12 - 13
12   Troubleshooting and Maintenance
GX-series EtherCAT Slave Unit User’s Manual
12-1  Troubleshooting
12
12-1-3  Error Notification Methods and Types
This section describes the notification methods for errors that occur in the Slave Units.
12-1-3 Error Notification Methods and Types
Error notification 
type
Description Notification method Page
Sysmac error 
status
Notification is provided when an error is 
detected in the application. These errors 
are displayed only on the OMRON 
Sysmac Studio Support Software.
Error status is received by the 
TxPDO and the master is 
notified of errors every cycle.
"12-1-4 
Sysmac Error 
Status Codes" 
in page 12 - 14
Emergency 
messages
Notification is provided of 
application-level errors. Either 
CiA-defined error codes are used or 
error codes are added to vendor-specific 
areas.
The slave notifies the master 
when an error occurs.
"12-1-5 
Emergency 
Error Code" in 
page 12 - 19
Application layer 
status
Notification is provided of errors in 
EtherCAT communications. The error 
notification method and error codes that 
are defined by ETG are used.
The master is notified by writing 
to the application layer status 
register when an error occurs.
"12-1-6 
Application 
Layer Status 
Codes" in 
page 12 - 21
Emergency message
Sysmac error status
Application layer status
Error occurs.
Master notified.
Diagnosis 
history
ID211
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EtherCAT Slave Unit
EtherCAT Master Unit