Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Chaz on August 12, 2017, 08:36:13 AM

Title: Mach3 Multiple Probe inputs
Post by: Chaz on August 12, 2017, 08:36:13 AM

I am using a CS Labs controller. How do I do multiple probe inputs?

I have a touch probe that runs as Normally Closed until the circuit is broken.

My height setter is using a simple 'make' circuit which connects 24V back into the input.

For the life of me, I cant see a logical way to allow both these to be connected at the same time, either using the same input circuit or more than 1, is it possible?

Thanks

Title: Re: Mach3 Multiple Probe inputs
Post by: Chaz on August 12, 2017, 10:24:11 AM

This is the issue. One is NO, one is NC, they cant work together, can they (without some form of a switch or disconnect).

(https://c1.staticflickr.com/5/4383/35686279484_a5ea4d3f8e_b.jpg)

Title: Re: Mach3 Multiple Probe inputs
Post by: joeaverage on August 12, 2017, 08:46:41 PM

Hi,
you either need some sort of switch, probably a change-over relay or upgrade to Mach4. Mach4 allows multiple, four I think, probe
inputs which can be assigned independently.

Craig

Title: Re: Mach3 Multiple Probe inputs
Post by: joeaverage on August 12, 2017, 08:51:02 PM

Hi,
just had another thought...how about an 'inverter' applied to one signal, that would make both signals NO or alternately NC which would
mean you could parallel both together on your probe input pin. Mach could not tell which signal had operated but at least one did.

Craig

Title: Re: Mach3 Multiple Probe inputs
Post by: ger21 on August 12, 2017, 10:22:45 PM

I've written a Brain before where you can wire each probe to separate inputs, and have the brain trigger the probe input when either of the probe inputs is active.

Title: Re: Mach3 Multiple Probe inputs
Post by: phando on September 06, 2020, 12:29:26 AM

I ran into the same problem. This got me to finally understand and write my own brain. It was simple and fixed my mixed signal probes.

Thank you.