ID-E270-011GB
21
5.4 MSL-1M, MSL-2M LINE MODULES
POLON 4900 control panels are permanently equipped with one MSL-1M line module supporting 4
loop-shaped or radial detection lines marked as L1 ÷ L4. Optionally, the control panel can be
furnished with additional MSL-2M module that will support L1 ÷ L4 detection lines. Appropriately
marked detection line clamps are located directly on the MSL-XM module (X stands for 1 or 2
number). The MSL-XM line module is provided for controlling and servicing 4 detection lines to which
the POLON 4000 system addressable elements are attached.
Any addressable detection line can operate as a loop-shaped A type circuit or radial B type one (open
line).
Operation in the loop-shaped circuit enables elimination of one line fault – a line break, and isolation
of a line short circuit between neighbouring addressable elements (all addressable elements are
equipped with short circuit isolators).
The MSL-1M line module is declared permanently, whereas the MSL-2M module, in case it is
installed, is declared automatically (all lines being declared by default as loop-shaped) after the
SETUP execution. In the configuration menu the MSL modules are declared with simultaneously with
the detection line types (loop-shaped, radial) declaration.
It is possible to exchange the MSL-1M module with the MSL-2M (and vice versa) by changing the S1,
S9, S10, S11, S12 jumper positions according to Fig. 5.3 and Fig. 5.4.
The S1 jumper and S9, S10, S11, S12 jumpers that programme the MSL-1M module should always be
in the position shown in Fig. 5.3.
The service diodes, placed on the left edge of the module, enables displaying of general service
states of the main processor and line processors. The line service diodes, located at the back of the
module, enable displaying of the detection lines service states.
The MSL-XM line module contains a microprocessor-based controller circuit with EPROM and RAM
memories, a 5 V power supply unit as well as circuits for co-operation with the PSC-49 central
controller module through the control panel bus. The detection lines are supplied from the +27 V
insulated voltage source, what ensures high immunity to interferences and electric shocks.
The line module also contains monitoring circuits to supervise 27 V DC voltage and earth fault, restart
circuit with a switch and circuit for addressable detection line state signalling, based on illuminating
diodes.
Table 5.2
Line No.
Jumper
Jumper
position
Max. current
[mA]
Max. resistance
[Ω]
L1 (L5)
S21
1-2
1-2
2-3
20
22
50
2 x 100
2 x 75
2 x 45
L2 (L6)
S22
1-2
1-2
2-3
20
22
50
2 x 100
2 x 75
2 x 45
