2-wire Mechanical N/O endstop switches

fcwilt

Hi,

When you had the ! did you also change the S0 to S1?

Frederick

kroybal

Some progress made.

I swapped to S1 and now the DWC is registering 4 out of 5 endstops. Where 3 of the 4 registered read as being not triggered and the 4th registered being read as n/a.

I tried tapping all of the endstops monitoring if DWC would see if they got triggered to which it did not.

Phaedrux

@kroybal said in 2-wire Mechanical N/O endstop switches:

M574 Z1 S0 P"io4.in" ;Z-Min switch active-low M574 Z1 S0 P"io5.in" ;Z-Min switch active-low

This should be formatted as M574 Z2 S1 P"io4.in+io5.in"

Plus inverting with ! if necessary.

kroybal

@Phaedrux said in 2-wire Mechanical N/O endstop switches:

This should be formatted as M574 Z S1 P"io4.in+io5.in"

Formatting this way is to combine redundant switches?

After implementing this, my endstop status column on the DWC lists 4 out of 5 endstops (indexing 0-3) Keeping the inverted "!" indicator across all endstops results in index 0,1 & 2 as not triggered and index 3 as n/a.

Phaedrux

https://duet3d.dozuki.com/Wiki/Gcode#Section_M574_RepRapFirmware_Num_3

Do you have dual z motors? What is the reason for redundant switches?

jay_s_uk

@kroybal you should be wiring the endstops between ioX.in and ground, not 3.3v and ground.
Can you post a photo of your wiring of one of the plugs?

kroybal

@Phaedrux The machine came with the switches pre-installed I do not see any obvious reasons for redundant Z switches. My lab manager did buy a modulated IR Z probe which will certainly effect the setup down the line once its installed.

kroybal

UPDATE:

@jay_s_uk & @Phaedrux

I got the switches running. I will probably just recognize only one of the redundant switches, since they seem to be coplanar and serve no obvious purpose. I am working with some juiced up motors for the z-axis and the only reason I can think of for redundant switches in to be safe not to damage the machine in the event of a signal failure.

I could post a photo if you are interested however, doesn't seem to be necessary at this point!

Thanks for your help.

fcwilt

@kroybal said in 2-wire Mechanical N/O endstop switches:
...the only reason I can think of for redundant switches in to be safe not to damage the machine in the event of a signal failure.

I could post a photo if you are interested however, doesn't seem to be necessary at this point!

I would like to see a picture of the two Z end stop switches.

I had two on a printer at one time when I was experimenting with homing Z at a very high speed until it triggered the first end stop switch. Then the homing continued at a safer speed until the second end stop switch triggered.

Thanks.

Frederick

kroybal

@fcwilt

fcwilt

It looks like they planned to have a endstop for each Z stepper so homing would also get the two steppers back in sync if they happened to get out of sync for some reason.

So you may want to implement that.

Frederick

Phaedrux

@Phaedrux said in 2-wire Mechanical N/O endstop switches:

@kroybal said in 2-wire Mechanical N/O endstop switches:

M574 Z1 S0 P"io4.in" ;Z-Min switch active-low M574 Z1 S0 P"io5.in" ;Z-Min switch active-low

This should be formatted as M574 Z2 S1 P"io4.in+io5.in"

Plus inverting with ! if necessary.

This would get you the releveling with dual endstops.