Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules - Manual (Page 124)

Publication 1794-6.5.8 - January 2010
122 Calibrating Your Module
Offset Calibration for Inputs
Refer to the input timing diagram when calibrating the module.
Normally all inputs are calibrated together. To calibrate the offset,
proceed as follows:
1. The module must be calibrated in an operating system. Connect
your module in a calibration setup as shown above.
2. Send a block transfer write (BTW) to the module with individual
channel bits set for the configuration desired for each input. This
effectively terminates any previous configuration of the
module/channel.
Figure 7.2
Input Calibration Timing Diagram
3. Apply offset voltage (0V) or current (0mA) to the input(s) to be
configured.
4. Send a block transfer write to set the IC bit and CK bit (1), and
reset the GO bit (0). This tells the module to determine offset
coefficients for the selected channels.
If you also set the RV bit to 1, the default values are assigned to
each channel. The default values are near but not precisely on
the calibration mark.
Configuration Offset Gain
Bit 15
Bit 14
Bit 07
Bit 06
Bit 05
Bit 04
Bit 01 ± 03
1