Hello. I need to connect a PT100 (2 wires) to an AM2 RTD module (version OBA1).  I use the base logo model 230RC, version OBA5

The light is solid red. I don't know when it should change to green, and there's no analog 1 value on the display. What voltage should I measure at the PT100 connection?

 Thanks for the help.

Please write the complete order number.

Ends the order number with 0BA2 then is the module not compatible with a LOGO! 0BA5.

Read also this Siemens FAQ:

Compatibility overview of LOGO! Basic and LOGO! Expansion modules.

IT'S AN AM2 RTD-OBA1 MODULE. IT SHOULD BE COMPATIBLE WITH THE OBA5 CPU

Okay. That's correct. Sorry for my ignorance. Now the LED is green, and I read the value in AI 1. Thank you very much, and best regards.

I'm glad it's working now.

The main thing is, that it's working now.