Emergency operation
18
Siemens Building Technologies 007831_a_en_--.doc
Fire & Security Products 03.2004
The number of wires in the connection cable depends on the application:
a) Are control consoles supplied from the control unit with 24V?
b) Is an emergency power supply also provided according to EN54?
c) Is the emergency operation circuit also provided?
Application C-Bus 24V supply Emergency
supply
Emergency
operation
circuit
Number of
wires
24V supply from control unit
Complies with EN54
X (2 wires) X (3 wires) X (2 wires) X (3 wires) 10
24V supply from control unit
without emergency opera-
tion / emergency power
supply
X (2 wires) X (3 wires) - - 5
Note:
– Emergency operation circuit also required between other CPUs
– Emergency operation circuit and the emergency power supply are not laid out as a loop line
– Route emergency power supply in a separate cable or in the C-Bus cable feedback
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