Help Configuring Dual Z endstops for SKR 1.4 Turbo

I'm building a 3d Printer with 2 z motors and 2 z endstops. The z axis is moving up and down as expected, so the motors and drivers in Marlin 2.1.1 should be set correctly.

This system uses the SKR 1.4 Turbo board and I need help with 2 items.

1: How to I configure the dual z endstops in firmware? I think the following is where the changes are supposed to be made but I don't understand what this means "// Z2 endstop board plug. Don't forget to enable USE_*_PLUG."

Quote
#define Z_MULTI_ENDSTOPS // Other Z axes have their own endstops
#if ENABLED(Z_MULTI_ENDSTOPS)
#define Z2_USE_ENDSTOP _XMAX_ // Z2 endstop board plug. Don't forget to enable USE_*_PLUG.
#define Z2_ENDSTOP_ADJUSTMENT 0 // Z2 offset relative to Y endstop
#endif

2: Where does the second endstop plug into the board and how do I tell Marlin where it is?

Edited 3 time(s). Last edit at 11/08/2022 12:42PM by PickyBiker.

I believe this sould be

Zmin=Z1 limit switch
Zmax=Z2 limit switch

Edited 1 time(s). Last edit at 11/08/2022 06:20PM by Roberts_Clif.

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Computer Programmer / Electronics Technician

1)
when you enable an endstop you also have to say what plug is used

Ie.
#define USE_XMIN_PLUG
#define USE_YMIN_PLUG
#define USE_ZMIN_PLUG
//#define USE_XMAX_PLUG
//#define USE_YMAX_PLUG
#define USE_ZMAX_PLUG


2)
#define Z2_USE_ENDSTOP _XMAX_

change to _ZMAX_ to use z-max endstop

Edited 1 time(s). Last edit at 11/08/2022 06:59PM by Dust.

Here are my current configurations for configuration.h and configuration_adv.h.
Unfortunately, when I home the Z axis, tripping one or both z endstops doesn't stop the movement. Both of the endstop switches are configured with NC connections.

What am I doing wrong?


Configuration.h

DRIVERS
#define X_DRIVER_TYPE TMC2209
#define Y_DRIVER_TYPE TMC2209
#define Z_DRIVER_TYPE TMC2209
#define Z2_DRIVER_TYPE TMC2209
#define E0_DRIVER_TYPE TMC2209

ENDSTOP PLUGS
#define USE_XMIN_PLUG
#define USE_YMIN_PLUG
#define USE_ZMIN_PLUG
#define USE_ZMAX_PLUG

ENSTOP INVERT
#define X_MIN_ENDSTOP_INVERTING true // Set to true to invert the logic of the endstop.
#define Y_MIN_ENDSTOP_INVERTING true // Set to true to invert the logic of the endstop.
#define Z_MIN_ENDSTOP_INVERTING false // Set to true to invert the logic of the endstop.
#define Z_MAX_ENDSTOP_INVERTING false // Set to true to invert the logic of the endstop.


Configuration_adv.h

#define Z_MULTI_ENDSTOPS // Other Z axes have their own endstops
#if ENABLED(Z_MULTI_ENDSTOPS)
#define Z2_USE_ENDSTOP _ZMAX_ // Z2 endstop board plug. Don't forget to enable USE_*_PLUG.
#define Z2_ENDSTOP_ADJUSTMENT 0 // Z2 offset relative to Y endstop
#endif

Edited 1 time(s). Last edit at 11/09/2022 03:55PM by PickyBiker.

What does M119 report when you manually trigger the Z endstops?

With both switches manually activated, this is the m119 result. Looks like something wrong with the z switch.

x_min: open
y_min: open
z_min: open
z2_min: triggered

The wiring checks out okay at the board connector end and the pin mapping in the btt_skr_V1.4.h looks like this:

#elif ENABLED(Z_MULTI_ENDSTOPS)
#ifndef Z_MIN_PIN
#define Z_MIN_PIN P1_27 // Z-STOP
#endif
#ifndef Z_MAX_PIN
#define Z_MAX_PIN P1_00 // PWRDET
#endif

And according to the schematic, those are correct for the SKR 1.4 turbo

It really got me scratching my head now.

Okay, just read something about cutting a pin off the 2209's or the endstops won't work correctly.

Really! Cutting off one of the pins? Is that really necessary? On all of them?

Yes you must remove the diag pins form the stepper driver modules. These pins are directly connected to the endstop pins and interfere with endstops. The skr 1.3 was a better design in this area, it had jumpers that could be removed instead off cutting off pins.

Yep, I clipped the pins on all 5 drivers and now the whole think g is working.

Such a shame to have to permanently mutilate a driver to get it to work. In the future, if I want to try sensorless, I will need 5 new drivers. Yuck.

Its a standard 2.54mm two pin connector, you just solder on a new one,

Thanks!