Siemens FS20 - Page 139

Defining con
trols
Monitored outputs (I/O card (remote transmission) FCI2007
-
A1 and I/O card (horn/monitored) FCI2009
-
A1)
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242
Building Technologies
008843_v_en_
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Fire Safety
2015
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12
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15
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 Monitoring
RIoad [Ω] UIoad [V] RcableMax. [Ω]
>150 <21 1.6
<15 62
>1000 <21 10
<15 200
>2000 <21 21
<15 200
>4000 <21 43
<15 200
Table 38: Dimensioning table for monitored fault output
RIoad Load resistance [Ω]
UIoad Load voltage (Minimum) [V]
RcableMa
x.
Maximum permitted cable resistance [Ω]