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Patent Searching and Data


Title:
PROXIMITY SWITCH
Document Type and Number:
Japanese Patent JPH0737475
Kind Code:
A
Abstract:

PURPOSE: To diagnose abnormality of the whole of a proximity switch regardless of existence of any object, and without affecting a normal operation condition.

CONSTITUTION: An object is detected by an oscillation circuit 1 and a signal process circuit 2, and the output is given to a detection output holding circuit 3. When there is a self-diagnosis input signal, the output is held once, and oscillation condition is reversed after a delay time passes in a delay circuit 7. When the output of the signal process circuit 2 is reversed simultaneously, an AND circuit 11 or 13 reaches an H-level, enabling the judgment of a normal condition. Since such a change does not occur in an abnormal condition, abnormal condition can thus be judged.


Inventors:
Ogata, Akimitsu
Ueda, Kenji
Honda, Ryuji
Makimoto, Noriaki
Application Number:
JP1993000202710
Publication Date:
February 07, 1995
Filing Date:
July 22, 1993
Export Citation:
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Assignee:
OMRON CORP
International Classes:
H01H36/00; (IPC1-7): H01H36/00
Attorney, Agent or Firm:
岡本 宜喜 (外1名)