Hello! Readings from my sensors are very slow. 12-16s per reading.

I have three DS18B20-sensors wired to GPIO 4.

I used the example program which came with Codesys - then built my program in there.

I've read something about putting the onewire-stuff in another POU/task but I don't get it.

What goes inside the onewire-task? This code?

PROGRAM PLC_PRG
VAR
   astrID: ARRAY[1..20] OF STRING;
   ui: uINT;
   x: BOOL;
   rTemp: REAL;
END_VAR

IF NOT x THEN
   x := TRUE;
   //scan function
   FOR ui:=1 TO MIN(Onewire_master.uiScannedDevices, 20) DO
      astrID[ui] := Onewire_master.pasScannedDevices^[ui-1].StringRepresentation;
   END_FOR
END_IF

I'm ok with 750ms delay per sensor but 12-16s is too much. I am using the temperaturs to control some relays. With only one sensor configured it works fine.

BUMP

Anyone, please?

Hi,
for temprature reading this should never be a problem... what application do you have which need faster temp?
We just read then onewire via kernel modul which is providey by RaspberryPI.org
so each reading is like for example:
cat /sys/bus/w1/devices/10-000802cfb15d/w1_slave
If you so this manually via console with your sensors guess you will see these delays too.

BR
Edwin