PT100 Temperature Fault constant in 2000 Celcius (Config Issue)

[Riev]

I have Heatbed Heater with a Thermistor in Heater 0 (P0 Parameter) and Extruder Heater with 2 wires PT100 Temperature Sensor (with Duet PT100 Daughter Board) in Heater 1 (P1 Parameter).

Actually I have problem in PT100 Temperature Reading, I use 100 Ohm Test Resistor to check reading in 0 Celcius. But Heater 1 temperature reading always show in 2000 Celcius.

I checked in Config.g File and make several trial configuration :

1. Enable both H0 and H1

I turned off Duet and restart, Actual reading is

2. Disable H0 and Enable H1

I turned off Duet and restart, Actual Reading is

3. Disable H0 and Enable H1, but without write "R4700" in H1

I turned off Duet and restart, Actual reading is

4. Enable H0 without "R4700" and Enable H1 without "R4700"

I turned off Duet and restart, Actual Reading is CORRECT

It seems H1 will be problem if "R4700" is written, but in H0 has no problem if "R4700" is written (when both is enabled).

Can you explain why "R4700" parameter in H1 setting make H1 reading is incorrect?
May I run the printer without "R4700" written in configuration file ?

[Veti]

https://duet3d.dozuki.com/Wiki/Connecting_PT100_temperature_sensors

you can optionally use the R parameter to specify the value of the reference resistor if it is not 400 ohms.

4700 is for thermistors. the daughterboard has a different resistor.

[Riev]

@veti Parameter R4700 for PT100 is automatically generated by RRF Configurator, it is default mode. I just selected sensor channel like picture below.

[Veti]

yes that is a bug