Siemens FS720 Commissioning, Maintenance, Troubleshooting page 166

Repair
24
Fiber-optic network module FN2006 / FN2007 troubleshooting steps
Node 1
Line1
A1
B1
Line2
A2
B2
A1 B1 A2 B2
H3 H2
H1
FN2001
Node 1
Line1
A1
B1
Line2
A2
B2
A1 B1 A2 B2
H3 H2
H1
FN2001
166 | 178
Building Technologies
Fire Safety
1 Normal condition
FN2006/FN2007
RX1
Link1
EF1
Fail1
Fault example zone
Fail2
EF2
Link2 RX2
A Power B
VsysA
Figure 11: Normal condition
2 Optical fibers wrong way round
FN2006/FN2007
Link1 RX1
EF1
Fail1
Fail2
EF2
Link2 RX2
A Power B
VsysA
Figure 12: Optical fibers wrong way round
In addition, the following light up on the affected lines: fault indicators H2 / H3 on
the FN2001 network modules.
FN2006/FN2007
Link2
RX2
Line2
A2
EF2
B2
Fail2
Fail1
Line1
A1
EF1
B1
RX1 Link1
B Power A
VsysA
FN2006/FN2007
Link2
RX2
Line2
A2
EF2
B2
Fail2
Fail1
Line1
A1
EF1
B1
RX1 Link1
B Power A
VsysA
A6V10210416_j_en_--
Node 2
B1 A1 B2 A2
H2
H3
H1
FN2001
Node 2
B1 A1 B2 A2
H2
H3
H1
FN2001
2018-08-29