Specifications

Theory of Operation
34
31007715 6/2008
Field Power
Distribution
Contacts
The following illustration highlights the contacts at the bottom of the base, which
support the island’s field power distribution functionality:
7 a DIN rail clip that provides functional ground for noise immunity, RFI, etc.
8 and 9 sensor bus
10 and 11 actuator bus
12 PE, established via a captive screw on the PDM base units
STB XBA 2300 size 2 BOS base Contacts 2 ... 6 are present and pass signals to the
right
STB XBA 2400 size 2 EOS base Contacts 1 ... 6 are present but the signals do not pass
to the right
STB XBA 3000 size 3 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
Base Unit Logic-side Contacts
8
9
10
11
12
7
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