Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 67)

Publication 1746-UM008B-EN-P - December 2006
Channel Configuration, Data, and Status 67
Input Type Selection (Bits 0…3)
The input type bit field lets you configure the channel for the type of
input device you have connected to the module. Valid input devices
are shown in the Channel Configuration Word (O:e.0 through O:e.3) -
Bit Definitions table.
Data Format Selection (Bits 4 and 5)
The data format bit field lets you define the format for the channel
data word contained in the module input image. Valid data types are
engineering units, scaled-for-PID, and proportional counts. If you
select proportional counts, you have the option of using user-set
scaling bits 13 and 14 (Table Channel Configuration Word (O:e.0
through O:e.3) - Bit Definitions) to define an optimum range for your
application. Unless you specify otherwise, the data will be scaled to
the full scale range for that channel.
Bit Descriptions for Data Format Select
Binary
Value Select Description
00 Engineering units x 1 Expresses values in 0.1 ° or 0.1
Ωfor 150 Ωpot.,
only.
01 Engineering units x10 Express values in 1 ° or 1 Ω or 0.1 Ωfor 150 Ωpot.
only.
10 Scaled-for-PID The input signal range for the selected input type
is its full scale input range. The signal range is
scaled into a 0…16,383 range, which is what the
SLC processor expects in the PID function.
11 Proportional counts The input signal range is proportional to your
selected input type and scaled into a
-32,768…32,767 range (default) or user-set range,
based on the scaling select bits (13 and 14) an
scale limit words (O:e.4/O:e.5 or O:e.6/O:e.7).