View online or download 1 Manuals for Allen-Bradley 1794-VHSC. Besides, it's possible to examine each page of the guide singly by using the scroll bar. (available for free online viewing or downloading in PDF): Operation & user's manual . Allen-Bradley 1794-VHSC Operation & user's manual (69 pages) Pages: 69 | Size: Allen-Bradley 1794 The 1771-OBD series C module is compatible with all 1771 universal I/O chassis except 1771-A1, 1771-A2, and 1771-A4. Make sure no other output module or single-slot block transfer module is placed in the same module group when using two-slot addressing.