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Data collecting method and apparatus for loop-linked control system

  • US 4,903,190 A
  • Filed: 01/29/1988
  • Issued: 02/20/1990
  • Est. Priority Date: 01/30/1987
  • Status: Expired due to Term
First Claim
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1. A method of data transmission for a loop-linked processor system in which a plurality of processor means are linked together by a data transmission loop through a plurality of transmission controller means, each processor means having an internal memory not directly accessible from the data transmission loop, each transmission controller means having a common memory directly accessible from the data transmission loop, the method comprising the steps of:

  • reserving a first portion of each common memory for a command signal from one processor means commanding to bring data in the internal memory of another processor means to the common memory of the corresponding transmission controller means;

    bringing data in the internal memory of one of the processor means to the common memory of the corresponding transmission controller means, only when the command signal from another processor means is received; and

    reserving a second portion of each common memory for those data originally in the internal memory of one processor means which has been brought to the common memory of the corresponding transmission controller means.

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