There should be plenty of inputs as-is.
ALL limit switches are wired in series (out of one, into the next) in a daisy-chain manner and all go to one input on TB5. It doesn’t matter WHICH limit is reached, you want to stop everything NOW.
That still leaves 4 inputs – one for Z-home, Y-home, X-home (and A-home if you have it).
The board already provides 10k pullups to +5V. Other than that, nothing is done to those 5 signal lines.
I’ve attached a schematic if that helps in understanding. Let me know if you need more info!
BrianV
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