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System for software update in manner based on processing properties of devices via maintenance network while allowing data transmission between devices on another network

  • US 5,859,977 A
  • Filed: 05/30/1995
  • Issued: 01/12/1999
  • Est. Priority Date: 10/18/1991
  • Status: Expired due to Fees
First Claim
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1. A network system comprising:

  • a plurality of networks;

    a plurality of processing devices connected to said networks, wherein at least one of said processing devices is set as a management processing device and the remaining processing devices are divided into a plurality of groups based on processing properties of said processing devices, said groups including at least a processing device group for performing processing of an information system and a processing device group for performing processing of a control system,said group which performs the processing of the control system comprises processing for rewriting a data base corresponding to a controlled system or processing for directly accessing a controlled system, and wherein said group which performs the processing of an information system comprises processing other than rewriting the data base corresponding to the controlled system or directly accessing the controlled system; and

    software maintenance means stored in said management processing device for maintenance of software which runs on said processing devices, said software maintenance means including a database storing, for each of the processing devices, information identifying the group to which said device belongs and the manner in which the software for said device is to be updated by said software maintenance means;

    wherein one of said networks is a maintenance network for distributing a program to a processing device of one of said groups identified in said database to be managed under control of said software maintenance means, said maintenance carried out only on said maintenance network while allowing data transmission between said processing devices on at least a network different from said maintenance network.

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