Siemens FS20 Planning Manual page 136

Defining controls
9
Monitored outputs (I/O card (remote transmission) FCI2007-A1 and I/O card (horn/monitored) FCI2009-A1)
Load
RIoad [Ω] UIoad [V]
>20 <21
<15
<10
>50 <21
<15
<10
>100 <21
<15
<10
>1000 <21
<15
<10
>2000 <21
<15
<10
>4000 <21
<15
<10
136 | 242
Building Technologies
Fire Safety
Dimensioning of load decoupled with diode (EN 54)
Use the dimensioning table to determine the following:
● RcableMax
● The range for the Reol along with its power
Example from dimensioning table 1
● For Rload >50 ohm
● RcableMax = 1.5 ohm
● Reol = 50...60 ohm
● Peol = 14.8 W
To reduce the required power dissipation of Reol to 0.25 W, Reol can be
decoupled with an additional diode D2.
Make sure the dimensioning is correct:
● For the reverse voltage and power dissipation in the case of diode D2. The
Schottky diode 1N5819 is recommended (maximum diode reverse voltage
>30 V). The maximum permissible resistance Reol is 3000 ohm with diode D2.
The absolute measurement accuracy is influenced. This has no effect on the
monitoring accuracy.
● For the power dissipation and forward current in the case of load decoupling
diode D1. Recommended depending on the power range: e.g., MBR760 for
Rload <1000 ohm and, e.g., 1N4448 for Rload >=1000 ohm
Dimensioning table for monitored alarm and horn outputs with
decoupled load (EN 54)
Monitoring
RcableMax. [Ω]
1
6
14.3
1.5
4.6
10.1
3
9
20
30
92
200
59
185
200
118
200
200
Reol Min [Ω] Reol Max [Ω]
60 100
100 240
200 570
50 60
50 185
50 405
100 119
100 370
100 810
1000 1190
1000 3700
1000 5500
2000 2378
2000 5500
2000 5500
4000 5500
4000 5500
4000 5500
Peol [W]
12.3
7.4
3.7
14.8
14.8
14.8
7.4
7.4
7.4
0.74
0.74
0.74
0.37
0.37
0.37
0.18
0.18
0.18
008843_v_en_--
2015-12-15