Siemens FS20 Planning Manual page 139

Monitored outputs (I/O card (remote transmission) FCI2007-A1 and I/O card (horn/monitored) FCI2009-A1)
Building Technologies
Fire Safety
Planning steps
1. Determine the load resistance that will be connected at the output (Rload),
e.g. sounder DS10: Rload = 24 V/0.42 A = 57.2 ohm
2. Define the minimum required voltage of the sounder (Uload), e.g. datasheet
DS10: U = 19...29 V -> Uload = 19 V
3. In the dimensioning table, find the row that corresponds to these values and
determine the associated values.
The monitored resistance value must be within the range for the monitoring
resistance, otherwise a fault message will be displayed at the ↑ station. You will
find detailed information about this in document Product data 008837.
Dimensioning of load for monitored fault output
Use the dimensioning table to determine the following:
● RcableMax
Example from dimensioning table 1
● For Rload >40 ohm
● RcableMax = 6 ohm
For the Rx and diode, make sure the dimensioning is correct (maximum power
dissipation, maximum diode reverse voltage >30 V, etc.).
Dimensioning table for monitored fault output
Load
RIoad [Ω]
>150
>1000
>2000
>4000
Table 38: Dimensioning table for monitored fault output
RIoad Load resistance [Ω]
UIoad Load voltage (Minimum) [V]
Maximum permitted cable resistance [Ω]
RcableMa
x.
UIoad [V]
<21
<15
<21
<15
<21
<15
<21
<15
Defining controls
9
Monitoring
RcableMax. [Ω]
1.6
62
10
200
21
200
43
200
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2015-12-15