Siemens FS720 - Page 186

Installing, exchanging and connecting modules
Module bus cards
7
186 | 248
Building Technologies
A6V10210390_m_en_
--
Fire Safety
2018
-
08
-
29
Switching variants for monitored alarm and horn outputs with
decoupled load (EN 54)
Figure 104: Switching examples for monitored alarm and horn outputs with decoupled load (EN 54)
Rload Load resistance
Rcable Line resistance
Reol Termination resistor
1 Standard EOL
2 EOL with decoupled load
Switching variants for monitored alarm and horn outputs with load
resistance monitoring (VdS)
Figure 105: Switching examples for monitored alarm and horn outputs with load resistance monitoring
(VdS)
Rload Load resistance
Rcable Line resistance
Rx Additional load resistance
* If necessary
* Adaptation of the load resistance.
You will find detailed information regarding the determination of the resistances for
the monitored outputs in the document Planning A6V10210362.
Rload
+
-
5
6
FireOutput2-
FireOutput2+ +
-
7
8
FireOutput1-
FireOutput1+
X11
Rcable
Reol
Example horn output
Example alarm output
Reol
Rcable
1
2
Rload
+
-
5
6
FireOutput2-
FireOutput2+ +
-
7
8
FireOutput1-
FireOutput1+
X11
Example horn output
Example alarm output
Rload
Rcable
Rload
Rcable
*
*
Rx