The Dow Chemical Company

Dow Global Technolgoies LLC

Robert J Lindesmith

Edward R Sederlund

Wayne P Dupree

Larry A Root

Augustine Tibazarwa

Johannes C Kanse

John L Clement

Eloy Baca, Jr

Helmut A Bezecny

Ernst W Quelle

Donald Grinwis

Dennis J Dunlap

Brent M Frank

Russell W Cowles

Nadene T Thomas

Lowell V Thomas

A process control system receiving input signals from a controlled apparatus and using the input signals in determining at least one output signal modifying the characteristics of at least one respective control device in the controlled apparatus where the source code for the general control of the apparatus and the source code for the safety shutdown system of the apparatus are compiled to control code in a unified compilation.

Process control system with integrated safety control system

A stealth interface for an intelligent front-end communication system couples a plurality of actively redundant process control computers to a computer network. The stealth interface in each of the actively redundant process control computers includes a multi-ported memory for storing dynamic data associated with the physical process and for transferring this data to a front end computer which is in communication with the computer network. The multi-ported memory also includes a mailbox section for storing messages sent between the front end computer and its actively redundant process control computer. The stealth interface also includes a guardian circuit which ultimately controls the ability of the front end computer to write information to specific memory locations in the multi-ported data memory.

Stealth interface for process control computers

An extended Harvard architecture memory system which features an address store for containing an ordered sequence of program memory addresses, and a value store for containing a series of related data value sets. Each of the addresses contained in the address store is associated with a distinct set of instructions, such as a subroutine, that is contained in the program memory. The address store may also contain the address of one or more instruction arguments that are, in turn, contained in the value store or in a separate data memory. Both the address store and the value store are preferably connected to the same data communication path which is used by the data memory of the computer. The value store also includes a logic interface for enabling a plurality of different address increments to be programmably selected.

Extended Harvard architecture computer memory system with programmable

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Midland, MI, United States of America

Robert J Lindesmith