Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 135)

Publication 1756-UM009C-EN-P - December 2010 135
Temperature-measuring Analog Modules (1756-IR6I, 1756-IT6I, and 1756-IT6I2) Chapter 6
Cold Junction Disable Option
The Cold Junction Disable box on the Module Properties Configuration tab
disables cold junction compensation on all module channels. Typically, this
option is used only in systems that have no thermoelectric effect, such as test
equipment in a controlled lab.
In most applications, we recommend that you do not use the cold junction
disable option.
Cold Junction Offset Option
The Cold Junction Offset box on the Module Properties Configuration Tab
lets you make module-wide adjustments to cold junction compensation values.
If you know that your cold junction compensation values are consistently
inaccurate by some level, for example, 1.2 °C (34.16 °F), you can type the value
into the box to account for this inaccuracy.
Improved Module Accuracy
The 1756-IT6I2 offers improved Gain Drift with Temperature and Module
Error over Temperature Range specifications when compared to the
1756-IT6I module. The table highlights the differences.
For a full listing of these module’s specifications, see Appendix A .
Cat. No. Gain Drift with
Temperature
(1)
(1) For a detailed explanation of this specification, see Appendix E .
Module Error over
Temperature Range
(1)
1756-IT6I 80 ppm 0.5%
1756-IT6I2 25 ppm 0.15%