5 Troubleshooting
5 - 12
CJ-series EtherCAT Slave Units Operation Manual (W541)
Others
Use the following table to troubleshoot the system if the CPU Unit’s ERR/ALM indicator is lit or flashing
when the EtherCAT Slave Unit is mounted.
Refer to the CPU Unit’s operation manual for details.
Indicator
Error Cause
Unit opera-
tion
Error
log
(hex)
CIO
area
Countermeasures
ECAT
RUN
ECAT
ERR
ERC ERH RUN
--- --- --- --- --- IN Port
Link OFF
The IN port link is
turned off after
turned on once.
--- --- (n+13)
bit 14
Connect the Ether-
CAT communica-
tions cable.
OUT Port
Link OFF
The OUT port link
is turned off after
turned on once.
(n+13)
bit 15
Not
Lit
B Lit Restart The Unit was
restarted.
(n+12)
bit 01
Turn OFF the error
bit of AL status
from the EtherCAT
master.
The voltage is
present in the Unit
immediately after
power is turned
OFF. The power is
turned ON in this
state.
5-2-2 Corrective Actions When the CPU Unit’s Indicators are Lit or
Flashing
Error Corrective action
An I/O verification error occurred. • Confirm that the Unit is connected properly.
• Check the I/O table with the I/O table verification operation and cor-
rect it if necessary. After correcting it, perform the I/O table create
operation.
A CPU Bus Unit setting error
occurred.
• The CPU Bus Unit model registered in the I/O tables does not match
the model of CPU Bus Unit actually mounted. Check the I/O tables
with the I/O table verification operation and correct it if necessary.
After correcting the I/O tables, perform the I/O table create operation.
A CPU Bus Unit error occurred. • Confirm that the Unit is connected properly.
• Restart the Unit. Replace the Unit if it doesn’t restart.
An I/O bus error occurred. • Confirm that the Unit is connected properly.
• Restart the Unit. Replace the Unit if it doesn’t restart.
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