Siemens FC700A User Manual

Page of 70
Connection factors, line resistances and capacitances 
39 
Siemens Building Technologies
 
 007836_a_en_--.doc
Fire & Security Products 
 
03.2004
 
 
16.4  Line resistance and capacitance 
 
– 
The max. line resistance of the entire detector loop respectively from the detec-
tor furthest away to each of the two control unit connections must not exceed 
150Ω . 
– 
The entire line from the control unit to the equipment connected and back again 
to the control unit as well as response indicator lines must be included when 
working out capacitance. 
 
DC1192
24VDC
E3M111
AB322A
EB322A
ABI322A
DC1192
DC1192
CB320A
24VDC
DC1192
24VDC
24VDC
max. R
max. C
 
 
Max. Resistance 150Ω (max. R) 
Max. Capacitance 300nF (max. C) -> max. 600nF with max. 50Ω line resistance