Rockwell Automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Module - Manual (Page 56)

56 Publication 1769-UM019A-EN-P - October 2008
Chapter 3 Module Data, Status, and Channel Configuration
Output Data Selection Formats
This selection configures each output channel to accept digital data in
any of the following formats:
•
Raw/Proportional Data
•
Engineering Units
•
Scaled-for-PID
•
Percent Range
See Valid Output Data on page 57 .
Raw/Proportional Data
The value sent by the controller to the output channel is proportional
to the selected output and scaled into the maximum data range
allowed by the bit resolution of the D/A converter. For example, the
data value range for a ±10V DC user input is -32,764…32,764, which
covers the full-scale range of -10.5…10.5V.
Engineering Units
The value sent by the controller to the output channel is the actual
current or voltage value for the selected output range. The resolution
of the engineering units is 0.001V or 0.001 mA per count.
Scaled-for-PID
The value sent by the controller to the output channel is a signed
integer with 0 representing the lower limit of the normal operating
range and 16,380 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.
Percent Range
The value sent by the controller to the output channel is presented as
a percentage of the normal operating range selected for that output
channel. For example, 0…10V DC equals 0…100%. The resolution of
the percent range is 0.01% per count. The amount over and under the
normal operating range (the full-scale range) is also supported.