Structure and function
Input/output configuration options (secondary side)
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Building Technologies
009122_h_en_--
Fire Safety
2016-05-04
3.4.2.3 Detector line design
Permissible cable types
The detector line is compatible with the following cables:
Shielded cables
Unshielded cables
The table below shows the permissible cable values:
Cable value
Detector line without
safety barrier SB3
Detector line with safety
barrier SB3
Inductance
Max. 5 mH
Max. 1.6 mH
Capacitance
Max. 4 µF
Max. 83 nF
Resistance
Max. 150
Max. 50
End-of-line (EOL)
One of the following must be used to terminate the detector line:
Bidirectional 20 V voltage reference diode (max. tolerance ±5 %); 1.5 kW pulse
power
EOL22(Ex); absolutely essential with intrinsically safe ex detectors on ex lines
above safety barrier SB3!
Non-assigned inputs/outputs do not require an end-of-line (EOL).
Monitoring of detector lines
The input/output module monitors the line resistance of the detector line during
operation.
The line resistance is adjusted precisely in each of the following cases:
On initial start-up
When an alarm has been reset
Whenever the detector line is switched on
Circuit
A maximum of 32 detectors can be connected (KMK = 32).
Figure 6: Detector line circuit
Recommendation: Install a 100 mAT fuse as shown in the graphic on collective
and conventional detector lines to protect the EOL element from commissioning
errors.
EOL
+
I/O
FDCIO223
100 mAT
