Specifications

Analog Input Modules
31007715 6/2008 73
STB AVI 1275 Field Wiring
Summary The STB AVI 1275 module uses two six-terminal field wiring connectors. Analog
sensor 1 is wired to the top connector, and analog sensor 2 is wired to the bottom
connector.
Connectors Use a set of either:
z two STB XTS 1100 screw type field wiring connectors (available in a kit of 20)
z two STB XTS 2100 spring clamp field wiring connectors (available in a kit of 20)
These field wiring connectors each have six connection terminals, with a 3.8 mm
(0.15 in) pitch between each pin.
Field Sensors The STB AVI 1275 module handles analog input data from two +/-10 V single-ended
analog field sensors. Data on each channel has a resolution of 9 bits plus the sign
bit. The module supports two-, three- and four-wire devices that draw current up to
100 mA/module.
If you want to maintain the module’s built-in isolation between the analog portion of
the module and the island’s sensor bus, you can make only two-wire connections.
Field Wire
Requirements
Individual connector terminals accept one field wire. Use wire sizes in the range
0.5...1.5mm
2
(24 ... 16 AWG).
Shielded twisted-pair cable is recommended. The shield should be tied to an
external clamp that is tied to functional earth.
We recommend that you strip at least 9 mm from the wire’s jacket for the module
connection.
Note: An open circuit in the input cabling causes a voltage with an indeterminate
value to be reported.
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