Specifications
Analog Output Modules
31007715 6/2008 251
STB AVO 1250 Field Wiring
Summary The STB AVO 1250 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. The choices of connectors and field wire types are described
below, and some field wiring options are presented.
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 AVO 1250 module handles analog output data from two 0 to 10 V or +/-
10 V single-ended analog field actuators. Data on each channel has a resolution of
12 bits or 12 bits plus sign. The module is designed to support high duty cycles and
to control continuous-operation equipment.
The module allows you to connect to two-, three- and four-wire devices that can
draw current up to 100 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 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 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 actuator 1, and the bottom connector supports
analog actuator 2. Four field wires may be used on each connector—on pins 1, 3, 4
and 6.
The connections on pin 1 and pin 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 2 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
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