Siemens FS720 Quick Reference For Components / Pin Assignment page 25

Building Technologies
Fire Safety & Security Products
1 Cable tree to periphery board or fire terminal board
2 Existing cable tree (connection for master power supply)
3 Additional cable tree for the second power supply (slave)
4 Additional fused terminal (F2) on the top hat rail
Notes
The connection lines marked in bold of the additional cable tree (3) and the
existing cable tree (2) must be wired again when installing the second power
supply source (slave).
In order to avoid ambient temperature differences, the two power supply units
must be mounted next to each other in the same housing.
The batteries and the system supply must only be connected to the master
power supply unit.
Only one temperature sensor must be connected to the master power supply
unit.
The temperature sensor must be fitted close to the batteries. (Precise details
can be found in document A6V10210390, installation).
Power supply (150W) SV 24V-150W
A6V10210410_a_en_--
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18.05.2009