Schneider Electric 890USE17700 - Manual (Page 16)

Introduction
16 890USE17700 April 2004
Extension
Segments When you are using a standard NIM, Advantys STB I/O modules that do not reside
in the primary segment can be installed in extension segments. Extension segments
are optional segments that enable an island to be a truly distributed I/O system. The
island bus can support as many as six extension segments.
Special extension modules and extension cables are used to connect segments in
a series. The extension modules are:
z
the STB XBE 1000 EOS module, which is the last module in a segment if the
island bus is extended
z the STB XBE 1200 BOS module, which is the first module in an extension
segment
The BOS module has a built-in 24-to-5 VDC power supply similar to the NIM. The
BOS power supply also provides 1.2 A of logic power to the STB I/O modules in an
extension segment.
Extension modules are connected by lengths of STB XCA 100x cable that extend
the island communication bus from the previous segment to the next BOS module:
1 primary segment
2 NIM
3 STB XBE 1000 EOS bus extension module
4 1 m length STB XCA 1002 bus extension cable
5 first extension segment
6 STB XBE 1200 BOS bus extension module for the first extension segment
7 another STB XBE 1000 EOS extension module
8 4.5 m length STB XCA 1003 bus extension cable
9 second extension segment
10 STB XBE 1200 BOS bus extension module for the second extension segment
11 STB XMP 1100 termination plate
Bus extension cables are available in various lengths, ranging from 0.3 m (1 ft) to
14.0 m (45.9 ft).
1
2 3
5
4
6 7
9
8
10 11