Specifications
Analog Output Modules
268
31007715 6/2008
STB AVO 1255 Field Wiring
Summary The STB AVO 1255 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 AVO 1255 module handles analog output data from two 0 to 10 V 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 actuators 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 field power 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 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 2 and 5:
Pin Top Connections Bottom Connections
1 +24 VDC from the island’s field power
bus for field device accessories
+24 VDC from the island’s field power
bus for field device accessories
2 no connection no connection
3 output to actuator 1 output to actuator 2
4 output channel return output channel return
5 no connection no connection
6 field power return (to the module) field power return (to the module)
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