| 摘要 |
PURPOSE:To prevent variation in process value and to perform automatic operation by using comparators, switches, etc., to prevent the integral saturation of a controller. CONSTITUTION:A process signal Pa from a detector 6a is compared with a set signal Sa from a setter 1a by a comparator 2a, whose output is inputted to a switch 4a. Its output signal is processed by a computing element 3a and then sent as an output Qa to a switching signal generator 8 and a comparator 2c. Further, a process signal Pb from a detector 6b is compared and processed 2b and 3b as mentioned above to obtain an output Qb. This switching signal generator 8 outputs a switching signal Tc to switches 4a-4c with a signal from an external switching command device 7, etc., and a selected computing element output signal is sent as an operation signal R to an operating device 5 and comparators 2c and 2d. The switches switch an input signal to a computing element to an operation signal R from a detector to the operating device 5 by the switch to prevent the integral saturation of the computing element. |
