M581 with multiple endstops: does anyone use it?

PuterPro

I planned on using M581 as a backup Emergency Stop in case of BLTouch failure.

I'm configured with Z and U dual steppers for Z on a CR-10S. I have endstops on both. Hadn't gotten to configuring yet ... Will I be able to use it for that after the change?

EDIT: BTW - any chance you could take a quick peek at:
https://forum.duet3d.com/topic/9889/upgrading-cr-10s-steppers-ps-to-24v-suggested-z-replacement/11

I asked you some Q's and am stuck until you answer ...

dc42

@puterpro said in M581 with multiple endstops: does anyone use it?:

I'm configured with Z and U dual steppers for Z on a CR-10S. I have endstops on both. Hadn't gotten to configuring yet ... Will I be able to use it for that after the change?

Yes, but you will need to set up 2 separate triggers.

deckingman

@dc42 said in M581 with multiple endstops: does anyone use it?:

@puterpro said in M581 with multiple endstops: does anyone use it?:

I'm configured with Z and U dual steppers for Z on a CR-10S. I have endstops on both. Hadn't gotten to configuring yet ... Will I be able to use it for that after the change?

Yes, but you will need to set up 2 separate triggers.

Or, @PuterPro could do what I do and that is wire all the "extra" switches in series (normally closed) and connect them to a single end stop. Then use a single trigger which will work if either switch changes state.

PuterPro

@dc42 - Easy enough.

@deckingman - That's clever, but I use them to independently home my dual Z, then pass control to a BLTouch to find Z Home. Need them independent at this point.

I've pondered slaving the Z's with a belt and pulley setup, if I do it I'll use your idea.

NicoLab28

For my part, I use one at a time.
It smells good the fix

Edgars Batna

I use it like this:

M581 E2:3 X1:0 Y1:0 S1 T0 C0

But don't ask me what this means - it's been over a year since I set it up. There's basically two endstops for X and Y and I need the machine to stop if it reaches them. Do what you need to, just let us know how to keep functionality.

gtj0

I use M581 with multiple endstops but would be perfectly fine with using multiple commands in the interest of decoupling the logical axis assignment from the physical input.

gtj0

@dc42 When you're done, will I be able to do the following...

With 7 endstop switches, say 0-6...
Home X with 0, Y with 1, Z with Probe
Calculate max X with 2, Y with 3 and Z with 4,5,6
THEN
set 2,3,4,5,6 as emergency stop switches?

(all without having to wire in series, etc)

dc42

Looks like the main reason to use multiple inputs to a trigger is to have all the endstops trigger an emergency stop. Maybe we should use a separate GCode command for that.

PuterPro

Looks like the main reason to use multiple inputs to a trigger is to have all the endstops trigger an emergency stop. Maybe we should use a separate GCode command for that.

And then there's this idea ... Sounds like the real solution, then you can rework M581 to your heart's content.