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Title:
DEFECTIVE COMMUNICATION PATH REINPUTTING DIAGNOSTIC METHOD
Document Type and Number:
Japanese Patent JPH05252574
Kind Code:
A
Abstract:

PURPOSE: To discriminate a permanent failure, and to reproduce a communication path failure and a diagnostic process on-line at the time of a periodical inspection by adding a reinputting diagnostic program to a defective side communication path, and adding a function which forcedly switches the communication path from a central control room.

CONSTITUTION: A by-pass relay 8, photocoupler 9, double system communication path switching circuit 10, and communication control circuit 11 are connected with annular communication paths 2 and 2', and received serial information is inputted to a communication control LSI 12. Then, a double system communication path check switch 21 is set at each module, a soft enabling the forced switching of the double system communication path of the specific module from the central control room is added, and the reinputting diagnosis is added to the double system communication path diagnostic soft. The waiting system of the double system communication path can be checked on-line at the time of the periodical inspection, and the discrimination of an instantaneous failure or the permanent failure can be attained when a failure display is indicated at one communication path.


Inventors:
NAWA MASUMI
Application Number:
JP1992000046645
Publication Date:
September 28, 1993
Filing Date:
March 04, 1992
Export Citation:
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Assignee:
HITACHI LTD
HITACHI ENG CO LTD
International Classes:
G06F15/00; H04Q9/00; (IPC1-7): H04Q9/00; G06F15/00; H04Q9/00
Attorney, Agent or Firm:
小川 勝男



 
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