ALRS and ALR Module SWT 3000 Equipment Manual
Page - 4 Edition p3_3_2x 08/09 © SIEMENS AG 2008
X3
SYNC
A1
C3
A14
SYNC
1
2
3
Figure 2: Block diagram of the binary input
The binary input is also active low. Electrical isolation is provided by means of optocouplers. The
operating point is between about 15V (0-15V “Off“ state, 20-250V “On“) and about 54V (0_50V
“Off“ state, 60-250V “On“ state) settable by a link.
Supply voltages
The ALRS module needs the following supply voltages:
+12V
+5V
In the SWT 3000 unit the power supply is generally interrupted by an inhibit line when a module is
pulled. The ALRS does not have an Inhibit line so that the equipment can also be operated for test
purposes with the module pulled.
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