Reset on homing z axis with a z probe

ateRstones

We are using a e3d toolchanger based printer with a Duet3d 6HC and a 3HC expansion board with web control. All on version 3.5.0beta4. The problem is not present in 3.4.6 (or 3.4.5).

When configuring the z axis endstop to be a z probe and then subsequently run a G1 H1 (or even H4) we observe a reset. Further, after the reset, the expansion board is not detected anymore.

Both the z axis stepper and the probe are connected to the mainboard.

Relevant section of config.g

M558 P5 C"io2.in" K0 H3 F360 T20000
M574 Z1 S2 K0

When we then run z homing we observe reset on the G1 H1 command (tested using the console)

G91
G1 H1 Z-200 F2000

M119 gives expected outputs and detects the z probe state change.

If we define the switch as a regular endstop, z homing functions function. But we require a z probe.

M574 Z1 S1 P"io2.in"

Full config.g and homez.g:
homez.g config.g

gloomyandy

@ateRstones Please post the output from running M122

ateRstones

@gloomyandy here you go: m122-homing-problem.txt

sorry for the late response, I'm only infreqently near the machine atm

Phaedrux

@ateRstones said in Reset on homing z axis with a z probe:

M574 Z1 S2 K0

That's not quite right.

https://docs.duet3d.com/User_manual/Reference/Gcodes#m574-set-endstop-configuration

S2 = Z probe (when used to home an axis other than Z)

But it sounds like you're actually trying to use it with the Z axis.

To configure a z probe using a swithc, use M558 and G31 to configure the switch as a probe and use a G30 command in your homing files to use the probe. Leave out the M574 Z line entirely. It's not needed when configuring a probe for Z.

https://docs.duet3d.com/User_manual/Reference/Gcodes#m558-set-z-probe-type

https://docs.duet3d.com/en/User_manual/Connecting_hardware/Z_probe_connecting#z-probe-modes-selectable-in-firmware

You'd want M558 P8 for a switch.

dc42

@ateRstones is this resolved?

ateRstones

@dc42 the answers were able to resolve the problem, thanks everyone for the help!