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Bosch Security Systems | 2003-09 | 9922 141 50502en
Plena Message Manager | Installation and Operating Manual | en | 15
3.4 Trigger input connections
Figure 3.4
Message sequences or announcements are started with make contacts (17). These make contacts are connected to
the trigger input screw terminals (11). The cabling of the first six trigger input contacts (1 through 6) can have
supervision by means of a window comparator. Normal operation of these inputs requires two series connected
resistors of 10 kOhm and 3.3 kOhm, permanently connected to the far end of the cable connected to each trigger
input. Triggering occurs by short-circuiting the 10 kOhm resistor as shown in figure 3.4.
Open or short-circuited cables to such an input result in a fault situation that is detected by the window comparator.
The fault indicator LED at the front will light up and the internal fault relay will be unpowered which gives a
contact change on the screw terminals (10) at the rear.
Via the dipswitches 1 through 6 at the rear of the unit supervision of each individual trigger input (1 - 6) can be
enabled ('ON') or disabled ('OFF'). When disabled these inputs act the same as inputs 7 through 12.
Via dipswitch # 7 it is possible to enable mains failure checking. When enabled ('ON') the fault indicator LED at the
front will light up and the internal fault relay will go to the unpowered state upon mains failure, although the unit
may continue to work on the 24 Vdc battery.
When disabled ('OFF') switching between mains and battery operation is automatic and will not be noticed.
Via dipswitch # 8 it is possible to switch ON a 20 kHz pilot tone to the output signal for supervision of the cable by
connecting equipment. The level of the pilot tone is adjustable (from 'OFF' to -14dB with respect to maximum audio
level) via the pilot tone volume control (1). The default volume level is -20 dB.
External settings and connections
+
Pilot Message
Tone
Loop through
Supervision
Pilottone
MsgActive Trigger Input
RS232toLBB1925
RatedInput
Power:50VA
To.5L250V
RS232toPC
WK
S/N
Mains
OFF
NC NO
NO123456 891011127CNC24V
Fault GND
C
ON
TriggerInput1-6
12345678
In
In
Out
Out
LBB 1965/00
8900 196 5005
115V~ 230V~50/60Hz
Apparatusdeliveredconnectedfor
230V~
Thisapparatusmustbeearthed
Warning
1 1110
10kΩ 3.3kΩ
17