Siemens OH720 Technical Manual page 48

4BMounting / Installation
5
34BDetector lines
1 Control panel
2 Detector base DB72x, sounder base DBS720
3 Auxiliary terminal DBZ1190-xx
4 External alarm indicator
48 | 64
Building Technologies
Fire Safety
C-NET connection diagram
–
+
2
1a 1b
1
5 6
+
3
–
5 6
Figure 12: Connection diagram for addressed detector lines
The alarm indicator connected will continue to function correctly in the event of a
short-circuit occurring at position '7' on the connection diagram. The alarm indicator
is triggered by cable –EAI6.
If the short-circuit occurs at position '8' on the connection diagram, the alarm
indicator will no longer be triggered.
As an option, the alarm indicator may also be connected using cable -EAI5.
In this case, the alarm indicator will correctly indicate an alarm even if a short-
circuit occurs at position '8'.
This ensures that the alarm indicator is always functioning correctly.
The option described is possible in loops and stub lines!
You will find more detailed information in the fire detection system documentation.
2
1a 1b
8
5 6
+
–
5 6
–
+
2
1a 1b
5 6
3
5 Cable –EAI6
6 Cable –EAI5 (optional)
7 Short circuit (error)
8 Short circuit (error)
2
1a 1b
+
7
5 6
–
4
2
1a 1b
5 6
3
4
4
A6V10212047_m_en_--
2015-05-04