Specifications

Analog Input Modules
74
31007715 6/2008
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, 3, 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 2 and 5 of either connector:
The analog returns (pin 4) for each channel are internally connected—therefore
there is no channel-to-channel isolation.
Sample
Wiring Diagrams
The following field wiring example shows how two analog single-ended sensors can
be wired to the STB AVI 1275 module. An external power supply is required to
power the sensors:
3 inputs from sensor 1 (top) and sensor 2 (bottom)
4 returns from input 1 (top) and input 2 (bottom)
Pin Top Connections Bottom Connections
1 +24 VDC from field power bus for field
device accessories
+24 VDC from field power bus for field
device accessories
2 no connection no connection
3 input from sensor 1 input from sensor 2
4 analog input return analog input return
5 no connection no connection
6 field power return (to the module) field power return (to the module)
3
4
3
4
U
+
-
U
+
-
-
+
FE
FE
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