Specifications

Theory of Operation
20
31007715 6/2008
Island Segments
Summary An Advantys STB system starts with a group of interconnected devices called the
primary segment. This first segment is a mandatory piece of an island. Depending
on your needs and on the type of NIM you are using (see p. 18), the island may
optionally be expanded to additional segments of Advantys STB modules, called
extension segments and to non-STB devices such as preferred modules and/or
standard CANopen devices.
The Primary
Segment
Every island bus begins with a primary segment. The primary segment consists of
the island’s NIM and a set of interconnected module bases attached to a DIN rail.
The PDMs and Advantys STB I/O module mount in these bases on the DIN rail. The
NIM is always the first (leftmost) module in the primary segment.
The Island Bus The bases that you interconnect on the DIN rail form an island bus structure. The
island bus houses the modules and supports the communications buses across the
island. A set of contacts on the sides of the base units (see p. 33) provides the bus
structure for:
z logic power
z sensor field power to the input modules
z actuator power to the output modules
z the auto-addressing signal
z island bus communications between the I/O and the NIM
The NIM, unlike the PDMs and I/O modules, attaches directly to a DIN rail:
1 NIM
2 module bases
3 termination plate
4 DIN rail
1
2
3
4
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