Supervisory control system

Abstract

Abstract A SUPERVISORY CONTROL SYSTEM HAVING THREE INDEPENDENT CONTROL LINKS. A FIRST ONE OF THE CONTROL LINKS EMBODIES DIRECT DIGITAL CONTROL, THE SECOND, AUTOMATIC OR SEMIAUTOMATIC ANALOG CONTROL, AND THE THIRD, MANUAL CONTROL, EACH CONTROL LINK CAN INDEPENDENTLY SUPPLY A SIGNAL TO DIRECT A PROCESS BEING CONTROLLED. THE FIRST CONTROL LINK INCLUDES AN ANALOG MEMORY AMPLIFIER RECEIVING ANALOG SIGNALS FROM A CENTRAL CONTROL UNIT AND SUPPLYING AN OUTPUT ANALOG CONTROL SIGNAL. THE SECOND CONTROL LINK COMPRISES A KNOWN TYPE ANALOG CONTROLLER CONTROLLABLE BY AN ANALOG MEMORY AMPLIFIER WHICH IS PRESET DURING DIGITAL CONTROL RECEIVING A SIGNAL INDICATING THE FIRST CNTROLLER ANALOG SIGNAL AS THE VARIABLE INPUT SUCH THAT TRANSFER BETWEEN FIRST CONTROLLER AND THE SECOND CONTROLLER IS "BUMPLESS." THE FIRST AND SECOND CONTROL LINKS ALSO RECEIVE THE SAME VARIABLES WHEN THE SYSTEM IS UNDER MANUAL CONTROL TO FACILITATE BUMPLESS TRANSFER FROM MANUAL CONTROL TO ANALOG OR DIGITAL CONTROL. THE PROCESS-VARIABLE SIGNALS ARE RETURNED TO A DIGITAL CONTROL UNIT WHICH INTEGRATES THE VARIABLES IN THE SYSTEM. THE ANALOG CONTROL SIGNAL FROM A DIGITAL CONTROL UNIT IS MULTIPLEXED TO A PLURALITY OF PROCESS-CONTROL STATIONS, EACH OF WHICH HAS THREE INDEPENDENT CONTROLLERS. ADDRESS SELECTION IS PROVIDED.

Inventors

• 👤 Lawrence R Smith

Bibliographic Details