Although feedback control in distributed-type instrumentation systems is still centered about PID control, “advanced control” techniques which make use of the special features of digital equipment are also coming into wide use. Many functions which have been difficult to realize in analog devices can now be implemented relatively easy in a digital format. For example, dead-time units and also complicated loops such as non-interacting control can be easily accommodated in digital systems. This chapter describes advanced control as a control format on a somewhat higher level than PID control having relatively high applicability.
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