Fiber-Optic Network Module Fn2006 / Fn2007 Troubleshooting Steps - Siemens FS720 Commissioning, Maintenance, Troubleshooting

24.12 Fiber-optic network module FN2006 / FN2007
Item Pwr RX1 Fail1 EF1
x
Node 1 / line 1
1 ON ON OFF OFF
2 ON OFF ON
3a ON OFF ON
3b ON ON OFF OFF
4 OFF OFF OFF OFF
5 ON ON OFF ON
6 ON ON OFF OFF
7 ON ON OFF OFF
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Fiber-optic network module FN2006 / FN2007 troubleshooting steps

troubleshooting steps
Faults on a specific line can be located by referring to the LED indicators and the
table below.
The following fault scenarios are examples that relate to node1, line1 and node2,
line2. Faults on the copper side concern line1 within node1, for example.
LNK1 Possible cause
Normal operation
FLS
HG
OFF OFF Optical fibers wrong way round
OFF OFF Break in optical fiber RX1
OFF Break in optical fiber RX2
OFF Energy supply interrupted
Ground fault at A1/B1
FLS
2
HG
OFF A1/B1 wrong way round
OFF Break in A1 or B1
Table 9: Searching for faults on fiber optic cable network module based on LED status
Depending on which module with a fully intact supply is connected, RX1 / RX2
1
is OFF, and Fail1 or Fail2 is ON.
In the event of a ground fault, LED EF1 lights up and LED EF2 flashes (to
2
indicate that the ground fault is being forwarded).
Legend for LED patterns
LED OFF
LED ON, in relevant color
LED flashing [FLSHG], in relevant color
Repair
LNK2 EF2 Fail2 RX2 Pwr x
Node 2 / line 2
OFF OFF ON
FLSH
G
OFF ON OFF ON
FLSH
G
OFF OFF OFF ON
OFF OFF ON OFF ON
FLSH OFF ON OFF
1
G
1
OFF OFF ON
FLSH
G
OFF OFF ON
FLSH
G
FLSH OFF OFF ON
G
A6V10210416_j_en_--
24
ON
ON
ON
ON
ON
ON
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2018-08-29