L840/MG4
76
11 4-Detector circuit module L840/MG 4
11.1 General
The 4-fold Detector Circuit Module L840/MG4 provides four detector circuits.
A walk test and set output are provided for control of the motion detectors.
The circuits are ideal for the connection of passive glass break detectors.
The module is supplied as a circuit board and is installed in enclosure
SAD/GUP or SAD/GAP.
A maximum of up to 16 circuit modules L840/MG4
can be managed by the panel.
Regarding the number of detector circuit
modules L240/MG2 or L840/MG4 and bus motion detector modules, it is
important to observe that the total number of detector circuits does not
exceed 80 (incl. the 10 circuits for the panel).
Note:
Only detector circuit modules with firmware version V2.5 or higher can
be connected to the intrusion alarm panel (see label on the processor).
11.2 Circuit diagram
LED
ABB
L840/MG4
Panel tamper
contact with
spring
Address
DIP switch
External Bus (XIB)
+ -
12
V
ou
tput
E
xt
er
n
al s
e
t
Wa
lk
te
st
1 2 3 4 5
ON
LK
1
1
2
+
-
A B
3
4
5
6
7 8 9 10 11 12 13 14 15
+
+
+ - + - + - + -
820
Jumper for
panel tamper
contact
Circuits
The plug-in jumper LK1 is used for bypassing the panel tamper during
commissioning.
LK1 must be removed again after commissioning.
11.3 Description of the inputs and outputs
Terminal
Function
Description
1 (+ 12 V)
2 (0 V)
Output for the supply voltage of detectors
Protected by fuse F1 with 100 mA
+
-
A
B
XIB security bus
Supply v 12 V
0 V
Data line A
Data line B
3(+) and 4(-)
5(+) and 6(-)
7(+) and 8(-)
9(+) and10(-)
Detector circuits, freely programmable
Every detector group in the normal state must be
terminated with 2.7 k
Ω
on the last detector.
A detector
group, which is not used, must be terminated directly on
the module with 2.7 k
Ω
.
11 (+ 12 V)
Output external set
For control of an alarm memory of a motion detector the
+12 V switches via a resistor of 820
Ω
with an externally
set intrusion alarm panel.
13 (+ 12 V)
Walk test output
For control of the walk test of a motion detector the + 12 V
switches via a resistor of 820
Ω
with a walk test.
12, 14 and 15 (0 V)
0 V
0 V potential
Red LED
Fault circuit display
At least one detector group faulty