Stahl YL4IS Series, Operating Instructions Manual, Page: 16 / 21

Mounting and installation
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252160 / YL460300010
2016-02-12·BA00·III·en·00
Intrinsically Safe Combination Signal -
100 dB (A) / LED Beacon
Series YL4IS
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7.3.5 Line monitoring
Standard termination with monitoring resistor fitted.
7.3.6 Sound tone selection (YL4IS D16)
17784E00
• Arrange the settings of the DIP switch using a suitable tool:
• DIP switch "up" corresponds to "1"
• DIP switch "down" corresponds to "0"
Refer to the following tone table for the tone selection.
If line monitoring is required, this can be achieved by using an end-of-line
resistor. For this purpose, use a wire-wound or metal layer resistor with
a resistance value of at least 750 Ohm and a rated power of at least 2 W
or at least 4700 Ohm and a rated power of at least 0.4 W!
The line monitoring facility allows the integrity of the line to the sounder
to be monitored through the barrier to the control system fault detection
and indication circuits. Two sounders of the same type can be connected
in parallel. The resistor can be fitted as per the diagram below.
Line monitoring is optional. The system designer should inform users if this
is necessary or not.
17782E00
R1 Resistor – Value to be defined
by system designer
A 0v
B +v