Rockwell Automation T7420A_AF ICS Regent+Plus Analog Input Modules 60Hz Rejection and Fast Response - Manual (Page 23)

Analog Input Modules (T7420A, AF)
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Figure 14. I/O Extender Connections for Differential Analog Input Calibration.
Within each pair of jumper posts, make sure that you connect
the voltage source to the jumper posts nearest the front of the
I/O extender. Do not make any connections to the jumper
posts nearest the I/O chassis backplane — these connect to the
actual field wiring attached to the I/O slot terminals on the I/O
chassis.
Calibration Steps
1. Remove the module to be calibrated from the I/O chassis.
2. Install the I/O extender module into the slot from which
the module was removed.
3. Remove the jumpers (if installed) labeled CH1 through
CH16 from the I/O extender module.
Important!