5 Operation
5-54
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
Error Log Concept
The CJ1W-PRM21 PROFIBUS Master Units are equipped with an error logging mechanism which
will internally store error events. Most of the errors which are stored in the Unit’s Error Log are
stored in volatile memory, i.e. when power to the Unit is switched off the errors are lost.
Severe errors however are also stored in non-volatile memory, i.e. these error reports are still avail-
able after cycling the power down and up again. The errors which can be logged are listed in section
7-5-2 Error Codes and Detailed Codes. The CJ1W-PRM21 PROFIBUS Master Units can log up to
80 error events, 16 of which can be logged in non-volatile memory.
Detecting New Errors in the Error Log
If a new error event is logged in the Error Log of the Unit, the bit *_NewErrLogSta is set in the Unit
Status Word (*_UnitSta, see section 4-2-3 Unit Status (*_UnitSta)).
This bit flag can be evaluated by the user, through the CJ1W-PRM21 Master DTM Diagnosis User
Interface. In order to view the bit flag perform the following actions.
1
Open the CJ1W-PRM21 Master DTM Diagnosis User Interface,
2
Select the Monitor - Master Status tab
3
If the Automatic checkbox in the Refresh box has not been selected, press the Manual button to
refresh the status.
The figure below shows this Error Log Updated bit flag indicating that a new error event has been
logged.
5-7-3 Using the Error Log
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