Title:
DUPLEX SYSTEM DEVICE
Document Type and Number:
Japanese Patent JP3497855
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To diagnose both a safe side failure and a dangerous side failure of an output circuit by a simple configuration in a duplex system device.
SOLUTION: The duplex system device has a synchronizing means of synchronizing operations of MPUs of each system, inter-system interface means of exchanging data of each system, output means respectively connected to a system bus of each system and having an output side of each output circuit connected to another device in a wired OR state, sensors detecting each output state of each output circuit, a stopping means of alternately stopping outputs of either one of the output circuits for a predetermined time when a drive output to the other device is being carried out, and an output circuit diagnosing means of diagnosing that there is a failure in an output circuit when output data of a sensor regarding a stopped output circuit is a logic value '1' or output data of a sensor regarding an operating output circuit is a logic value '0'.
Inventors:
Masatoshi Umeyama
Application Number:
JP2002345132A
Publication Date:
February 16, 2004
Filing Date:
April 07, 1994
Export Citation:
Assignee:
Nippon Signal Co., Ltd.
International Classes:
G06F11/18; B61L19/06; H03K19/20; (IPC1-7): G06F11/18; B61L19/06
Domestic Patent References:
| JP7277191A | ||||
| JP7248803A | ||||
| JP6324901A | ||||
| JP5173984A | ||||
| JP4302332A | ||||
| JP58218724A |
Attorney, Agent or Firm:
Mitsumasa Ishii
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