Siemens FC700A User Manual

30 

Siemens Building Technologies

 

 007836_a_en_--.doc

Fire & Security Products 

 

03.2004

 
 

 

 

 
 
 
 
 
 
 
 
 
 

 
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. 

 

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: 
 

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 

 

 

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 

2…11 
leads 

max. 1000m per loop with ∅0,6mm G51 (incl. return line) 
max. 1400m per loop with ∅0,8mm G51 (incl. return line) 

B3R051 (Parallel indicator panel) 
E3I040 (LON module) 
Printer