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5 Troubleshooting
CJ-series EtherCAT Slave Units Operation Manual (W541)
5-4 Troubleshooting with Emergency Messages
5
5-4-2 Emergency Error Codes
FF02 Errors related to
the CPU Unit
CPU Unit
Fatal Error
A fatal error occurred in the
CPU Unit.
Yes Clear the cause occurred
error, and restart CPU Unit,
and then turn OFF error bit
of AL status from Ether-
CAT master.
FF03 Output OFF
Error
An Output OFF condition
occurred in the CPU Unit.
FF04 CPU Unit
Watchdog
Timer Error
An error occurred in the
CPU Unit.
Replace the CPU Unit.
FF05 CPU Unit Ser-
vice Monitor-
ing Error
Servicing from the CPU
Unit was not completed
within the fixed interval.
Check the CPU Unit's
operating environment,
and then turn OFF error bit
of AL status from Ether-
CAT master.
I/O Bus Error An error occurred while
exchanging data with the
CPU Unit.
FF07 I/O Refresh
Error
The I/O communication
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.
Check I/O communication
area and reset with a cor-
rect allocation and restart
the EtherCAT Slave Unit.
Error
code
(hex)
Error type Error name Description
Notification to
EtherCAT
master
Corrective action
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