The "C" in that part number indicated (way back when) that the module shipped with a wiring swingarm in the box. That's a very old, but still compatible-with-everything 1771-AS Universal Remote I/O Adapter.
I've found that the 1771-ASB Series E user manual includes the settings and specifications for all of the 1771-ASB predecessors, including 1771-AS and 1771-ASB Series A,B,C,D.