Andover Controls UI-8-10 - Page 28

22 Andover Controls
Input Circuitry
UI-8-10 Inputs are essentially voltmeters. Universal inputs can be configured through
software to become one of five different input circuits:
♦
Temperature
♦
Voltage
♦
Digital
♦
Counter
During configuration, the value of the Electrical Type attribute you select tells the
controller how to interpret the reading from each input. Each Universal input is read every
100 milliseconds. This reading is independent of the controller scan time.
The following is a simplified schematic of both the UI-8-10 and the UI-8-10-10V Universal
inputs:
The main difference between the two is the UI-8-10-10V circuit includes a switch
selectable front-end voltage divider that effectively divides the 10V input signal by two.
IN x
Vref
Rref
Swdis
RET
UI-8-10
UI-8-10-10V
IN x
Vref
Rref
Swdis
RET
2.21K
2.21K
0-10V
0-5V
Range
UI-8-10
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