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MELSEC-Q
8 TROUBLESHOOTING
8.3 Error Codes
When a trouble such as data link failure has occurred, the error cause can be identified
by using an error code.
8.3.1 How to check error codes
To check error codes for all network modules, follow either procedure (1) or (2)
described in this section.
The codes can also be checked in link special registers (SW) and completion status of
dedicated instructions. (Refer to (3) and (4) in this section.)
Remarks
By using GX Works2, the error history of the entire system can be checked even
after errors were cleared by powering on and then off the programmable controller or
by resetting the programmable controller CPU. (Refer to (2) (b) in this section)
(1) Checking with GX Developer
1) On GX Developer, select [Diagnostics] [System monitor], and then
click the Module's Detailed Information button.
2) On the "System Monitor" screen, select a network module and double-
click on it.
The Module's Detailed Information screen and PLC diagnostics screen
are displayed for the remote master station and remote I/O station
respectively.
"System Monitor" screen for a remote master station
"System Monitor" screen for a remote I/O station