Originally Posted by resistor  Inputs 1 through 4 are generally wired to NC (normally closed) switches,
C (common) side of the switch wired to the respected input on the G540 terminal.
NC (normally closed side of the switch wired to the common system ground.
There is no other voltage applied to the switches.
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Okay, now I feel like a bone head. I'm actually laughing because it is obvious isn't it. While the power supply voltage goes into the G540, the G540 doesn't put out that power and current to the limits and e-stop. I'm usually more on the ball than this, I guess I don't need to fuse the limit switches or E-stop either now. Don't ask me why I was thinking the limits were self powered. I think I'll give it a day then erase this thread out of embarrassement. I have a copy of the latest manual, just did a brain fade is all.