Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules - Manual (Page 140)

140 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Chapter 8 Calibrate the ControlLogix Isolated Analog I/O Modules
Calibrate the 1756-IF8I Module For Voltage Input Type
During voltage calibration, 0.0V and +10.0V external references are applied to
the module’s channels. The module records the deviation from these reference
values and stores it as calibration constants in the module’s firmware.
The internal calibration constants are then used in every subsequent signal
conversion to compensate for circuit inaccuracies, including the input amplifier,
resistors, and the A/D convertor.
The 1756-IF8I offers three input voltage ranges:
• -10…10V
• 0…5V
• 0…10V
Follow these steps to calibrate your 1756-IF8I module.
1. Connect your voltage calibrator to all module channels being calibrated.
2. Go online with your project.
3. Right-click the module you want to calibrate and choose Properties.
IMPORTANT Regardless of the input voltage range selected prior to calibration, all
voltage calibration uses the -10…10V range.