Title:
FAIL-SAFE CONTROLLER
Document Type and Number:
WIPO Patent Application WO/2000/005630
Kind Code:
A1
Abstract:
A fail-safe controller used for easily write and change an arithmetic operation program and improving the productivity of a system. A fail-safe controller (1) includes a control arithmetic unit (10) and an output unit (11). The control arithmetic unit (10) receives a state input (3) of a controlled system, performs arithmetic operations, and outputs the results of arithmetic operation as an arithmetic operation output (12). The output unit (11) has a timer (110), an alternating signal output section (111), and an output monitoring section (112). The output unit (11) converts the arithmetic operation output (12) from the control arithmetic unit (10) to an alternating signal asynchronously with the arithmetic operation of the control arithmetic unit (10) by use of a timer interruption (113) and monitors the output signal (114) from the alternating signal output section (111) so as to control the output/stop of a control output (2). The control arithmetic operation unit (10) outputs a control cycle start trigger (13) and feeds it to the alternating signal output section (111) and the output monitoring section (112).
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Inventors:
TAKEHARA TAKESHI
YAMAGUCHI SHINICHIRO
MIYAZAKI NAOTO
FUJIWARA MICHIO
YAMAGUCHI SHINICHIRO
MIYAZAKI NAOTO
FUJIWARA MICHIO
Application Number:
PCT/JP1999/003871
Publication Date:
February 03, 2000
Filing Date:
July 16, 1999
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
G05B9/02; (IPC1-7): G05B9/02; G05B23/02
Foreign References:
| JPH086602A | 1996-01-12 | |||
| JPH03147002A | 1991-06-24 |
Other References:
See also references of EP 1132788A4
Attorney, Agent or Firm:
Takada, Yukihiko (Saiwai-cho 2-chome Hitachi-shi Ibaraki, JP)
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