Omron CJ1W-ECT21 Operation Manual page 134

5 Troubleshooting
Event name Illegal State Transition Request Received
Meaning An incorrect state transition request was received.
An unclear state transition request was received.
Source PLC Function Module
Error Level
attributes
Effects User program
Sys- Variable
tem-defined
None
variables
Cause and Assumed cause
correction
An incorrect state transition
request was received.
An unclear state transition request
was received.
Attached None
information
Precautions/ None
Remarks
Event name I/O Communications Error
Meaning Process data communications were stopped for more than the specified period of time.
Source PLC Function Module
Error Level
attributes
Effects User program
Sys- Variable
tem-defined
None
variables
Cause and Assumed cause
correction
The EtherCAT communications
cable is disconnected or broken.
There is an error in the EtherCAT
master.
Attached None
information
Precautions/ None
Remarks
5 - 24
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Change states correctly accord-
ing to EtherCAT specifications.
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Connect the EtherCAT communi-
cations cable securely.
Check the operation of the Ether-
CAT master and take appropriate
measures if there is a problem.
CJ-series EtherCAT Slave Units Operation Manual for NJ-series CPU Unit (W542)
Event code 356B0000 hex
CJ-series Unit Detection
timing
Automatic Log category
recovery
The EtherCAT communications depends on the
state when the state transition request was received.
Name
---
Prevention
Change the communications state
as following for the EtherCAT
Slave Unit: Between Init state and
Pre-Operational state, between
Pre-Operational state and
Safe-Operational state, or
between Safe-Operational state
and Operational state.
Event code 852C0000 hex
CJ-series Unit Detection
timing
Automatic Log category
recovery
The EtherCAT communications enters Safe-Opera-
tional state.
The output data from the EtherCAT master is
retained.
Name
---
Prevention
Connect the EtherCAT communi-
cations cable securely.
None
At EtherCAT
communica-
tions state tran-
sition
System
Continuously
System