what am I missing? I have mach3 usb bob .The board lights up motors work.My limit switches are not working and my emergency switch is also
            not working.I have power at the board and there is power at the limit switch.when I look at my diagnostics page the word external show up under
             the pulse frequency is this normal

can't see in my Magic glasball witch USB Controller you are using, but i think

Config -> Ports&Pins -> Input signals

are not set correctly (Port or Pin).

         
         the card has an eagle on it and its red the only name I could find is bitsensor.com
         The driver that I download to mach3 is RnRmotion
         I also used the 5 pin choices on one axis to try to get my limit switch to work

I think you will find that the inputs and outputs are on different port numbers. Do a search for bitsensor on the forum.

Make sure you use a genuine licence file, NOT the one that came with it.

https://www.machsupport.com/forum/index.php?topic=38895.msg271538#msg271538

here:

https://buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach3-USB-Board

you can find a lot of Information how to wire/Setup Limit switches