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MELSEC-Q
8 TROUBLESHOOTING
(b) Checking on the "Error History" screen
1
On this screen, errors including those occurred in other modules are
displayed, and the data can be output in a CSV file.
Error code and date and time of error occurrence can be checked even
after powering off and then on the programmable controller or after
resetting the programmable controller CPU.
On GX Works2, select [Diagnostics] [System Monitor], and then click
the System Error History button.
1: Available on the programmable controller CPU, network module, and
GX Works2 when their versions are respectively as follows.
Item Version
Programmable controller
CPU
Universal model QCPU whose serial number (first five digits) is
"11043" or later
Network module
Network module whose serial number (first five digits) is
"11042" or later
GX Works2 Version 1.12N or later
1) Error History List
Error log of the module is displayed.
For errors occurred during initial processing of the programmable controller
CPU, the date and time will be 0000/00/00 00:00:00, therefore the displayed
order under Error history list is not in the order in which the error occurred.
(Example: Station number setting error)
2) Error and Solution, Intelligent Module Information
• Error and Solution
The error description and corrective action for the error, which is currently
selected under "Error History List", are displayed.
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