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Plant management system

  • US 4,607,256 A
  • Filed: 10/07/1983
  • Issued: 08/19/1986
  • Est. Priority Date: 10/07/1983
  • Status: Expired due to Term
First Claim
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1. A plant management system, comprising:

  • a digital process control and data acquisition subsystem including process controller and process interface units and a data highway, said units communicting with one another by means of the data highway; and

    a token-passing plant control network, said network including;

    communication bus means;

    a plurality of module means of differing types communicating with one another by transmitting and receiving binary signals over the bus means;

    one type of said module means providing communication between modules of the control network and units of said subsystem utilizing the data highway of said subsystem; and

    a second type of said module means providing a plant-wide operator control station.

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