1
Harry A Burns, Brent H Larson, Larry K Brown: Local device and process diagnostics in a process control network having distributed control functions. Fisher Controls International, Marshall O Toole Gerstein Murray & Borun, February 15, 2000: US06026352 (175 worldwide citation)

A field device for use in a process control network having a plurality of devices communicatively coupled by a two-wire, all-digital communication bus includes a connector that connects the field device to the two-wire, all-digital bus to enable all-digital communication over the bus, a memory that ...


2
Harry A Burns, Brent H Larson, Larry K Brown: Local device and process diagnostics in a process control network having distributed control functions. Fisher Controls International, Marshall O Toole Gerstein Murray & Borun, October 19, 1999: US05970430 (162 worldwide citation)

A field device for use in a process control network having a plurality of devices communicatively coupled by a two-wire, all-digital communication bus includes a connector that connects the field device to the two-wire, all-digital bus to enable all-digital communication over the bus, a memory that ...


3
Brent H Larson, Harry A Burns, Larry K Brown: Remote diagnostics in a process control network having distributed control functions. Fisher Controls International, Marshall O Toole Gerstein Murray & Borun, January 11, 2000: US06014612 (121 worldwide citation)

A diagnostic system is adapted to perform device and process diagnostics in a process control network having a plurality of process control devices communicatively linked over a bus, wherein each of the devices is capable of preforming a process control function and of communicating over the bus usi ...


4
Harry A Burns, Brent H Larson, Larry K Brown: Process control network with redundant field devices and buses. Fisher Controls International, Marshall O Toole Gerstein Murray & Borun, April 4, 2000: US06047222 (121 worldwide citation)

Functional elements within a two-wire, loop-powered, two-way digital communications environment are interconnected using selective redundant connections and selective redundant functional elements. The redundant functional elements and redundant connections provide a smooth transition from operation ...


5
Larry K Brown, Harry A Burns, Brent H Larson: Network accessible interface for a process control network. Fisher Controls International, Marshall O&apos Toole Gerstein Murray & Borun, February 20, 2001: US06192281 (113 worldwide citation)

An interface between a remote communications network and a process control system includes a storage device, a communication software stack and a user software layer. The user software layer enables interfacing between the remote communications network and the process control system by directing the ...


6
Larry K Brown, Brent H Larson, Harry A Burns: Maintenance interface device for a use in a process control network. Fisher Controls International, Marshall O&apos Toole Gerstein Murray & Borun, April 23, 2002: US06377859 (93 worldwide citation)

A maintenance interface device for use in a digital, loop-powered process control network includes an interface to either a two-wire input/output port of a field device or to a two-wire communication media, a control logic for determining a simple status of the field device or communication loop, an ...


7
Larry K Brown, Brent H Larson, Harry A Burns: Function block apparatus for viewing data in a process control system. Fisher Controls International, Marshall O&apos Toole Gerstein Murray & Borun, September 4, 2001: US06285966 (67 worldwide citation)

The present invention is directed to a method of and a device for monitoring, from a central location, the current operating conditions (such as values of process parameters) in a process control network having distributed control functions. In one embodiment, the method and device of the present in ...


8
Harry A Burns, Brent H Larson, Larry K Brown: Schematic generator for use in a process control network having distributed control functions. Fisher Controls International, Marshall O Toole Gerstein Murray & Borun, July 11, 2000: US06088665 (50 worldwide citation)

A schematic generator for use in a process control network, in which control functions are implemented by field devices interconnected at various and distributed locations on a bus, polls each of the field devices to retrieve information pertaining to the identity of the device, the identity of the ...


9
Brent H Larson, Harry A Burns, Larry K Brown: Method and apparatus for debugging and tuning a process control network having distributed control functions. Fisher Controls International, Marshall O Toole Gerstein Murray & Borun, March 28, 2000: US06044305 (45 worldwide citation)

A system and method for debugging and tuning a process control network having distributed control functions implemented by a set of field devices communicatively linked over a bus includes an operational scheduler that schedules the execution of each of a number of process control functions and comm ...


10
Brent H Larson, Harry A Burns, Larry Keith Brown: Method for detecting broken valve stem. Fisher Controls International, Marshall Gerstein & Borun, May 7, 2002: US06382226 (32 worldwide citation)

A method for providing an indication and alarm of a possible failure in a fluid control valve stem, plug or seat in a process control system having a microprocessor based valve positioner. The drive pressure, drive signal and valve position feedback are monitored. If greater than a predetermined cha ...