Omron CJ1W-ECT21 Operation Manual page 136

5 Troubleshooting
Error
code Error type
(hex)
FF02 Errors related to
the CPU Unit
FF04
FF05
FF07
5 - 26
Error name Description
CPU Unit A major fault occurred in
Major Fault the CPU Unit.
CPU Unit An error occurred in the
Watchdog CPU Unit.
Timer Error
CPU Unit Ser- Servicing from the CPU
vice Monitor- Unit was not completed
ing Error within the fixed interval.
I/O Bus Error An error occurred while
exchanging data with the
CPU Unit.
I/O Refresh The I/O communication
Error area does not exist in the
CPU Unit.
This can occur when the
I/O communication area is
set incorrectly, when the
Unit is mounted to a differ-
ent CPU Unit with a differ-
ent number of EM banks or
when EM has been con-
verted to file memory.
CJ-series EtherCAT Slave Units Operation Manual for NJ-series CPU Unit (W542)
Notification to
EtherCAT Corrective action
master
Yes Clear the cause of the
error, restart the CPU Unit
and then turn OFF error bit
of AL status from the
EtherCAT master.
Replace the CPU Unit.
Check the CPU Unit's
operating environment and
then turn OFF error bit of
AL status from the Ether-
CAT master.
Check the I/O communica-
tion area, reset with a cor-
rect allocation and then
restart the EtherCAT Slave
Unit.