Setting the input gain – Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules User Manual

Page 126

Publication 1794-6.5.8 - January 2010

124 Calibrating Your Module

Setting the Input Gain

Set the gain of the module second. You must set the offset before
setting the gain.

1. Apply gain voltage (5.25V or 10.25V) or current (21.0mA)

toselected inputs.

2. Send a BTW to the module to set the IC bit and the CK bit to 1

and the GO bit to 1. This tells the module to determine gain
voltage/current for the selected channels. If you also set the RV
bit to 1, default values will be used on all selected channels.

3. Send a BTW to the module to reset the CK bit to 0 with the GO

bit still 1. This stores previously determined coefficients into
EEPROM on selected channels. If QK is set (1), the same
coefficients will be stored to all “like” configurations. For
example, if configuration is set to voltage, bipolar/polar, X1/X2
will also be configured. See the table on the previous page.

4. Monitor the module block transfer read word. Clear the IC bit.

Gain calibration is terminated.