Need Help!- Using 1>>0 transition on G31

[Adam Rehorn]

Hi all!

Okay, so I figured out why I was having problems with my high-speeds skip addressing being off.

However, I now have a new problem.

The sensor I'm using to drive my skip (G31) is a laser. It is a reflective sensor that is a logic 1 when it 'sees' solid material, and a logical '0' when it sees a hole.

I want to scan for holes. However, G31 seems only to work for a 0->1 transition. However, I need it to work in the opposite way. Is there a way for this to be done? Is there an 'invert' parameter for the G31, so it can arrest motion on a 1-> 0 transition?

I would really appreciate all help.

Thanks!

[guhl]

To mi mynd, PMC don't understand rising or falling front of input signal. Only potential.
You can invert sensor's output by means of NPN transistor and pull-up resistor

[Adam Rehorn]

Just heard this from FANUC:

Bit 6 of Parameter 6200 will allow the inversion for what I want to do. No electronics required!

So, that's one for everybody else to take note of.

[Al_The_Man]

What controller?
Al.

[Adam Rehorn]

Oh yeah, sorry.

It's a 30i controller.