I think those limits are only for gcode commands and not for the firmware itself.
But I'll test it anyway.

Do give you guys an update and also for someone who might have the same issue:

Installing the probe (in my case PINDA 2) with almost no Y offset solved my probing problem.
My guess ist that any small difference (parts, rods, frame) gets amplified by the probe when the location has a big Y offset to the nozzle.

I also do not recommend using "True Bed Leveling" with a cartesian printer. This could tilt the X axis which does also add an angle to the nozzle and probe. I level my X axis (tilt) by running into the Z endstops.

New working height map (almost perfect first layer)

Z = 0 reference point is X10 / Y10.

And if anyone is interested in how in configured my PINDA:

; Z-Probe PINDA
M574 Z1 S2 ; Set endstops controlled by probe
M558 P5 C"^zprobe.in" I1 H0.9 F1000 T6000 A20 S0.005 ; PINDA
G31 P1000 X23 Y5 Z1.025 ; PEI Sheet Offset
;G31 P1000 X23 Y5 Z1.325 ; Textured Sheet Offset
M557 X24:221 Y10:195 P12 ; Define mesh grid

The probing is quite fast but the accuracy is quite good as the probe rarely needs more than 2 probes per point.
Next I need to figure out how to use the temperature compensation with the G31 command.

@droftarts

Thank your for the explanation!
That makes a lost sense then. I must have missed that in the documentation.

I think I read somewhere that you can only chose between specific ports on Duet 3 for the Z probe but only the Z probe input for the probe on the Duet 2, but I might be wrong with that.

I think this thread might be the right location for this I guess because it's something I would need

Since I upgraded my Prusa MK3s to a Duet 2 WiFi board I try to enable all the features the Prusa original FW had.
This means:

• automatic loading of filament when there is no filament in the extruder
• PINDA temperature compensation table because the probe Z offset differs depending on the temperature. In my experience this is not linear and the higher the temperature the lower Z = 0 becomes meaning if you calibrate your printer with PLA, ABS will need recalibration as the nozzle will be too low.

My target is to create a config package for others so they can 1:1 swap their board and don't need to tweak much as my config uses all the convenient features, like the filament sensor, with explanation of what needs to change in the config depending of the used extruder or stepper motors (e.g. 0.9/1.8 degree).

1.
Feature to load the filament automatically.
Status: no filament in the extruder, extruder has PLA temperature (210°C)
Behaviour: Putting filament in the extruder triggers the filament sensor which then automatically loads filament.
Problem I had: The firmware only allows me to operate the filament sensor in one direction because the pin is blocked/reserved. Meaning I could only enable auto load or run out detection at once. So I had to split it in two over macros and start gcode.

So here is my (over complicated?) solution right now:

config.g

; Filament Sensor Port and Loading Feature ON
M950 J1 C"e0stop" ; Input 1 e0 Filament Sensor 
M581 P1 T2 S0 R0 ; Filament Sensor P1 triggers Trigger2.g always (R0)

Runout is not working right now. So when the printer is starting up and there is no filament and filament is put into the extruder trigger2.g is called:

trigger2.g:

; Loading Filament Script

M300 S800 P200
M581 P1 T2 S-1 R0 ; Filament Sensor does not listen anymore (S-1). Autoload is disabled. 
M291 P"Please wait while the nozzle is being heated up" R"Loading PLA" T5 ; Display message
T0 ; Activate Hotend
M291 P"Feeding filament Trigger2" R"Loading PLA" T5 ; Display new message
G1 E70 F800 ; Feed 70mm of filament at 800mm/min
G1 E55 F300 ; Feed 50mm of filament at 300mm/min
G4 P1000 ; Wait one second
G1 E-5 F800 ; Retract 3mm of filament at 800mm/min
M400 ; Wait for moves to complete
M292 ; Hide the message
G10 S150 ; Set current tool temperature to 150C
;G10 S0 ; Turn off the heater again

; Filament Sensor Port and Runout Feature ON
M581 P1 T2 S-1 R0 ; Filaent Sensor does not listen anymore (S-1). Autoload is disabled. 
M950 J1 C"nil" ; Input 1 e0 Filament Sensor 
M591 D0 P2 C"e0stop" S1 ; Filament Runout Sensor

After the loading script the sensor is put into mode "runout detection ON"

But what if you turn your printer on and filament is already loaded and you directly start your print? This would mean that there is no runout detection enabled.
My solution right now is putting this into the Start GCODE in the slicer software:

; Prime Filament Sensor for Runout
M581 P1 T2 S-1 R0 ; Filament Sensor P1 triggers Trigger2.g always (R0)  TRIGGER OFF
M950 J1 C"nil" ; Input 1 e0 Filament Sensor 
M591 D0 P2 C"e0stop" S1 ; Filament Runout Sensor

And there is a third scenario. What if you want to manually change your your color (filament) mid print?
After unloading the filament the sensor needs to be in mode "autoload" and after the autoloading is complete it has to go back to the mode "runout detection".

So i added this to my filament-change.g macro:

M25
G91 ; Relative Positioning
G1 Z20 F360; Raise Z
G90 ; Absolute Values
G1 X200 Y0 F6000 ; Parking Position
M300 S800 P8000 ; play beep sound
M98 Pejectfilament.g
M400

Called Pejectfilament.g:

M591 D0 P0 C"e0stop" S1 ; Filament Runout Sensor
M950 J1 C"nil"

M291 P"Please wait while the nozzle is being heated up" R"Unloading PLA" T5 ; Display message
T0 ; Activate Hotend
M109 S210
M291 P"Retracting filament..." R"Unloading PLA" T5 ; Display another message
G1 E+8 F300 ; Extrude 8mm of filament at 300mm/min
G1 E-45 F800 ; Retract 480mm of filament at 800mm/min
G1 E-15 F900 ; Retract 480mm of filament at 900mm/min
G1 E-25 F900 ; Retract 480mm of filament at 900mm/min
M400 ; Wait for the moves to finish
M292 ; Hide the message again
M300 S800 P200

; Filament Sensor gets ready for next load
M950 J1 C"e0stop" ; Input 1 e0 Filament Sensor 
M581 P1 T3 S0 R0 ; Filament Sensor P1 triggers Trigger3.g 

At the end trigger3.g:

M300 S800 P200
M581 P1 T2 S-1 R0 ; Filaent Sensor does not listen anymore (S-1). Autoload is disabled. 
M291 P"Please wait while the nozzle is being heated up" R"Loading PLA" T5 ; Display message
T0 ; Activate Hotend
M291 P"Feeding filament Trigger3" R"Loading PLA" T5 ; Display new message
G1 E70 F800 ; Feed 70mm of filament at 800mm/min
G1 E55 F300 ; Feed 50mm of filament at 300mm/min
G4 P1000 ; Wait one second
G1 E-1 F800 ; Retract 1mm of filament at 800mm/min
M400 ; Wait for moves to complete
M292 ; Hide the message

; Filament Sensor Port and Runout Feature ON
M581 P1 T2 S-1 R0 ; Filaent Sensor does not listen anymore (S-1). Autoload is disabled. 
M950 J1 C"nil" ; Input 1 e0 Filament Sensor 
M591 D0 P2 C"e0stop" S1 ; Filament Runout Sensor

I know it first seems quite complex but when runout is enabled the port is blocked and can't be used for autoload.
Now I've read about the implementation of if / else statement which could make things quite simpler and also lowers the change of error as there would be no need to put code into the start gcode.

Like so (be aware, I'm no coder! )
Filament Sensor Status = 1 means no filament

func autoload {
M581 P1 T2 S-1 R0 ; Filament Sensor does not listen anymore (S-1). Autoload is disabled.
M950 J1 C"nil" ; Input 1 e0 Filament Sensor
M591 D0 P2 C"e0stop" S1 ; Filament Runout Sensor
}

func runout_detection {
M581 P1 T2 S-1 R0 ; Filament Sensor P1 triggers Trigger2.g always (R0) TRIGGER OFF
M950 J1 C"nil" ; Input 1 e0 Filament Sensor
M591 D0 P2 C"e0stop" S1 ; Filament Runout Sensor
}

if Filament_Sensor state changed to "1" {
autoload
} else {
runout_detection
}

Something like that

2. PINDA Temperature calibration

The PINDA (v2) has an built in thermistor to use the Prusa FWs temperature compensation table.
RRP FW has has similar feature built in into the G31 command:

G31 P1000 X23 Y5 Z0.995 C0.0010 S20 H2

I've measured the Z trigger height with several temperatures from 20°C, 25°C up to 50°C and saw that the variance was not linear. At first the offset got bigger meaning the nozzle would be too close to the bed and after 40°C the difference were much smaller up to 50°C.
I'm not quite sure how the Prusa FW stores and uses the recorded values when the FW does it's auto temperature PINDA calibration but what would work is if you could use different G31 code lines depending of the temperature of the PINDA thermistor.

My "I'm no coder" mind thinks of the following:

if PINDA_Thermistor <25°C {
G31 P1000 X23 Y5 Z0.995
}
else if PINDA_Thermistor >=25° AND PINDA_Thermistor <30° {
G31 P1000 X23 Y5 Z1.005
}
else if PINDA_Thermistor >=30°C AND PINDA_Thermistor <35° {
G31 P1000 X23 Y5 Z1.020
}
.
. and so on...
else {
G31 P1000 X23 Y5 Z2.0 ; safety height
}

Hope it is clear what I mean

If figured it out by trial and error.
Now I'm using the E1 thermistor port. I don't know why I couldn't use the exp.thermistor 7 port.

New setup:

M308 S2 P"e1_temp" A"PINDA" Y"thermistor" T100000 B3950
G31 P1000 X23 Y5 Z1.025 C0.0010 S20 H2		; PEI Sheet Offset

The same issue I had with the Z probe. I wanted to use another port (not Z probe in) but the FW just responded "no probe".
Maybe I did get the documentation wrong and things aren't freely mappable as I think they are.

If I probe X150 Y150 to get a Z = 0 value I want this place to be probed and not somewhere else where my nozzle might be because this is later the place the nozzle prints.
And it's easy to remember: G30, G31 use the offsets to get a accurate reading of the coordinates you want to measure for the nozzle.

"what does that mean, "it's the same for the lead screws"?"

It means that you need to keep in mind that your probe has an offset.
For example: Offset is X20 and Y20. If you then use "G30 P1 X220 Y100 Z-99999 S2" for your 220 wide bed the nozzle won't be able to probe because it is most likely outside of your print bed because of the offset.

It's a bit confusing at first though.

@jens55

Yes I meant PA. LA is a bad Marlin habit from the past

I don't think it has been asked before but what is your retraction speed? Too fast and the gear may also grind through the filament.

G31 uses the tools position but you have to consider the offset in your calculation.

Example: If your printer has bed size of x 250mm and y210mm and your probe offset is x20 and y0 your mesh grid (M557) must start at x20 and stop at x230. (better to give it some more space so x25 and x225 is advisable)

It's the same for the lead screws if you use G32 to trigger bed.g.

Maybe you could post your config.g?

Hello forum (hopefully the right sub forum)

I‘m trying to configure my Duet 2 WiFi to use the built in thermistor of my PINDA probe as this is supported with RRF 3.
Then I want to use it for Z offset temperature compensation for G31 as the probe reads different Z values depending on it’s temperature.

The gcode I use for the thermistor which is connected to thermistor 7 on the expansion port:

M308 S2 P"exp.thermistor_7" A"PINDA" Y"thermistor" T120000 B4725

The temperature reads 2000°C and jumps to 354.8°C and also 1160°C.

Adding or removing zeros to the T value does not help.

My whole config:

; General preferences
G90                                         ; Send absolute coordinates...
M83                                         ; ...but relative extruder moves

; Network
M550 P"Pruset II MK3s"                        ; Set machine name
M552 S1                                     ; Enable network
;M552 S2                                     ; Enable AP
;*** Access point is configured manually via M587
M586 P0 S1                                  ; Enable HTTP
M586 P1 S0                                  ; Disable FTP
M586 P2 S0                                  ; Disable Telnet
M575 P1 S1 B57600							; Panel Due

; Drive Mappings
M569 P0 S1                                 ; Drive 0 goes forwards: X Axis
M569 P1 S0                                 ; Drive 1 goes backwards: Y Axis
M569 P2 S1                                  ; Drive 2 goes backwards: Z Axis
M569 P3 S1                                  ; Drive 3 goes forwards: E Axis
M569 P4 S1                                  ; Drive 4 goes backwards: Z Axis (at E1)

; Micrpstepping and Speed
M350 X16 Y16 E16 Z16 I1                     ; Configure microstepping with interpolation
M92 X200.00 Y200.00 Z400.00 E415.00         ; Set steps per mm
M566 X480.00 Y480.00 Z24.00 E300.00 P1      ; Set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z720.00 E1500.00   ; Set maximum speeds (mm/min)
M201 X2500.00 Y2500.00 Z1000.00 E2000.00    ; Set accelerations (mm/s^2)
M906 X620.00 Y620.00 Z550.00 E500.00 I10    ; Set motor currents (mA) and motor idle factor in percent
M84 S30                                     ; Set idle timeout


; Motor remapping for dual Z and axis Limits
M584 X0 Y1 Z2:4 E3				; two Z motors connected to driver outputs Z and E1
M671 X-37:287 Y0:0 S10			; leadscrews at left (connected to Z) and right (connected to E1) of X axis
M208 X0:250 Y-4:212.5 Z-0.1:205  ; 			X carriage moves from 0 to 250, Y bed goes from 0 to 210
M564 H0							; allow unhomed movement

; Endstops for each Axis
M574 X1 S3								 ; Set endstops controlled by motor load detection
M574 Y1 S3                               ; Set endstops controlled by motor load detection

; Stallgaurd Sensitivy
M915 X S3 F0 H400 R1		                ; Set X axis Sensitivity
M915 Y S3 F0 H400 R1		                ; Set y axis Sensitivity

; Z-Probe PINDA
M574 Z1 S2 ; Set endstops controlled by probe
M558 P5 C"^zprobe.in" I1 H0.9 F1000 T6000 A20 S0.005 ; PINDA
M308 S2 P"exp.thermistor_7" A"PINDA" Y"thermistor" T120000 B4725 
G31 P1000 X23 Y5 Z1.025						; PEI Sheet Offset
;G31 P1000 X23 Y5 Z1.355 					; Textured Sheet Offset
M557 X24:221 Y10:195 P12                     ; Define mesh grid

; Heatbed Heaters and Thermistor Bed 
M308 S0 P"bed_temp" Y"thermistor" T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0 Bed
M950 H0 C"bedheat" T0						; Creates Bed Heater
M307 H0 A128.0 C498.9 D4.5 V24.0 B0         ; Bed PID Calibration and PWM
M140 H0
M143 H0 S120                                ; Set temperature limit for heater 0 to 120C Bed

; Filament Sensor Port and Loading Feature ON
M950 J1 C"e0stop" ; Input 1 e0 Filament Sensor 
M581 P1 T2 S0 R0 ; Filament Sensor P1 triggers Trigger2.g always (R0)

; HotEnd Heaters and Thermistor HotEnd           
M308 S1 P"e0_temp" Y"thermistor" T100000 B4725 R4700  ; Set thermistor + ADC parameters for heater 1 HotEnd
M950 H1 C"e0heat" T1					; Create HotEnd Heater 
M307 H1 A566.8 C170.6 D5.7 V23.9 B0			; HotEnd PID Calibration and PWM
M143 H1 S300                            ; Set temperature limit for heater 1 to 280C HotEnd
M302 S195 R195

; Fans
M950 F1 C"Fan1" Q250				; Creates HOTEND Fan
M106 P1 T45 S255 H1                 ; HOTEND Fan Settings
M950 F0 C"Fan0" Q250				; Creates PARTS COOLING FAN
M106 P0 H-1                         ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off PARTS COOLING FAN

; Tools
M563 P0 D0 H1 F0                            ; Define tool 0
G10 P0 X0 Y0 Z0                             ; Set tool 0 axis offsets
G10 P0 R0 S0                                ; Set initial tool 0 active and standby temperatures to 0C

@jens55

What is your LA setting? LA normally does only retract when using very high values (long bowden setup).

I also think the filament got stuck somewhere on the way to the gears which then grinds the filament down.

Too high PLA temps could also force heat creep (clogged extruder) which then also grinds the filament down.

@fcwilt

Yes they are but not the overall Z offest because of the rising temperature of the probe.