Monitored outputs (I/O card (remote transmission) FCI2007
A1 and I/O card (horn/monitored) FCI2009
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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)
Load Monitoring
RIoad [Ω] UIoad [V] RcableMax. [Ω] Reol Min [Ω] Reol Max [Ω] Peol [W]
>20 <21 1 60 100 12.3
<15 6 100 240 7.4
<10 14.3 200 570 3.7
>50 <21 1.5 50 60 14.8
<15 4.6 50 185 14.8
<10 10.1 50 405 14.8
>100 <21 3 100 119 7.4
<15 9 100 370 7.4
<10 20 100 810 7.4
>1000 <21 30 1000 1190 0.74
<15 92 1000 3700 0.74
<10 200 1000 5500 0.74
>2000 <21 59 2000 2378 0.37
<15 185 2000 5500 0.37
<10 200 2000 5500 0.37
>4000 <21 118 4000 5500 0.18
<15 200 4000 5500 0.18
<10 200 4000 5500 0.18
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