Wiring
Ethernet switch in the Ethernet network
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19 | 34
Building Technologies
A6V10407862_d_en_--
Siemens Industry, Inc.
2018-09-07
4.5 Ethernet switch in the Ethernet network
The basic circuit diagram below shows the possible applications of the Ethernet switch
in a redundant Ethernet ring network.
Figure 12: Ethernet switch in a redundant Ethernet ring network
There are 3 types of Ethernet ring wiring, depending on the Ethernet module in use:
● Electric Ethernet with copper wiring via 10/100BaseT connections (RJ-45
connector) with a VN2001 module – max. 330 ft/100 m long
● Optical Ethernet with a fiber-optic 100BaseFX connection in multi-mode version
with a VN2002 module – max. 13100 ft/4 km long
● Optical Ethernet with a fiber-optic 100BaseFX connection in single-mode version
with a VN2003 module – max. 131000 ft/40 km long
The type of ring wiring between each switch is independent and can be selected at will.
A maximum of 32 switches are allowed for each Ethernet ring.
The switch built into an FS20 panel is supplied via the MoNetBus from the
PMI & mainboard. If the switch is built into another housing or device, it is supplied with
power via a 24 V current-limited and supervised power supply that has been approved
for use in fire detection.
MoNet
PMI & Mainboard
Ethernet
Panel
Switch1
P2
P3
P4
P5
P0
P1
P
O
W
E
R
F
A
U
LT
MoNet
Ethernet
Switch2
P2
P3
P4
P5
P0
P1
P
O
W
E
R
F
A
U
LT
MoNet
MoNet
PMI & Mainboard
Ethernet
Panel
Switch xx
P2
P3
P4
P5
P0
P1
P
O
W
E
R
F
A
U
LT
MoNet
Optical or electrical Ethernet Ring
MMS
24V supply
Mo
Net
PM
I&
Mai
nbo
ard
Eth
ern
et
Panel
P2
P3
P4
P5
P0
P1
P
O
W
E
R
F
A
U
LT
MoN
et
SA
FE
DLI
NK
Mo
Net
PM
I&
Mai
nbo
ard
Eth
ern
et
Panel
P2
P3
P4
P5
P0
P1
P
O
W
E
R
F
A
U
LT
MoN
et
SA
FE
DL
IN
K
Switch3
Switch4
