Omron SYSMAC CJ1W-EIP21 - Manual (Page 373)

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Using the LED Indicators and Display for Troubleshooting Section 14-2
Ethernet Information Tab
Page The Ethernet Information Tab Page shows the communications status at the
communications driver level. The error counter information can be used to
confirm whether communications problems have occurred. The tag data link
information can be used to confirm characteristics such as the bandwidth
usage (pps).
14-2 Using the LED Indicators and Display for Troubleshooting
14-2-1 Errors Occurring at the EtherNet/IP Unit or Built-in EtherNet/IP
Port
Errors Related to CPU Unit
Data Exchange The 7-segment display alternates between the node address and error code.
Indicator Error Cause Unit operation (Flag
status)
Error
log
(hex)
Countermeasure
MS NS 7-segment
Flashing
red Not lit H1 Duplicate unit
number The same unit
number is set on
another Unit. Operation stops. --- Set the unit num-
bers correctly and
restart the Ether-
Net/IP Unit or built-
in EtherNet/IP port.
Flashing
red Not lit H2 CPU Unit
faulty --- Operation stops. --- Replace the CPU
Unit if the error
recurs when the
CPU Unit is
restarted.