Specifications
Analog Input Modules
116
31007715 6/2008
STB ACI 1230 Field Wiring
Summary The STB ACI 1230 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 ACI 1230 module handles analog input data from two 0 to 20 mA single-
ended analog field sensors. Data on each channel has a resolution of 12 bits. 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
to100 mA/channel at 30 degrees C or 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.
Field
Wiring Pinout
The top connector supports analog sensor 1, and the bottom connector supports
analog sensor 2. Four field wires may be used on each connector—on pins 1, 2, 4
and 6.
The connections on pins 1 and 6 are optional, and using these pins will defeat the
built-in isolation between the analog portion of the module and the island’s sensor
bus. No connections are made on pins 3 and 5 of either connector:
Pin Top Connections Bottom Connections
1 +24 VDC from sensor bus for field device
accessories
+24 VDC from sensor bus for field device
accessories
2 input from sensor 1 input from sensor 2
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