. To perform a remote RESET operation on the CPU module of the control system or standby system, use the path
that was used to perform the remote operation on the standby system CPU module. Cancel the remote operation first and
perform the remote RESET operation.
• When performing a remote RESET operation on both systems, select "Control System" in "Specify Redundant CPU". When
"Not Specified" is selected, an error may occur depending on the timing of the operating status change of each CPU
module.
[Online]  [Current Connection Destination]  [Specify Redundant CPU]
In separate mode
Only the CPU module of a system specified in the transfer setup of the engineering tool can be reset. The operating status of
the CPU module in a system not specified is not changed.
Precautions
The following describes the precautions on the remote operation in the redundant system.
• When the control system or standby system is in the initial processing (the READY LED is flashing), do not perform the
remote operation of "Specify Both Systems". If such an operation is performed, both systems may be recognized as being
mismatched in the system consistency check because the operating statuses may be mismatched.
28 FUNCTIONS
492
28.12 Remote Operation