Title:
MASTER/SLAVE CONTROLLER FOR STAND-BY DOUBLE PROCESSING SYSTEM
Document Type and Number:
Japanese Patent JPH0319001
Kind Code:
A
Abstract:
PURPOSE:To attain the master/slave designation of a stand-by double system at a low cost by forming a communication network where one of systems of a general-purpose control computer is defined as a master station with other systems used as slave stations and at the same time connecting a shared memory to a bus line which secures connection among those systems. CONSTITUTION:Plural double processing systems A, A2, B1, B2 - N1, N2 are prepared together with a bus line (l), a shared memory (m), and a system switch control means. This control means switches an abnormal master system to a normal slave system and then an abnormal slave system to the normal master system respectively after a master station reads the working states of slave stations recorded in the memory (m). Furthermore the slave stations read the working state of the master station recorded in the memory (m) and a double system where the master station is replaced with another when the master system has abnormality functions to decide the master/slave relation in response to a report of one of those slave stations. Thus it is possible to obtain a stand-by double processing system where the hard constitution is simplified and the master/slave relation can be decided in a fail-safe way.
Inventors:
ABE MASAO
Application Number:
JP15365989A
Publication Date:
January 28, 1991
Filing Date:
June 16, 1989
Export Citation:
Assignee:
NIPPON SIGNAL CO LTD
International Classes:
G05B7/02; B61L19/06; B61L27/00; G05B9/03; (IPC1-7): B61L19/06; B61L27/00; G05B7/02; G05B9/03
Attorney, Agent or Firm:
Mitsumasa Ishii
Next Patent: JPH0319002