Omron CJ1W-FLN22, Operation Manual, Page: 187 / 277

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Maintenance Section 10-5
CMND(490)
For network relay errors using CMND(490), the location of the relay error is
recorded in the second through third words of the response, as shown below.
Check the node in which the error occurred, and remove the cause of the
error in that node.
10-5 Maintenance
The FL-net Unit makes up part of a network. Repair a defective FL-net Unit as
soon as possible as it can have a negative effect on the entire network. We
recommend that customers keep one or more spare FL-net Units to allow
immediate recovery of the network.
Replacing an FL-net Unit Observe the following precautions when replacing the FL-net Unit.
• Always turn OFF the power supply before replacing the FL-net Unit.
• Check that the spare FL-net Unit is operating normally before replacing a
defective Unit with it.
• When returning a defective Unit for repairs, provide as much written infor-
mation as possible on the symptoms of the problem.
• If a problem occurs with poor contacts, wipe the contacts with a clean
cloth soaked with industrial alcohol. Carefully remove any lint remaining
on the contacts before replacing the Unit.
Settings after Replacing
an FL-net Unit After replacing an FL-net Unit, set the following to the same settings as were
used on the previous Unit.
• Unit number
• Node address
• Local IP address
• System Setup (only when using the Unit built-in method)
Settings after Replacing a
CPU Unit The EEPROM in the CPU Unit holds the information listed below. This infor-
mation must be stored in any new CPU Unit used to replace a defective one.
• Routing tables
• System Setup
First byte
Command code
Second byte
First word
Bit
Third word
Main response code (MRES)
Sub-response code (SRES)
Second word
Relay Error Flag
PLC Non-fatal Error Flag
1: PLC Fatal Error Flag
Error node address
Error network address