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MELSEC-Q
8 TROUBLESHOOTING
8.4.1 Canceling a specific remote I/O station error
This section explains how to cancel an error of a specific remote I/O station by
manipulating the remote master station and the remote I/O station.
(1) Procedures for error cancellation
Use GX Developer and perform the following steps 1) to 7).
[Remote I/O station side]
1) Remove the cause of the remote I/O station error.
2) Store the error code to be canceled into special register SD50 of the
remote I/O module.
3) Turn OFF and then ON special relay SM50 of the remote I/O module.
4) The error in the remote I/O module is removed.
[Remote master station side]
5) Store the error code to be canceled into special register SD50 of the
CPU module.
6) Turn OFF and then ON special relay SM50 of the CPU module.
7) The error in the CPU module is removed.
(2) Precautions for error cancellation
(a) Status after error cancellation
When the error is cancelled, the related special relay, special register and
LEDs return to the status before the error occurrence.
If the same error occurs again after error cancellation, it is registered to the
error history again.
(b) In the case of the multiplexed remote I/O network that supports redundant
systems
After canceling the error in the control system CPU, cancel it in the standby
system CPU.
Cancel a standby CPU error by either of the following:
• Using SM50 and SD50 of the standby system CPU
• Using SM1649 and SD1649 of the control system CPU
REMARKS
For detailed error cancellation of the CPU module, refer to the following manuals.
• User’s manual (Function Explanation, Program Fundamentals) of the CPU module
used
• QnPRHCPU User’s Manual (Redundant System)