Siemens FS720 Mounting & Installation page 157

Building Technologies
Fire Safety
Switching variants for monitored alarm and horn outputs with
decoupled load (EN 54)
X11
FireOutput2-
FireOutput2+
FireOutput1-
FireOutput1+
Figure 85: 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 86: 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.
Installing, exchanging and connecting modules
Example horn output
1
- 8
Rload
Reol
Rcable
+ 7
- 6
+ 5
Example horn output
- 8
Rload
Rcable
+ 7
- 6
+ 5
Module bus cards
2
Example alarm output
Rload
Rcable
* *
Rx
Example alarm output
Rload
Rcable
A6V10210390_j_en_--
2015-12-15
6
Reol
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