Rockwell Automation T7903 ICS Regent+Plus I/O Termination Assembly (ITA) - Manual (Page 49)

I/O Termination Assembly
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The modules which use the Differential Field Loop with Dioded Power
Protection ITA are listed in Table 1 of the main document. These
modules function in a manner such that the field devices do not
require a common feed or return, as illustrated below:
The connector idents are shown on the legend on the ITA.