Wiring a Limit Switch to an RI

I want to set up a limit switch that will send a signal to RI. I attempted to wire it into the CRF7 connector, connecting the switch to an RO on one side and RI on the other. My idea was to keep the RO permanently on sending a signal to the switch and then when the switch is tripped it would complete the circuit and send that signal back to RI. Has not worked. What am I doing wrong? I am very new to the RI/RO side of things so im not surprised it didnt work first try but I cant seem to find clear instructions how to do what I want to do.

Its an Rj3iB controller and an Arcmate 120iB robot if that affects things at all. Thanks for any help you can give.

That makes sense, thank you

It's simply to send a signal into the robot so it can determining what part is in front of it. We often have alternating components but sometimes operators will load the same one twice in a row and then the robot runs the wrong program. With the switch in place one part will trip it and one part won't so it can read that signal and run properly even if the operator loads wrong.

Everything is working, thanks for the help everyone. I should have just started here instead of going on my own understanding, could have saved me a day haha.