Title:
SAMPLING SYSTEM
Document Type and Number:
Japanese Patent JPH01116705
Kind Code:
A
Abstract:
PURPOSE:To obtain a highly reliable process variable and to decrease the processing load of a computer system by switching a sampling cycle according to the change of the process variable to a high speed and a low speed. CONSTITUTION:A cycle control part 3 operates with a basic clock, updates a cycle counter, and requires a fetching to a sampling processing part 4 in respect to an input point, which has been a sampling timing. The sampling processing part 4 fetches the process variable of said input point from a process 1 to a sampling data table 7, and activates a cycle switching part 41. The cycle switching part 41 calculates the change rate of the process variable, and switches the high-speed cycle and the low-speed cycle. Thus, the sampling processing in respect to the said input point becomes the processed cycle according to the change of the process variable, the highly-reliable process variable can be obtained, the unnecessary sampling processing in a stationary period can be eliminated, and the load of the computer system can be decreased.
Inventors:
YO TAKAO
Application Number:
JP27305687A
Publication Date:
May 09, 1989
Filing Date:
October 30, 1987
Export Citation:
Assignee:
HITACHI LTD
HITACHI ENG CO LTD
HITACHI ENG CO LTD
International Classes:
G05B21/02; (IPC1-7): G05B21/02
Attorney, Agent or Firm:
Katsuo Ogawa (2 outside)
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