Specifications

Analog Input Modules
56
31007715 6/2008
STB AVI 1270 Field Wiring
Summary The STB AVI 1270 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. The choices of connectors and field wire types are described below, and
some field wiring options are presented.
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 1270 module handles analog input data from two +/-10 V single-ended
analog field sensors. Data on each channel has a resolution of 11 bits plus the sign
bit. The module is designed to support high duty cycles and to control continuous-
operation equipment.
The module supports two-, three- and four-wire devices that draw current up to:
z 100 mA/channel at 30 degrees C
z 50 mA/channel at 60 degrees C
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 protective 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 will cause a voltage with an indeterminate
value to be reported.
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