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3.6.3
Remote RESET
This operation resets the CPU module externally when the CPU module is in the STOP status. Even if the
RUN/STOP/RESET switch is in the RUN position, this operation can be performed when the module is stopped due to
an error detected by the self-diagnostics function.
(1) Application
This operation is useful to reset the CPU module remotely when an error occurs in the CPU module placed in an
inaccessible location.
(2) Executing method
(a) Using a programming tool
Select [Online] [Remote Operation] "RESET".
(b) Using an external device in the MC protocol
Use the MC protocol command. For the commands, refer to the following.
MELSEC Communication Protocol Reference Manual
Before performing the remote RESET operation, select the "Allow" checkbox for the remote RESET operation in the PLC
System tab of the PLC parameter dialog box, and write the parameter setting to the CPU module. Without the preset
parameter setting, the operation cannot be performed.
(3) Precautions
(a) Remote RESET in the RUN status
When the CPU module is in the RUN status, the remote RESET operation cannot be performed.
To perform the operation, change the operating status of the CPU module to STOP by the remote STOP.
(b) Status after reset processing
After reset processing of the remote RESET operation is completed, the CPU module will be placed in the
operating status set by the RUN/STOP/RESET switch.
If the RUN/STOP/RESET switch is set to STOP, the CPU module will be in the STOP status. If the switch is set
to RUN, the CPU module will be in the RUN status.
● If the remote RESET operation is performed to the CPU module which is stopped due to an error, note that the CPU
module will be placed in the operating status set by the RUN/STOP/RESET switch after reset processing is completed.
● If the CPU module cannot be reset by the remote RESET operation from a programming tool, check if the remote RESET
operation is set to "Allow" under the PLC System tab in the PLC parameter dialog box.
If the "Allow" checkbox is not selected, the CPU module cannot be reset even after the remote RESET processing from a
programming tool is completed.
(c) When an error occurs due to noise
Note that the CPU module may not be reset by the remote RESET operation. In this case, reset the CPU
module using the RUN/STOP/RESET switch or power off and then on the CPU module.
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