Rockwell Automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Module - Manual (Page 45)

Publication 1769-UM019A-EN-P - October 2008 45
Module Data, Status, and Channel Configuration Chapter 3
Input Type/Range Selection
This selection lets you configure each input channel individually and
provides the ability to read the configured range selections.
Input Data Selection Formats
This selection configures each input channel to present analog data in
any of the following formats:
•
Raw/Proportional Data
•
Engineering Units
•
Scaled-for-PID
•
Percent Range
See Valid Input Data on page 46 .
Raw/Proportional Data
The value presented to the controller is proportional to the selected
input and scaled into the maximum data range allowed by the bit
resolution of the A/D converter. For example, the data value range for
a ±10V DC user input is -32,766…32,766, which covers the full-scale
range of -10.5…10.5V.
Engineering Units
The module scales the analog input data to the actual current or
voltage values for the selected input range. The resolution of the
engineering units is 0.001V or 0.001 mA per count.
Scaled-for-PID
The value presented to the controller is a signed integer with 0
representing the lower limit of the normal operating range and 16,383
representing the upper limit of the normal operating range.
Allen-Bradley controllers, such as the MicroLogix 1500 controller, use
this range in their PID equations. The amount over and under the
normal operating range (the full-scale range) is also supported.