Allen-Bradley 1756-IF8I User Manual page 152

Chapter 8 Calibrate the ControlLogix Analog I/O Modules
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4. Make sure that the controller is in Program Mode or the Connection is
Inhibited (available via the Connection tab).
The 1756-IRT8I, 1756-IR12, and 1756-IT16 modules can only be
calibrated when the Connection is Inhibited.
5. On the Calibration tab, click Start Calibration.
6. When the warning appears, click OK.
7. Select the channels to be calibrated and click Next.
The Attach Low Reference Ohms Sources dialog box appears, as shown in
step 9. It indicates the channels are calibrated for a low reference and the
range of the calibration.
Rockwell Automation Publication 1756-UM540E-EN-P - December 2017