Specifications

Theory of Operation
31007715 6/2008 31
115 and 230 VAC
Field Power
Distribution
AC field power is distributed across the island by an STB PDT 2100 PDM. It can
accept field power in the range 85 ... 264 VAC. The following illustration shows a
simple view of 115 VAC power distribution:
1 24 VDC signal to the NIM’s logic power supply
2 115 VAC signal to the segment’s sensor bus
3 115 VAC signal to the segment’s actuator bus
4 optional relay on the actuator bus
Note: In the example above, a single power supply is used to provide 24 VDC to
the NIM (for logic power) and the PDM. If any of the modules supported by the PDM
is an STB relay module that operates at a contact voltage above 130 VAC, the
double insulation provided by the SELV power supply is no longer present.
Therefore, you will need to use a separate 24 VDC power supply to support the
relay module.
NIM
PDM IN IN
OUT
OUT
OUT
P/S
24 VDC
24 V
5.0 V
IN
Logic Power
P/S
VAC
VAC
VAC
VAC
VAC
VAC
VAC
115 VAC
115 VAC
115 VAC
1
2
3
4
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