Rockwell Automation T3420AF ICS Regent Analog Input Modules - Manual (Page 10)

Analog Input Modules (T3420A, AF)
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In differential mode, a 10K Ohm resistor is in series with each
input line of each input analog channel pair. The capacitors
are placed on the multiplexing side of the resistors. The
filtering is then differential. There are four rows of eight pins
labeled J506 and J507, for differential mode filtering install
jumpers between rows J506 and J507 (for a total of eight
jumpers).
Frequency response data for the T3420A and T3420AF is
provided on page 37.