Fire Alarm Control Panel IQ8Control C / M
82 FB 798951.10.GB0 / 04.15
Connecting an external device with loop monitoring
Monitored activation of external devices involves monitoring the loop for an end-of-line resistor of 10 k. In the
event of an incident, polarity changes between monitoring and activation voltage at the (relay) connection
terminals. The relay switches over from monitoring the loop to activating the external device.
It is imperative to fit a protective diode (e.g. 1N4004 / 1A) in order to prevent the monitoring current, for example,
from activating external devices while monitoring is in progress.
Example using relay K2 (terminal 5 and 6), monitored mode
K 2
S 1
34
+
-
4
5
6
7
monitoring
V
R
+
-
external device
+
-
4
5
6
7
alarm
V
R
+
-
external device
Fig. 70: Schematic wiring of an external device with loop monitoring
R = 10 k end-of-line resistor.
V= protective diode (e.g. 1N4004/1A), required for an external device if no diode is available in
the external device.
Observe permitted torque (max. 0.4 Nm) of the terminals!
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