Yes, the limit switch is shared the same pin with the home switch. But for the tool sensor, do we have to use a new pin, for which there is no additional pin in Mach3 if we have 4 axes plus a pin for Estop. Is it correct ?
Peter

You can have ALL limits and home switches sharing a single input thuis you would have plenty spare.

Hood

Thanks
How can we share the single pin for all 4 axes switches ? Can we share the same pin (pin 15) for the tool sensor and the Estop ? If yes, it will solve the problem.
Thanks again for your help.
Peter

You can connect ALL of your home and limit switches in series and then you will only need to connect to one pin. You set all these limits and home switches up as the same pin in Machs Ports and Pins.

You could set the tool sensor up to the same pin as the E-Stop but that would just be trouble as when the sensor was hit Mach would instantly stop the pulses and the axis would likely travel further than Mach thinks it has. You should never use the Stop  button when an axis is in motion or you will loose position and need to re-reference.External  E-Stop and the Stop  button in Mach are meant for Emergency only.

Hood

So I can use any pin other than Estop pin to share the tool sensor inputs, just connect in series and set the same pin # in Machs ports and Pin.
Thanks very much

If you use another pin that is already being used then it will be seen as that function as well as the sensor and vice versa. This may or may not be a problem, that will depend on what function you share the pin with and what you do with the input.
 As mentioned previously, if you are needing extra Inputs either get a second port or share All of your home and limit switches and then you will have spare inputs.
Sharing limit and home switches will not affect anything else as Mach does not care which switch is hit when it is seeing them as limits and when it is homing it is only moving one axis at a time so again it doesnt matter that they are all shared.

Hood