Rockwell Automation 1746-NT4 Series B,D17466.6.1 SLC 500 4-Channel Thermocouple/mV Input Module User Manual - Manual (Page 58)

Publication 1746-UM007C-EN-P - July 2004
5-6 Channel Configuration, Data, and Status
Using Scaled-for-PID and Proportional Counts
The thermocouple module provides eight options for displaying input
channel data. These are 0.1°F, 0.1°C, 1°F, 1°C, 0.01 mV, 0.1 mV,
Scaled-for-PID, and Proportional Counts. The first six options
represent real Engineering Units provided/displayed by the 1746-NT4,
and do not require explanation. The Scaled-for-PID and Proportional
Counts selections provide the highest NT4 display resolution, but also
require you to manually convert the channel data to real Engineering
Units.
The equations on page 5-7 show how to convert from Scaled-for-PID
to Engineering Units, Engineering Units to Scaled-for-PID,
Proportional Counts to Engineering Units, and Engineering Units to
Proportional Counts. To perform the conversions, you must know the
defined temperature or millivolt range for the channel’s input type.
Refer to the Channel Data Word Format table on page 5-9. The lowest
possible value for an input type is SLOW, and the highest possible
value is SHIGH.