IAI Rcon, Instruction Manual, Page: 462 / 838

4.2 Master Side Setting
B4-41
ME0384-4A
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Look at the LED status on the front of the CC-Link master and judge whether it is
communicating normally.
No. LED name Applications
1
The operation status will be displayed.
Light ON Normal operation
Light OFF Hardware error or watchdog timer error generated
2
The status of the data link will be displayed.
Light ON Data link in process
Light OFF Data link not executed
3
The data transmission status will be displayed.
Light ON Transmitting data
Light OFF Data not transmitted
4
The data receipt status will be displayed.
Light ON Receiving data
Light OFF Data not transmitted
5
The error status of the master/local unit will be displayed.
Refer to Mitsubishi Electric Co., Ltd. Instruction Manual for error details.
Light ON
One of the following errors has occurred.
· Error was detected in all stations.
· The setting of "station number setting switch" or "transmission speed /
mode setting switch" of the master/local main unit is out of the range.
· The master stations are duplicated on the same network.
· There is an error in the network setting.
· CC-Link cable is disconnected. Or there is influence of noise, etc.
Light OFF Normal operation.
6
The status of the data link error will be displayed
Light ON Data link error has occurred in the local station.
Flashing at
regular
intervals

The setting of the master unit full-surface panel switch on the
right has been changed while the power was turned on.
Flashing at
regular
intervals

Communication is unstable due to the following causes.
· Terminal resistor is not connected. Impacted by noise
Light OFF Normal operation.

indicates blinking. indicate whether or not the master station and standby
master station are in operation as master stations.
CC-Link master unit
↑ Normal communication status
2