Hello Community! I’m working on an University project, and I’m using a PLCnext AXC F 2152 Controller. I’m using the PID_C block of the ControlTechnology library. When PID loop is stable, and SP=PV, and I change the Integral Time or the Gain, the output of the controller makes a big bump and hits zero. Then, it started to control again and bring the PV back to the SP. But I wouldn’t expect a bump when changing a PID tuning parameter, considering that when I do it SP=PV. Do you know if there’s a way to avoid this? Maybe I’m configuring somethng wrong in the Parameters or Mode words.
Hello, Unfortunately this behaviour cannot be avoided. The parameters, including the Gain and Integral Time, must be kept constant during operation. If you need more information on the technical details of this function block, you can contact the developers of this library directly, using the “Contact” button on the product page in the PLCnext Store. ~ Martin.
Martin: Thanks a lot for your fast answer! I’ll contact them! Alejandro