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8.2 Error Clear
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(3) Corrective Actions When LEDs Do not Return to Status Prior to Error
Occurrence
If error clear is performed but LEDs do not return to the status prior to the error
occurrence, this might indicate that multiple continuation errors have occurred
simultaneously or multiple annunciators are ON.
The following explains the methods of checking whether multiple continuation errors
have occurred simultaneously or whether multiple annunciators are ON, and the
method of clearing the errors.
(a) Continuation Errors other than Annunciator (F) ON (error code: 9000)
The error code of the latest continuation error is stored in a special register (SD0/
SD1610).
If the LEDs do not return to the status prior to the error occurrence even when
error clear operation has been performed for the error, which corresponds to the
error code stored in special register (SD0/SD1610), check the error history
information in the online PLC diagnostics of GX Developer.
*1
Clear the latest errors and any errors that occurred simultaneously in the error
history.
* 1: When error clear operation is performed and the error is cleared, the SD0/SD1610 information
shows "No Errors".
Therefore, the errors that occurred simultaneously with the latest one cannot be confirmed by SD0/
SD1610.
(b) Annunciator (F) ON (error code: 9000)
Whether Annunciator (F) is ON (error occurrence is detected) and the number of
annunciators that detected errors can be checked using the special relay and
special register below.
• SM62 (Detection of annunciator ON)
• SD63 (Number of annunciators ON)
Perform error clear operation repeatedly until SM62 will be off, or SD63 will be 0,
then turn all annunciators from ON to OFF.
