how can the logo read my sensor correctly?

Could it be that you are misinterpreting something?

Is it possible that by 297 you mean the units (possibly 0-1000)?
If so, then this is not the temperature.
With 297 units of AI, this corresponds to 24 °C (without a decimal place) and 24.3 °C (with one decimal place).

ali clever

hi engineer .you can use SFC105 block for scale analog in the 0_500 c range then you should pt100 put in the mixture of water and ice and wait a minute until temperate of pt100 comes to 0c then you read output SFC105 block if output isn't 0c you should use math function for offset output .

kind regards

Wow ...

I would like to see how you get an "SFC105" block into a LOGO! program.

If you can do that, I'll give you a medal...