4-6
Chapter 4. Functions
4 - 2 AI (Analog Input)
A maximum of 4 analog input points can be implemented. The following is a functional block diagram for analog
input.
For thermocouple For RTD For DC voltage/current
Range type Range type Range type
Scaling
Alarm low and high limits
Ratio
Bias
Linear approximation
Filter
Low and high limits
PV
(A4, B4, A3, or B3 block)
PV assignment based on
loop type
RSP assignment based on
loop type
PV Hold
PV
(Loops 1 to 4)
RSP
(Loops 1 to 2)
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