| 摘要 |
<p>PURPOSE:To always confirm the contents of a PID arithmetic which is under job controlling just with observation of a display part by displaying automatically the contents of the PID arithmetic which is under selection via a display switch means on the display part. CONSTITUTION:An upper limit alarm 14 detects that the measured variable given to one of two PID arithmetic parts 8 and 12 exceeded a prescribed level. Based on the detection signal of the alarm 14, the computing result of one of both parts 8 and 12 is selected and at the same time the computing contents and the name of the selected PID arithmetic are displayed with switching by a display switching means 15. As a result, the computing results of both parts 8 and 12 can be automatically selected in response to the control state. Furthermore a present specific PID arithmetic that is performing the control is automatically displayed at a display part 17.</p> |
