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4-2
Troubleshooting
4
2. Meanings of LEDs on CC-Link compatible module
SD
ERRL
RUN
RD
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
Front of the unit
The LEDs on the CC-Link compatible module express the following statuses.
Use these for confirmation when an error occurs.
Meaning
RUN ERRL SD
RD
Normal communication is taking place, but the CRC error
occurs sometimes because of noise.
The settings have varied from the baud rate and station No.
setting made when connected to the CC-Link system.
A CRC error occurred in the received data, and a response
cannot be made.
Normal communication
There is no data addressed to the local station.
Station No. setting illegal.
(Non-existing station No. was specified.)
Communication speed setting illegal.
(Unusable communication speed was specified.)
Polling response is being carried out, but a CRC error occurred
in the refresh reception.
A CRC error occurred in the data addressed to the local station.
Data has not been initialized.
The local station is not set to a remote device station.
There is no data addressed to the local station or the data
addressed to the local station cannot be received because of noise.
An illegal communication speed was set. (It can be spefified
but differs from the master station.)
Data cannot be received because of a line disconnection.
The power for communication has been cut off.
Communication with the master station was not possible when
the power was turned ON.
( : ON, : OFF, : Flicker)
Others An improbable state
c
CAUTION
Even if the LED displays indicate the
normal communication state, there
may be cases when communication
with the master station PLC is not
possible unless the initial data process
is carried out. Always carry out the
initial data process. (Refer to Chapter
3.)