
B-64164EN/01 MAINTENANCE 1.HARDWARE MAINTENANCE INFORMATION
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LED1, LED2, LED3, and LED4 indications (when abnormality occurs)
The STATUS LEDs are turned on and off repeatedly with long
on-time and short on-time.
LED
indication
[Long on-time]
4 3 2 1
LED
indication
[Short on-time]
4 3 2 1
Status Description
Error on another
board
A defect on another board or a problem on another
board was detected.
Bus error Software has a problem, or the board is defective.
Parity alarm The board is defective.
Illegal general
instruction
Software has a problem, or the board is defective.
Illegal slot instruction Software has a problem, or the board is defective.
CPU address error Software has a problem, or the board is defective.
NOTE
If an error occurs with the LEDs turned on and off
with long on-time and short on-time in a manner
not indicated above, contact FANUC.
COL, LIL, and ALM LED indications (when abnormality occurs)
LED indication Status Description
COL ■
COL ☆
Collision occurs.
(Data collision occurs.)
When a data collision occurs on the
network, the LED is lit or blinks.
(Note)
LIL □
Not connected to hub The board is not connected to the hub
properly. The LIL LEF stays off also when
the power to the hub is off.
Check whether the board is connected to
the hub properly.
ALM ■
(HER)
Parity error occurs. A parity error occurred in memory on the
board. The board is defective.
NOTE
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.
In such a case, check the devices connected to the
network and the network installation status.