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Industrial control system with interconnected remotely located computer control units

  • US 4,304,001 A
  • Filed: 01/24/1980
  • Issued: 12/01/1981
  • Est. Priority Date: 01/24/1980
  • Status: Expired due to Term
First Claim
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1. An information transfer system for transmitting digital information between active devices and testing the validity of the transmitted information, said system comprising:

  • at least one active device for transmitting information in digital form;

    at least one other active device for receiving information in digital form;

    plural independent communication channels connected to and extending between said first-mentioned and said second-mentioned active devices for conveying information therebetween;

    said first-mentioned active device including a transmission means for transmitting digital information arranged in blocks of predetermined format, said transmission means transmitting an identical block on each of said plural communication channels; and

    said second-mentioned active device including receiving means for receiving digital information transmitted by said first-mentioned active device and for selecting one of said plural communication channels and testing the validity of the received block and, when said received block from said first-selected communication channel is found invalid, for selecting another of said plural communication channels and testing the validity of the received block on said other communication channel.

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