Specifications

Theory of Operation
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The following table lists the way the field-side contacts are implemented on the
different base units.
Base Unit Logic-side Contacts
STB XBA 1000 size 1 I/O base Contacts 7 ... 12 present. Contacts 7 and 12 are
always made. Contacts 8 and 9 are made for input
modules but not for output modules. Contacts 10 and
11 are made for output modules but not for input
modules.
STB XBA 2000 size 2 I/O base Contacts 7 ... 12 present. Contacts 7 and 12 are
always made. Contacts 8 and 9 are made for input
modules but not for output modules. Contacts 10 and
11 are made for output modules but not for input
modules.
STB XBA 2200 size 2 PDM base Contacts 7 and 12 present and are always made.
Contacts 8 ... 11 are not connected on the left side—
sensor and actuator power are delivered to the PDM
from external power sources and passed to the right.
STB XBA 2300 size 2 BOS base Contacts 7 ... 12 present but do not pass signals to the
right. The BOS module does not receive field power.
STB XBA 2400 size 2 EOS base Contacts 7 ... 12 are present but do not pass signals to
the right. The EOS module does not receive field
power.
STB XBA 3000 type 3 I/O base Contacts 7 ... 12 present. Contacts 7 and 12 are
always made. Contacts 8 and 9 are made for input
modules but not for output modules. Contacts 10 and
11 are made for output modules but not for input
modules.
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