HI I am not an expert on modelicon. But I know that the autotuning with PID is complicated and not always reliable. For examples It does not work on all the types of process and there are a lot of drawbacks as the difficulty to control the overshoot, to take into account to large dead time, saturation ( speed) , to get a good load disturbance rejection, etc But there is another solution is to use the new controller Relaxc. ( in the slide you have all the information link) https://www.appedge.com/pdffile/relaxc_expertcontrol.pdf The practical tuning guide of relaxc( see pdf) shows how with only five graphics rules of auto tuning it is possible to tune all ( almost) the types of process. It is just necessary to identify the dead or gap time and the max speed. For that you can use the more suitable excitation for your system. ( step response, relay feedback, noise, armax or identification of the transfer function ) to measure these 2 parameters and relaxc we will give us the more secure and efficient control for our process with the best load disturbance rejection. This methodology is only possible with relaxc, because its mathematical structure allows it because Relaxc is “the plant”. As the parameter of relaxc are a physical sense, a user can checks them without calculation and adjust directly them too. You can test and verify the behavior of relaxc with the free trail version of relaxc. If you use relaxc I am thinking that many people will be interesting by your results and me too. The autotuning of relaxc is independent of the modelicon device https://shop.exchange.se.com/en-US/apps/55444/relaxc---critical-process-loop-control---trial-version I can help you to use relaxc if you want or if you have some difficulties to download relaxc. J.M ps Sorry for english
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