nachi io to the plc issue

Hello everyone, my work has an fd11 nachi robot that a part present switch was added a few years ago, and it works, because you can see it on the internal plc in the robot, but not in the plc for the main machine. I did find a line in the nachi plc that shows the input on from the actual pp switch, right below the other two pp switches on the machine. (those two do show up in the main plc) and as far as i can tell it should show up in the main, i don't think we are out of the ranges of the IO inputs/outputs. Below are some pictures of what i am talking about sorry if they are blurry, the teach pendant is getting pretty dirty.

I'll add a few more pictures but it doesn't seem to let me add more than 1

last one, thank you again for any help

thank you for the reply, is there an easy way to search for bits in the plc? There are three programs and they are like 800 lines long. Thanks again