| 摘要 |
<p>PURPOSE:To improve the efficiency of the diagnosis of a plant by constituting the device in such a way that data are tentatively preserved and, at the same time, the data sampling period is automatically set in accordance with the changing state of the data so that collective recording and retrieval of the data can be managed easily. CONSTITUTION:When minute unforeseen abnormality occurs in analog signals only, the raw data before and after the abnormality are recorded by means of an abrupt change sensor 8. Accordingly, an abrupt change sensing and calculating data sampling period setting processes are stopped while the raw data are recorded so as to prevent occurrence of a malfunction. When an output changing operation by which only analog signals show a relatively fast change occurs, a calculating data sampling period setting device 5 discriminates the output of a changing rate measuring instrument 7 and changes the sampling period and records calculated data. An abrupt change in digital signals is also processed similarly to the abrupt change in analog signals. Therefore, state data obtained from the operations of various parts of a plant can be recorded accurately and, at the same time, retrieval and output after reproduction and edition of data can be carried out quickly. Thus plant diagnosis can be made effectively.</p> |
