
1.HARDWARE MAINTENANCE B-63434EN/02
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LED indication during normal operation
No. LED indication Communication status
1
ROS ☆
Blinks at 1-second intervals when the
communication software on the FL-net board
operates normally.
2
RES □
Normally, off
3
LNK ■
Turned on when the node participates in the FL-
net network
4
POK ■
Turned on when all FL-net parameters are valid.
LED indication for communication status
No. LED indication Communication status
1COM Turned on when data is transmitted or received
2LIL Turned on when the connection with the hub is
normal
3COL Turned on when a data collision occurs
NOTE
COL: The FL-net manages the token-based
transmission right so that no collision occurs. If
this LED is turned on frequently, a
communication error has occurred due to noise,
or an Ethernet compliant product other than the
FL-net is connected.