IAI America RCM-GW-CC - Manual (Page 128)

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10.2.3 Abnormality of CC-Link communication
When the CC-Link communication is abnormal, C.ER (Red) on the gateway status indication LED is lit.
Further, details of communication status can be checked by RUN (Green), ERR (Red), SD (Green) and RD
(Green) on the CC-Link communication status LED. When any abnormality occurs, check the operation status
with the status indication list on the next page.
★
Check the communication status LED, and check the following depending on each status.
[1] Check if wiring for the communication line is correctly connected.
[2] Check if the gateway unit is correctly set to the PLC (master station) as a remote device of four stations.
(Note that this is not remote I/O.)
[3] Check that address settings for remote I/O and remote input and output are not duplicated.
[4] Check if the terminal resistors are correctly connected, and resistance values are correct.
[5] Check if the power line which becomes a noise source is not wired near wiring of the SIO
communication line.