Siemens FS20 - Monitored Fault Output

Defining controls
Monitored outputs (I/O card (remote transmission) FCI2007
-
A1 and I/O card (horn/monitored) FCI2009
-
A1)
9
138 | 242
Building Technologies
008843_v_en_
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Fire Safety
2015
-
12
-
15
Dimensioning table for monitored alarm and horn outputs with load
resistance monitoring (VdS)
Load Monitoring
RIoad [Ω] UIoad [V] RcableMax. [Ω]
>40 <21 6
<15 24
>100 <21 14
<15 60
>1000 <21 148
<15 200
>2000 <21 200
<15 200
Table 37: Dimensioning table 2 for monitored alarm and horn outputs with load resistance monitoring
(VdS)
RIoad Load resistance [Ω]
UIload Load voltage (Minimum) [V]
RcableMax. Maximum permitted cable resistance [Ω]
Loads of less than 40 Ω cannot be monitored as part of load resistance
monitoring.
9.1.3 Monitored fault output
The connection type with monitored fault output has the following features:
● Monitoring is carried out in an active and inactive status with normal polarity.
● The monitored fault output connection is identical to the load resistance
monitoring connection. Only the Rload and RcableMax values are different.
If the resistance is not linear and is high (e.g. in the case of electronic loads such
as sounders and beacons), the monitoring resistance must be defined using a
dominant Rx. A freewheeling diode should also be used for inductive loads.
Figure 61: Monitored fault output connection
1
Optional load resistance as well as optional freewheeling diode for inductive load
-
Rload
FCI2007
FCI2009
Rcable
+
Uload
Rx
1
1