Pin Assignments - Siemens FS720 Mounting & Installation

Installing, exchanging and connecting modules
7
Installing an Ethernet switch (modular) FN2012

7.15.6 Pin assignments

7.15.6.1 'POWER' connector strip
7.15.6.2 'FAULT' connector strip
166 | 248
Building Technologies
Fire Safety
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
B+ B- A- A+
Connector FN2012
POWER
Terminal Plug
+24V
GND
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
F1 OUT
F2 OUT
F3 IN
F4 IN
Admissible cable cross-section: 0.2...2.5 mm²
Supply input
Description
Potential-free relay contact 1 (common, normally
open)
Potential-free relay contact 2 (common, normally
open)
Not connected
Not connected
A6V10210390_m_en_--
2018-08-29