It seems like the whole connection up to Codesys is fine. When I delete the UniPi_AI I2C module and instead of that insert the MCP3424, I do get data, but it doesn't seem correct. Even if I leave the Unipi AI module and then use the, ADR(baReadBufferV), 4); command, it shows data in the buffers that varies when the input voltage is adjusted.. Does anyone have more info on the UniPi_AI I2C chip driver?