Allen-Bradley 1786-TPR Brand Introduction Allen-Bradley 1786-TPR is Bulletin 1786 series ControlNet right-angle T-tap coaxial connector, developed by Rockwell Automation. It specializes in tapping branch drop cable from ControlNet main trunk coaxial cable, realizing physical network connection for ControlNet fieldbus nodes such as 1794-ACN15 Flex I/O adapter.