Specifications
Analog Output Modules
324
31007715 6/2008
STB ACO 1225 Field Wiring
Summary The STB ACO 1225 module uses two six-terminal field wiring connectors. Analog
actuator 1 is wired to the top connector, and the analog actuator 2 is wired to the
bottom connector.
Connector Types 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 Actuators The STB ACO 1225 module handles analog output data from two 4 to 20 mA single-
ended analog field actuators. Data on each channel has a resolution of 10 bits. The
module allows you to connect to two-, three- and four-wire devices that can 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 actuator 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 wire 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.
Field
Wiring Pinout
The top connector supports analog actuator 1, and the bottom connector supports
analog actuator 2. Four field wires may be used on each connector—on pins 1, 2, 4
and 6.
The connections on pin 1 and pin 6 are optional, and using them defeats 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 actuator bus for field
device accessories
+24 VDC from actuator bus for field
device accessories
2 output to actuator 1 output to actuator 2
3 no connection no connection
4 output channel return output channel return
5 no connection no connection
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