| 摘要 |
PURPOSE:To prevent overshooting, by controlling a manipulated variable through a relatively fast responding control system when an input signal has a reference value and below, or limiting the manipulated variable through a relatively slow responding control system when the input signal has the reference value or above. CONSTITUTION:A setting part 4 sets and stores the reference value PV1 of an input signal PV for limiting a manipulated variable MV while referring to a display device 5 and the set value MV1 of the manipulated variable limited according to whether the input value is above or below the reference value PV1 in a memory 6. A central processing unit 7 compares the input signal PV with a desired value to perform PID operation, and then compares the output manipulated variable MV(%) with the reference value PV1; when the input signal PV is above the reference value PV1, it outputs the manipulated variable MV with the manipulated variable MV below the set value MV1, or the limited manipulated variable MV1 with the MV above the set value MV1. When the input signal PV is above the reference value PV1, the manipulated variable MV is outputted. Further, limiting the manipulated variable above the reference value PV1 is performed similarly. |
