T he impact on performance when we adjust control loop sample time while keeping the tuning of a PI controller fixed, and In this article we explore both sample time issues. Sample time should be 10 times per process time constant or faster (T ≤ 0.1 Tp). Best practice for both control loop sample time and bump test data collection are the same: Best Practice: Sampling fast will not necessarily provide better performance, though it may lead us to spend more than necessary on high-end instrumentation and computing resources.įast and slow are relative terms defined by the process time constant, Tp. In both cases, sampling too slow will have a negative impact on performance. The other is the rate at which CO and PV data are sampled and recorded during a bump test (step 2 of the recipe). One is the control loop sample time (step 4 of the design and tuning recipe) that specifies how often the controller samples the measured process variable (PV) and computes and transmits a new controller output (CO) signal. There are two sample times, T, used in process controller design and tuning.
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