Yamaha RCX Series owner manual Meanings of LEDs on CC-Link compatible module, RUN Errl SD RD

2. Meanings of LEDs on CC-Link compatible module

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Troubleshooting

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.)

			2	3
	0	1			4
					5
	9
			8		6
				7
		1	2	3	4
RUN	0				5
	9
	0	1	2	3	6
					4
			8	7
ERRL	9				5
			8		6
				7
SD
RD

Front of the unit

The LEDs on the CC-Link compatible module express the following statuses. Use these for confirmation when an error occurs.

RUN ERRL SD RD Meaning

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.

Others An improbable state

( : ON, : OFF, : Flicker)

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