Siemens FS720 - Pin Assignments

Installing, exchanging and connecting modules
Installing an Ethernet switch (modular) FN20
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Building Technologies
A6V10210390_m_en_
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Fire Safety
2018
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08
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29
7.15.6 Pin assignments
7.15.6.1 'POWER' connector strip
The 'POWER' connector is only used if power cannot be supplied via the MoNet
bus or PoE. Generally, this is only the case if the Ethernet switch (modular) is
installed remotely in another device. Power must be supplied via a DC 24 V power
supply unit with a regulated and power-limited output that has been listed for
signaling fire.
Designation Description
A+ Supply input 1 (+DC 24 V)
A- Common supply input 1 (DC 0 V)
B- Not connected
B+ Not connected
Admissible cable cross-section: 0.2…2.5 mm²
7.15.6.2 'FAULT' connector strip
The fault output is a potential-free relay contact which, depending on the
configuration, can be used to report fault conditions by interrupting the contact. If
the FN2012 is switched off, the relay contact is deactivated (opened).
The following error messages can be configured by the web interface:
● 'Fatal fault': Ethernet Switch (modular) malfunction
● 'Ring fault': Ring faults are only indicated if the Ethernet switch (modular) has
assumed the 'Redundancy Manager' function
● 'Ring port fault': 'Link down' state on a ring port
Pin Designation Description
F1 OUT
Potential-free relay contact 1 (common, normally
open)
F2 OUT
Potential-free relay contact 2 (common, normally
open)
F3 IN Not connected
F4 IN Not connected
Admissible cable cross-section: 0.2…2.5 mm²
A+A-B-B+
POWER
+24V
GND
Terminal Plug
Connector FN2012
Supply input