aawilliams

I am not aware of a good way to directly output an analog signal from these sensors.  Sensirion's documents seem to indicate that this style sensor is not compatible with the SCC1-Analog cable that they offer for some of their other products.  The flow sensor itself has an I2C output.  If paired with the SCC1-RS485 cable you can get an RS485 serial output.  You would need the following to make the correct physical connections, while also providing +5VDC to the SCC1-RS485 cable on the non-data conductors. Flow Sensor <-> 6 pin connector to 4 pin M8 adapter cable <-> SCC1-RS485 cable <-> Allen Bradley ASCII module, such as 1769-ASCII. https://www.mouser.com/pdfDocs/Sensirion_Liquid_Flow_Meters_Operating_Guidelines_.pdf   On the software side it is possible but not trivial to poll the flow sensor using the SHDLC protocol referenced in your manual.  Encoding/decoding the command and response frames is sort of a pain in the PLC.  Maybe there is a better way.