Specifications

Theory of Operation
31007715 6/2008 23
An Illustrative
Example
The illustration below shows an example of a primary segment with PDMs and I/O
modules installed in their bases:
1 The NIM resides in the first location. One and only one NIM is used on an island.
2 A 115/230 VAC STB PDT 2100 PDM, installed directly to the right of the NIM. This module
distributes AC power over two separate field power buses, a sensor bus and an actuator
bus.
3 A set of digital AC I/O modules installed in a voltage group directly to the right of the
STB PDT 2100 PDM. The input modules in this group receive field power from the island’s
sensor bus, and the output modules in this group receive AC field power from the island’s
actuator bus.
4 A 24 VDC STB PDT 3100 PDM, which will distribute 24 VDC across the island’s sensor
and actuator buses to a voltage group of 24 VDC I/O modules. This PDM also provides
isolation between the AC voltage group to its left and the DC voltage group to its right.
5 A set of analog and digital I/O modules installed directly to the right of the STB PDT 3100
PDM.
6 An STB XBE 1000 EOS extension module installed in the last location in the segment. Its
presence indicates that the island bus will be extended beyond the primary segment and
that you are not using a basic NIM.
1 2 4 653
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com