Specifications

Power Distribution Modules
372
31007715 6/2008
STB PDT 3100 LED Indicators
Overview The two LEDs on the STB PDT 3100 are visual indications of the presence of sensor
power and actuator power. The LED locations and their meanings are described
below.
Location The two LEDs are located on the top front bezel of the module, directly below the
model number:
Indications The following table defines the meaning of the two LEDs (where an empty cell
indicates that the pattern on the associated LED doesn’t matter):
IN OUT Meaning
on sensor (input) field power is present
off The module either:
z is not receiving sensor field power
z has a blown fuse
z has failed
on actuator (output) field power is present
off The module either:
z is not receiving sensor field power
z has a blown fuse
z has failed
Note: The power required to illuminate these LEDs comes from the 24 VDC power
supplies that provide the sensor bus and actuator bus power. These LED indicators
operate regardless of whether or not the NIM is transmitting logic power.
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