Mitsubishi Electric MELSEC-Q Series User Manual page 216

3) If data link cannot be performed even after the above operation is performed,
perform the following:
• Checking the LEDs (Refer to Section 12.3.)
• Troubleshooting by symptom (Refer to Section 12.4.)
(2) Precautions on the "Error History" window
The following explains the Simple Motion module errors that may be shown in the "Error
History" window.
For errors of the modules other than the Simple Motion module and functionality of the
error history, refer to the manual for the relevant CPU module. (Refer to the "User's
Manual (Function Explanation, Program Fundamentals)" of the CPU module in use.)
(a) No error history is displayed.
In "PLC RAS" of PLC Parameter, check if the "Module Error History Collection
(Intelligent Function Module)" is selected.
(b) The time and date of the error is not correctly displayed.
If an error occurred during initial processing of the CPU module, "0000/00/00
00:00:00" is displayed.
(c) The error code is not correctly displayed.
Instead of an error code, "*HST.LOSS*" may be displayed in the "Error Code"
column if errors occurred at frequent intervals in the Simple Motion module.
If "*HST.LOSS*" frequently appears, increase the number of collected errors per
scan in "PLC RAS" of the PLC parameter window. (Refer to the "User's Manual
(Function Explanation, Program Fundamentals)" of the CPU module in use.)
(d) The same error code is not displayed again.
If the same error continuously occurred, only the first error is displayed in the
"Error History" window.
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Chapter 12 TROUBLESHOOTING