How to read PT1000 value, with Neuron S103, in mervis
I have been trying to connect PT1000 to Neuron S103 AO or AI without success.
Resistance to temperature conversion has been chosen, also PT1000 is selected.
Neuron S10x_AO_1 resulting in PLC value of -246.8609 etc..
Tried following youtube tutorial with no success. Should I connect the PT1000 to AI or AO? I bet if I connect resistor to ao or ai, it still shows the same.
@Iogo Resistance measurement on S103 is available only on Analog Output (even though it sounds a bit wierd). You have to connect the sensor between AO and AGND. Did you follow the chapetr 188.8.131.52Analog Outputof group 1 (Alternatively Resistance Analog Input–Pt1000)?
Well, at first, i thought it would do these all connections internally after selection has been done with the AO/AI channel to measure resistance and just put it directly to a variable, which would have been easy.. Then I tried the function block, but as you can see..nothing
@Iogo It seems that the measured resistance is really too small = 9Ω. Is it really Pt1000? And do you really have it connected?
Btw what are the AO_moed and AO_1 variables? Are they mapped to the HW? It should be like like this. (We might need to update the documentation)
They are mapped to hw, although the name does not imply that. Exactly as in your example. Did not get it to work, so I decided to add a modbus device, 4 channel analog output module and take the pt1000 temperatures through another modbus device...seemed easier way to go =)