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Troubleshooting Section 14-5
Note If a memory error occurs in the error log area of EEPROM, the record will not
be stored in EEPROM.
14-5 Troubleshooting
14-5-1 CPU Unit's ERR/ALM Indicator Lit or Flashing
Use the following table to troubleshoot the system when the CPU Unit’s ERR/
ALM indicator is lit or flashing when the EtherNet/IP Unit or built-in EtherNet/
IP port is mounted.
For details, refer to the CPU Unit’s Operation Manual.
03D3 Link OFF error 00 hex 00 hex No
03D4 Verification error (Tag data link only)
Note For details on identifying the cause of
the verification error, refer to 14-3
Connection Status Codes and Error
Processing.
This error will not be stored when a
target node is missing for version 2.0
or higher.
Connection instance num-
ber (0 to 255)
Lower byte of IP address No
03D5 Tag data link error 00 hex Lower byte of IP address No
0601 CPU Bus Unit error Variable Yes
0602 CPU Bus Unit memory error 01: Read error
02: Write error
02 hex: Network parame-
ter
06 hex: Error log
09 hex: Identity data
0E hex: Unit name
0F hex: Ethernet basic
setting
10 hex: Ethernet
advanced setting
11 hex: MAC address
12 hex: Status area layout
setting
14 hex: Term Tag address
resolution memory write
error
Ye s
(See
note.)
Error
code
(hex)
Error Detail code Saved in
EEPROM
First byte Second byte
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 correct 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 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.