| 摘要 |
<p>A trip system (TA) e.g. for chemical plant, incorporating a computer to check on malfunctions. The inputs and outputs (DPU1, DPU2) of the trip apparatus (TA) are fed to data processing means producing signals indicative of the input and output states of the trip apparatus (TA). One of these signals produces, by reference to a programmed <<model>>, a signal indicative of what output (or input) state should correspond to the actual input (or output) state. The signal indicative of the predicted output (or input) state is compared in a comparator (C) with the signal corresponding to the actual output (or input) state (DPU1, DPU3, DPU2). Any difference between the actual and predicted states indicates a malfunction.</p> |
