Hi - Just acquired an old Seig3. All working except limit switches appear inoperative. Tried manual tripping on diag. page and they do not change the button illumination.
It is stuck with impossible machine zero cords and I am having difficulty resetting. Should I disable the limit switches somehow. Or is there a way to re-zero? I have set the machine at the desired zero position but cannot reset or zero the DRO.
Bit new to M3 as just retired and moved down from big stuff. So probably something simple I have not read up on. Although spent a whole day researching the method!
Your learned assistance requested.

Sounds like you do not have the port or pin number set up correctly for the limits or that they are not set up at all.
You can have a  look in Ports and Pins, Inputs (from Config menu) to see if they are set correctly.
You can also disable them there if you wish. If you disable them then whenever you press RefAll the machine coords will be set to zero.
Hood

Hood - Thank you so much!
They where checked and as you suggested disabling them allowed the reset.
Blew almost a whole Sunday trying to solve that.
If you ever travel south, you have a place to stay on the coast!
My respects to you.