@t3p3tony Thank you for helping debug this.

It is working now, the issue was with the end-stop extender wire.

Apologies for the inconvenience.

The challenge is not resolved even when connecting to other IO ports.

M98 P"0:/sys/config.g" commands shows below response.

@t3p3tony This is what I did as the first hardware debug, Swap the X-axis and U-axis end-stop, and X homed but U has a similar response.

@t3p3tony

I think the challenge is here, it senses the end-stop is always at Home.

I have tried connecting the end-stop to other IO pins but the results were similar.

Hi

I am trying to run a U-axis Cartisian configuration. It was working fine when I was using Sensorless homing but when I changed the homing with a 5V inductive end-stop it stopped working. The U-Axis does not move for homing.
I am using a similar 5V inductive end-stop switch for the X Y and Z-axis and they work fine with them.

Config.h

; Configuration file for Duet 3 (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.2 on Mon Sep 27 2021 10:57:47 GMT+0100 (British Summer Time)

; General preferences
G90                                      ; send absolute coordinates...
M83                                      ; ...but relative extruder moves
M550 P"H1.2"                             ; set printer name

; Network
M552 P10.0.20.162 S1                     ; enable network and set IP address
M553 P255.255.255.0                      ; set netmask
M554 P10.0.20.1                          ; set gateway
M586 P0 S1                               ; enable HTTP
M586 P1 S0                               ; disable FTP
M586 P2 S1                               ; enable Telnet

; Drives
M569 P0.0 S0                             ; physical drive 0.0 goes forwards
M569 P0.1 S0                             ; physical drive 0.1 goes forwards
M569 P0.2 S0                             ; physical drive 0.2 goes forwards
M569 P0.3 S0                            ; physical drive 0.3 goes forwards
M584 X0.0 Y0.1 Z0.2 U0.3                 ; set drive mapping
M350 X16 Y16 Z16 U16 I1                  ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z80.00 U80.00         ; set steps per mm
M566 X1000.00 Y1000.00 Z1000.00 U1000.00     ; set maximum instantaneous speed changes (mm/min)
M203 X26000.00 Y26000.00 Z26000.00 U26000.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z500.00 U500.00     ; set accelerations (mm/s^2)
M906 X2000 Y2000 Z800 U800 I30             ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                  ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 U0 S1                         ; set axis minima
M208 X400 Y400 Z150 U150 S0                   ; set axis maxima

; Endstops
M574 X1 S1 P"!io0.in"                    ; configure active-high endstop for low end on X via pin !io0.in
M574 Y1 S1 P"!io1.in"                    ; configure active-high endstop for low end on Y via pin !io1.in
M574 Z1 S1 P"!io2.in"                    ; configure active-high endstop for low end on Z via pin !io3.in
M574 U2 S1 P"!io3.in"
; Z-Probe
M558 P0 H5 F120 T6000                    ; disable Z probe but set dive height, probe speed and travel speed
M557 X15:215 Y15:195 S20                 ; define mesh grid

; Heaters

; Fans

; Tools

; Custom settings are not defined

Homeu.g

G91
G1 H1 U155.0 F2000 ; move quickly to X axis endstop and stop there (first pass)

G90 ; absolute positioning

Please advise on what I am doing wrong in the config.

@dc42 Thank you, I will try this.

@neo0204 Confirmed it from igus documents, it's PNP.

Please help me on how to connect this.

@dc42 Thank you for your response.

I have got this, Is it PNP or NPN?

If it is PNP, how do I connect it to the duet board.

@jay_s_uk I tried this yesterday and sadly it's not working.

What else I can do to make it work?

@jay_s_uk Yes the PSU is the same,

Like this?

M574 X1 S1 P"!^io0.in"