Specifications

Theory of Operation
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The DIN Rail The NIM and the module bases snap onto a conductive metal DIN rail. The rail may
be 7.5 mm or 15 mm deep.
The NIM A NIM performs several key functions:
z It is the master of the island bus, supporting the I/O modules by acting as their
communications interface across the island backplane
z It is the gateway between the island and the fieldbus on which the island
operates, managing data exchange between the island’s I/O modules and the
fieldbus master
z It may be the interface to the Advantys configuration software; basic NIMs to not
provide a software interface
z It is the primary power supply for logic power on the island bus, delivering a
5 VDC logic power signal to the I/O modules in the primary segment
Different NIM models are available to support the various open fieldbuses and
different operational requirements. Choose the NIM that meets your needs and
operates on the appropriate fieldbus protocol. Each NIM is documented in its own
user manual.
PDMs The second module on the primary segment is a PDM. PDMs are available in
different models to support:
z 24 VDC field power to the I/O modules in a segment
z 115 VAC or 230 VAC field power to the I/O modules in a segment
The number of different I/O voltage groups that are installed on the segment
determine the number of PDMs that need to be installed. If your segment contains
I/O from all three voltage groups, you will need to install at least three separate
PDMs in the segment.
Different PDM models are available with scalable performance characteristics. A
standard PDM, for example, delivers actuator power to the output modules and
sensor power to the input modules in a segment over two separate power lines on
the island bus. A basic PDM, on the other hand, delivers actuator power and field
power over a single power line.
The Bases There are six types of bases that can be used in a segment. Specific bases must be
used with specific module types, and it is important that you always install the correct
bases in the appropriate locations in each segment:
Base Model Base Width Advantys STB Modules It Supports
STB XBA 1000 13.9 mm (0.54 in) the size 1 base that supports 13.9 mm wide I/O
modules (24 VDC digital I/O and analog I/O)
STB XBA 2000 18.4 mm (0.72 in) the size 2 base that supports 18.4 mm I/O modules
and the STB XBE 2100 CANopen extension module
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