Specifications

Theory of Operation
31007715 6/2008 33
Communications Across the Island
Island Bus
Architecture
Two sets of contacts on the left side of the base units—one set on the bottom and
one on the top—enable the island to support several different communication and
power buses. The contacts on the top left of a base support the island’s logic side
functions. The contacts at the bottom left of a base support the island’s field power
side.
Logic Side
Contacts
The following illustration shows the location of the contacts as they appear on all the
I/O bases. The six contacts at the top of the base support the logic side functionality:
1 reserved
2 common ground contact
3 5 VDC logic power contact
4 island bus communications (+) contact
5 island bus communications (-) contact
6 address line contact
The following table lists the way the logic-side contacts are implemented on the
different base units.
Base Unit Logic-side Contacts
STB XBA 1000 size 1 I/O base Contacts 2 ... 6 present and pass signals to the right.
Contacts 2 and 3 terminate at the end of the segment;
contacts 4, 5 and 6 pass to the end of the island bus.
STB XBA 2000 size 2 I/O base Contacts 2 ... 6 present and pass signals to the right.
Contacts 2 and 3 terminate at the end of the segment;
contacts 4, 5 and 6 pass to the end of the island bus
STB XBA 2200 size 2 PDM base Contacts 2 ... 6 present and pass signals to the right.
Contacts 2 and 3 terminate at the end of the segment;
contacts 4, 5 and 6 pass to the end of the island bus
4
5
6
3
2
1
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