Step number one in the solution of any control problem is to first assure that the process can be controlled well. If, for example, you have an industrial oven which is heated by a gas burner, can you disconnect the mechanical linkage between the servo motor and the throttle and then adequately control the temperature by physically moving the throttle? If you can’t, then maybe you have a problem that the most finely tuned PID loop can never control! Assuming that you can control your process manually, continue on…
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RSLogix 500 PID.pdf (82.9 KB)