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Hi All, I'm new to the PID/Autotune function and am having some issues getting a closed feedback loop up and running. To simplify my problem, I have a V130-J-TR6 with an IO-AI4-AO2 expansion module. I have a fan that is driven by a 0-10V analog analog output, and a duct setup to measure airflow using a pressure transducer with 4-20mA analog signal (Kimo CP201). The fan is connected to the 12Bit expansion module. The transducer is connected to an analog input on the PLC so it is 10-bit. From the sensor display I know the following: 1.2V ----> 0L/s (the fan doesn't cut in until voltage exceeds at least 1.2V) 10V----> 250L/s What I want to do is maintain a constant flow-rate of 175L/s but I don't completely understand how to set autotune up or what it's doing. Can someone please provide me some example ladder logic or .vlp file. I have tried using the v120 example in the help files with no luck. Surely this is a common application. All my equipment is new and I've run diagnostics with the multimeter so I know its not a hardware issue. Thanks