Omron CJ1W- ECT21

5 Troubleshooting
5 - 2
CJ-series EtherCAT Slave Units Operation Manual (W541)
5-1 Error Notification and Checking
Methods
This section describes error notification, checking methods and procedures when an error has occurred
in the EtherCAT Slave Unit.
The EtherCAT Slave Unit uses the following methods to notify the CJ-series CPU Unit or EtherCAT
master that errors have occurred.
5-1-1 Error Notification Methods
Type of error notification Overview Notification method
Emergency message The emergency message reports applica-
tion level errors.
The error code contains the CiA-defined
error code, and an additional error code in
the unique header area.
When an error occurs, the EtherCAT
Slave Unit notifies the EtherCAT mas-
ter.
EtherCAT master
CJ-series
CPU Unit
Notification to the master:
Emergency message
AL status
•
•
Notification to the CJ-series CPU Unit:
Unit status
Slave status
•
•
CJ-series
EtherCAT Slave Unit
CJ1W-ECT21
Indicators