Fire Detection System Planning Guide

Control terminal B3Q700 (FC/FT)
30
Siemens Building Technologies 007836_a_en_--.doc
Fire & Security Products 03.2004
12.5 Connection lines between control unit and external operating
units
When planning a system the following condition must be complied with:
At least one operating unit must comply with standard EN54, i.e. it must be
equipped with emergency operation and emergency power supply.
EN54 requirements:
 Communication as loop line -> design C-Bus as a loop line
 Operating units also with emergency operation -> 3 additional wires
 Second de-coupled 24V supply -> 3 additional wires or autonomous power
supply
The number of wires in the connection cable depends on the application and the
distances between the stations:
Application C-Bus 24V supply
Emergency power
supply
Emergency opera-
tion circuit
Number of wires
24V supply from
control unit
EN54 complied with
✔
(2 wires)
✔
(3 wires)
✔
(3 wires)
✔
(3 wires)
11
24V supply from
control unit without
emergency operation
and emergency
power supply
✔
(2 wires)
✔
(3 wires)
5
Note:
– Emergency operation circuit required including between CPUs or for a sepa-
rately connected Gateway
– Emergency operation circuit and emergency supply are not designed as a loop
line
– Emergency supply via separate cable or C-Bus feedback
12.6 Power supply (24V)
 Operating unit B3Q700 is designed for the voltage range 18...45VDC
 The maximum current at 24V is 400mA
 Max. Length of line (approximate):
– For cables ø 0.8mm -> 180m
– For cable cross-section 1mm
2
-> 360m
 The current consumption for the options (parallel indicator panel, LON-module)
must be taken into account separately
Control unit FC700A
Options
Control terminal FT700A
2…11
leads
Loop C-Bus
max. 1000m per loop with ∅0,6mm G51 (incl. return line)
max. 1400m per loop with ∅0,8mm G51 (incl. return line)
Control terminal
FT700A
B3R051 (Parallel indicator panel)
E3I040 (LON module)
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