Safety Features; Fln Trunk Connections Check - Siemens 125-2134 Owner's Manual

Differential Pressure Monitor Owner's Manual

Safety Features

The circuit board stores the DPM's address, applications, and selected point values. In the
event of a power failure or a reset, these values are retrieved from the DPM's permanent
memory and are used by the DPM unless overridden by a field panel.

FLN Trunk Connections Check

If the monitor connects to a field panel via a Floor Level Network (FLN), make sure that the
wiring is properly terminated at both the field panel and the monitor's FLN trunk terminal
blocks (Figure 4). The wires should not be shorted or loosely connected. Maintain proper
FLN trunk polarity: + to +; – to –. Verify that the shields are properly terminated.
NOTE:
It is normal for the RX LED to be steadily illuminated if there is not an FLN trunk connected to
the controller or the field panel.
20
If the FLN Trunk wiring is reversed, the monitor's RX LED will remain steadily
illuminated.
Figure 4. FLN Trunk Wiring.
FLN TRUNK
-
+ S
PIN # 1 2 3
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