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Control system for a paper or board machine

  • US 5,381,341 A
  • Filed: 02/18/1993
  • Issued: 01/10/1995
  • Est. Priority Date: 06/01/1989
  • Status: Expired due to Term
First Claim
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1. A control system for regulating a transverse profile of a web in a paper or board machine, having a sensor for detecting the web transverse property profile and producing feedback information, said control system comprising:

  • a plurality of intelligent actuator controllers, each independently executing a predetermined control algorithm and being responsive to an actuator control parameter received as a set value controller signal from a control bus and producing an actuator control signal;

    a plurality of controllable displacement actuators arranged at profile adjustment points across the width of the web, each being responsive to said actuator control signal from a corresponding one of said plurality of intelligent actuator controllers, each of said plurality of controllable displacement actuators being effective to adjust a transverse property of the web at a corresponding profile adjustment point, said plurality of controllable displacement actuators together being effective to regulate the web transverse property profile,a process controller, having as an output said set value controller signal transmitted as said actuator control parameter for each intelligent actuator controller and receiving as an input the feedback information from the sensor;

    said data bus being common to said plurality of intelligent actuator controllers and being arranged for data communications between said process controller and said plurality of intelligent actuator controllers, said data bus comprising a serial bus, and said intelligent actuator controllers generating controller information; and

    a network server connected between said data bus and said process controller for transferring said set value controller signal from said process controller to said plurality of actuator controllers and for communicating said controller information from said intelligent actuator controllers to said process controller.

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