Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 241)

Publication 1756-UM009C-EN-P - December 2010 241
Calibrate the ControlLogix Analog I/O Modules Chapter 11
Calibrating the 1756-IF6CIS or 1756-IF6I Modules
The 1756-IF6CIS module can be used for applications that require current
only. The 1756-IF6I module can be used for applications requiring voltage or
current. Calibrate the modules for your specific application.
Calibrating the 1756-IF6I for Voltage Applications
During 1756-IF6I module calibration, 0.0V and +10.0V external references
are applied consecutively to the module’s terminals. The module records the
deviation from these reference values (that is, 0.0V and +10.0V) 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. The 0/10V user calibration compensates for all voltage
ranges on the 1756-IF6I module (0-10V, +/-10V, and 0-5V) and compensates
for inaccuracies of the module’s entire analog circuitry, including input
amplifier, resistors, and the A/D convertor.
The 1756-IF6I offers 3 input voltage ranges:
• -10…10V
• 0…5V
• 0…10V
Calibrating the 1756-IF6CIS or 1756-IF6I for Current Applications
The 1756-IF6CIS and 1756-IF6I modules offer a 0…20 mA current range.
Calibrating the modules for current uses the same process as calibrating the
1756-IF6I for voltage except the change in input signal.
IMPORTANT
Regardless of what voltage application range is selected prior
to calibration, all voltage calibration uses a +/-10V range.