Title:
AUTOMATIC CONTROLLING DEVICE
Document Type and Number:
Japanese Patent JPS58146903
Kind Code:
A
Abstract:
PURPOSE:To reduce the load of a CPU by comparing a value obtained by digitizing a measured value inputted from a process to be controlled with a set value, and when the difference is less than a fixed value, processing the input value regarding that the period of the input value is equal to that of the signal just before said input signal. CONSTITUTION:A signal M obtained by digitizing a signal from a process system to be controlled is inputted to a controller 31 incorporating a CPU and operated together with a set input value S and the operated result is inputted to a holding circuit 34 through a switch 34 as output information. On the other hand, the data M and S are inputted to a comparator 33, and when the absolute value of the difference between the data M, S is less than a prescribed value, the comparator 33 inhibits the operation of the controlling circuit 31 and opens the switch 34 to make the holding circuit 32 hold the value of the preceding period. Thus the load of the CPU in the controlling circuit 31 is reduced.
Inventors:
NEZU KAZUO
Application Number:
JP3025882A
Publication Date:
September 01, 1983
Filing Date:
February 26, 1982
Export Citation:
Assignee:
YOKOGAWA ELECTRIC WORKS LTD
International Classes:
G05B15/02; G05B21/02; (IPC1-7): G05B21/02
Attorney, Agent or Firm:
Naotaka Ide