Rockwell Automation T7903 ICS Regent+Plus I/O Termination Assembly (ITA) - Manual (Page 39)

I/O Termination Assembly
P D - 7 9 0 1 M a r c h , 0 6
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A set of five screw terminals on the Varelco variant of the ITA provides
the facility to connect to ground the spare Varelco pins. This ITA can
be used with T7420 when using differential voltage input wiring. The
detailed connections are listed in Table E-3.
Table E-3. Varelco J10 Connection Details.
Connector
Ident Pin Ident Comments
J10 A Connect AREF1 and
AREF2.
J10 B Connect AGND (T7420).
J10 C Connect Fused Common
Return (T7420).
J10 D No Connection.
J10 GND Connect to ground.