Installation guide

Site Requirements

890USE17100 September 2003

An Illustrative

Example

The illustration below shows an example of a primary segment with I/O modules

from two voltage groups—DC-powered analog and digital I/O modules and AC-

powered digital I/O modules.

1 The NIM: Always installed in the leftmost location in the primary segment. One and only

one NIM must be used on an island.

2 A 24 VDC PDM: An STB PDT 3100 module, which will distribute 24 VDC across the

island bus to a voltage group of DC I/O modules. The PDM is installed directly to the right

of the NIM.

3 A set of analog and digital DC I/O modules installed directly to the right of the

STB PDT 3100 PDM.

4 A 115/230 VAC PDM: An STB PDT 2100 module installed directly to the left of a voltage

group of AC I/O modules. Notice that this PDM also provides isolation between the AC

voltage group and the DC voltage group that precedes it.

5 A set of digital VAC I/O modules: These modules are installed together in a voltage group

to the right of the STB PDT 2100 PDM, which distributes either 115 or 230 VAC field power

to them and isolates them from the DC voltage group.

6 EOS bus extension module: An STB XBE 1000 module that is installed in the rightmost

location in the primary segment. It enables the island bus to be extended to another

segment of Advantys STB modules or to a preferred module.

Note: The illustration above is of the first segment of an island that contains more

than one segment. Therefore, the required 120 Ω logic termination resistor would

be located beyond it.

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