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2.2 LED Indicators
The descriptions of indications of the LED indicators are given in Table 2-2.
Table 2-2 Descriptions of Indications of LED Indicators
LED
Description of Indication
Name
Indicates the operating status of the
module.
RUN
On: Normal
(green)
Off: Abnormal or power off
Indicates the parameter setting status.
On: Abnormal
PER
Off: Normal
(red)
Indicates participation status in the FA
network.
FLN
On: Participated
(green)
Blinking: Node number error, Protocol
version mismatch
Off: Not participating
Indicates the access status to the
connected I/O.
I/O
On: Accessing
(green)
Off: Not accessing
Blinking: All receiving area update stops
for 500ms or more
Indicates the link test state.
LNT
On: Normal
(green)
OFF: Abnormal
FL654A
RUN FLN LNT
PER I/O
Figure 2-2 LED Indicators
Possible Cause in Details
The cause of turning OFF is as follows.
・ Power is not supplied.
・ Node address is "00" or "FF"
・ Node address overlaps with another node
・ Software is running away
・ Hardware error
The cause of turning ON is as follows.
・ Parameter not set
・ Parameter format error
・ Cyclic transmission area overlaps with
other nodes
The cause of turning OFF is as follows.
・ Parameter abnormal or unset
・ Transmission line fault
The cause of turning OFF is as follows.
・ Power is not supplied.
・ Hardware error.
・ Not connected to the FL-net line or the
RUN/HALT switch is HALT.
The cause of turning OFF is as follows.
・ Transmission line fault
Unified Controller nv Series FL-net Remote I/O Station Module FL654A User's Manual
2.2 LED Indicators
2
Indication
in Normal
Status
ON
(green)
OFF
ON
(green)
ON
(green)
ON
(green)
7
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