JPS56153401A - Setter - Google Patents

Abstract

PURPOSE:To perform bumpless changing-over of fast response speeds with high accuracy by providing a counter which makes counting in accordance with the analog signals from a backup device or the like and sets the output of a computer to a control system which incorporates the computer in a plant or the like. CONSTITUTION:A setter 6 constitutes an interface of a computer 2, an analong control device 3, a manual operating machine 4, and a plant 5, and is set in accordance with the control mode selection signal (f). First, in the manual mode, the signal (g) from the operating device 4 is inputted by the signal (f) to a calculator 64 via a signal change-over device 62. This counter 64 makes up or down counting of the reference clock signal (j) of an oscillator 63. The count output thereof is D/A converted 65, and the signal (m) is outputted to the plant 5. In the automatic mode, the analog signal (n) of the device 3 is counted 64 via a comparator 61. In the computer mode, the digital signal (k) of the computer 2 is set as it is in the counter 64. Further, the count output is fed back as signals (l), (m), whereby the bumpless changing-over is accomplished.