DIAGNOSTIC DEVICE FOR A PROCESS CONTROL SYSTEM

摘要

The diagnostic device (10) comprises a receiving means (100) for receiving process variable values (x(t)) of a process variable of a process medium of a process, a measurement processing means (300) for extracting and recording measurement statistics data from such process variable values, which are measured during a measuring phase (300), a training processing means for extracting and recording training statistics data from such process variable values, which are measured during a training phase, and a comparison means (400) for comparing the measurement statistics data with training statistics data recorded before the measurement statistics data. Preferably, the training statistics data include a training empirical statistical distribution, which can be a distribution of a function of process variable values, which are measured during a training phase, or a distribution of a function of coefficients X<SUB>t</SUB>(k), which are coefficients of a function of a transform of process variable values (x(t)), which are measured during a training phase.