Z probe already triggered (with I0 and I1)
megaloduet last edited by megaloduet
i hope it is a small issue and anyone has a advice for me.
I use a NPN Normally Open sensor but it always gives me the error:
G28 Z Error: Z probe already triggered at start of probing move Error: Homing failed
Hardware: Duet 2 Wifi
Board: Duet 2 WiFi (2WiFi)
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.1.1 (2020-05-19b2)
Duet WiFi Server Version: 1.23
No matter if I invert the probe via M558 or not. (If I start homing with a piece of metal below the sensor it starts)
See my Tests and config:
; Z-Probe ;M558 P1 C"zprobe.in" H5 F120 T6000 M558 P5 C"zprobe.in" H5 F120 T6000 I1 ; set Z probe type to unmodulated and the dive height + speed ;G31 P500 X0 Y0 Z2.5 G31 X0 Y0 Z2.5 ; set Z probe trigger value, offset and trigger height M557 X15:215 Y15:195 S20 ; define mesh grid
; homez.g ; called to home the Z axis ; ; generated by RepRapFirmware Configuration Tool v3.1.3 on Mon Jun 22 2020 09:53:01 GMT+0200 (Mitteleuropäische Sommerzeit) G91 ; relative positioning G1 H2 Z5 F6000 ; lift Z relative to current position G90 ; absolute positioning G1 X15 Y15 F6000 ; go to first probe point G30 ; home Z by probing the bed
The web Ui confirmes that the probe is connected and reads the values.
Default : ZPROBE 1000
With piece of metal below: ZPROBE 0
Results with I0/I1 when homing:
G31 Readings with I0 and I1
aidar last edited by aidar
From wiki - Invert the input by prefixing the input pin (C parameter) with ! character, when using an NPN output inductive or capacitive sensor or using an NO switch (not recommended, use a NC switch instead).
I1 parameter does not work for firmware 3.x, so try M558 P5 C"!zprobe.in" H5 F120 T6000
megaloduet last edited by
Thank you, you are a wizard! It works perfectly!
aidar last edited by
You welcome, but for future reference the icon that looks like book on top of your screen (Duet3d documentation) makes you a wizard as well, if you read it.