Siemens FS720 Mounting & Installation page 186

Installing, exchanging and connecting modules
7
Module bus cards
186 | 248
Building Technologies
Fire Safety
Switching variants for monitored alarm and horn outputs with
decoupled load (EN 54)
X11
FireOutput2-
FireOutput2+
FireOutput1-
FireOutput1+
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)
X11
FireOutput2-
FireOutput2+
FireOutput1-
FireOutput1+
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.
Example horn output
1
- 8
Rload
Reol
Rcable
+ 7
- 6
+ 5
Example horn output
- 8
Rload
Rcable
+ 7
- 6
+ 5
2
Example alarm output
Rload
Rcable
* *
Rx
Example alarm output
Rload
Rcable
A6V10210390_m_en_--
2018-08-29
Reol