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Robustness, discussed in this paper as degree of stability, is a critically important control loop property. Robustness of control loop tuning determines the range of acceptable operation for the control loop and must be considered in conjunction with performance objectives such as regulatory and setpoint response. Interaction of performance and robustness can make loop tuning difficult and tedious. This paper describes a tuning method whereby robustness is selected and tuning parameters are returned, together with a presentation of performance, reversing the normal procedure. Discussed is the mathematical andlogical development of a robustness map presentation and, how it can be combined with simulation and loop auto-tuning facilities to create a highly informative, yet simple approach to robustness based loop tuning.
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