公开(公告)号：EP1012682A1

公开(公告)日：2000-06-28

申请号：EP98953850.9

申请日：1998-10-21

申请人： FISHER CONTROLS INTERNATIONAL, INC.

发明人： BURNS, Harry, A. ,  LARSON, Brent, H. ,  BROWN, Larry, K.

IPC分类号： G05B19/042 ,  G05B19/418

CPC分类号： G05B19/41865 ,  G05B19/0426 ,  G05B2219/25428 ,  Y02P90/18 ,  Y02P90/20

摘要： 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 identify of the device, the identity of the control functions associated with the device, the manner in which the device communicates with other devices with respect to each of the control functions associated with that device, the timing associated with the execution of each of the control functions of that device and the timing of the communication activities associated with each of the control functions of that device. The schematic generator then analyses the retrieved data to identify the manner in which the devices are physically connected on the bus and the manner in which the different control functions are interconnected over the bus to perform process control loops within the process control network. Thereafter, the schematic generator creates one or more schematics, such a maintenance schematic illustrating the physical layout of the field devices in the process control network, a control loop schematic illustrating the interconnections between functions within one or more of the devices that form a control loop, and a timing schematic illustrating the timing of or the amount of communications occurring on the bus.

公开(公告)号：EP1012682B1

公开(公告)日：2003-05-02

申请号：EP98953850.9

申请日：1998-10-21

申请人： FISHER CONTROLS INTERNATIONAL, INC.

发明人： BURNS, Harry, A. ,  LARSON, Brent, H. ,  BROWN, Larry, K.

IPC分类号： G05B19/042 ,  G05B19/418

CPC分类号： G05B19/41865 ,  G05B19/0426 ,  G05B2219/25428 ,  Y02P90/18 ,  Y02P90/20

摘要： 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 identify of the device, the identity of the control functions associated with the device, the manner in which the device communicates with other devices with respect to each of the control functions associated with that device, the timing associated with the execution of each of the control functions of that device and the timing of the communication activities associated with each of the control functions of that device. The schematic generator then analyses the retrieved data to identify the manner in which the devices are physically connected on the bus and the manner in which the different control functions are interconnected over the bus to perform process control loops within the process control network. Thereafter, the schematic generator creates one or more schematics, such a maintenance schematic illustrating the physical layout of the field devices in the process control network, a control loop schematic illustrating the interconnections between functions within one or more of the devices that form a control loop, and a timing schematic illustrating the timing of or the amount of communications occurring on the bus.

公开(公告)号：EP0929855A1

公开(公告)日：1999-07-21

申请号：EP97909954.0

申请日：1997-10-03

申请人： FISHER CONTROLS INTERNATIONAL, INC.

发明人： BROWN, Larry, K. ,  LARSON, Brent, H. ,  BURNS, Harry, A.

IPC分类号： G05B19 ,  G05B23

CPC分类号： H04L12/40013 ,  G05B19/4185 ,  G05B23/0227 ,  G05B23/0256 ,  Y02P90/18

摘要： 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, and a display (122) for displaying the simple status. The maintenance interface device may be used for fault analysis to detect whether a field device or a communication loop is operational or nonoperational, powered or unpowered, and generating a valid communication signal or generating an invalid communication signal. The maintenance interface device is adapted to perform simple functionality tests on a plurality of devices in a process control network including a loop controller, a digital control system, an operator console, a workstation, a personal computer, and a bridge to thereby detect the functionality of those devices on a communication wire. The maintenance interface device may be self-powered, powered from the device under service, or powered from a communication media such as a bus.

公开(公告)号：EP0929850B1

公开(公告)日：2002-12-11

申请号：EP97944600.2

申请日：1997-10-01

申请人： FISHER CONTROLS INTERNATIONAL, INC.

发明人： LARSON, Brent, H. ,  BURNS, Harry, A. ,  BROWN, Larry, K.

IPC分类号： G05B19/042 ,  G05B19/418

CPC分类号： G05B19/0425 ,  G05B19/4185 ,  G05B2219/25428 ,  G05B2219/31211 ,  G05B2219/33326 ,  G05B2219/33331 ,  G05B2219/34427 ,  Y02P90/18 ,  Y02P90/86

摘要： 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 stores a diagnostic test routine having a series of device or process diagnostic test instructions, and a controller that performs the device or process diagnostic test instructions stored in the memory to implement a device or process diagnostic test using the field device. A data collection unit within the field device collects diagnostic data generated during the diagnostic test and a communication unit communicates the collected diagnostic data over the bus to a host device for processing. The controller may include a program language interpreter adapted to interpret the diagnostic test instructions which may be provided to the field device from another one of the devices via the bus.

公开(公告)号：EP0929854B1

公开(公告)日：2001-04-25

申请号：EP97944499.9

申请日：1997-09-26

申请人： FISHER CONTROLS INTERNATIONAL, INC.

发明人： LARSON, Brent, H. ,  BURNS, Harry, A. ,  BROWN, Larry, K.

IPC分类号： G05B19/418

CPC分类号： G05B19/4185 ,  G05B19/4184 ,  G05B2219/31113 ,  G05B2219/31119 ,  G05B2219/31121 ,  G05B2219/31211 ,  G05B2219/33273 ,  G05B2219/33326 ,  G05B2219/34427 ,  G05B2219/45226 ,  Y02P90/14 ,  Y02P90/18 ,  Y02P90/20 ,  Y02P90/86

摘要： 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 include an operational scheduler that schedules the execution of each of a number of process control functions and communication functions performed by the field devices to define a process control scheme and an indicator that indicates one or more process control scheme locations at which the process control scheme is to be automatically or conditionally interrupted to thereby enable debugging and/or tuning of the process control network. A controller interrupts execution of the process control scheme at the indicated flow locations, communicates process data to a user to display the current or a past state of the process to a user and waits for user input before continuing with operation of the process control scheme. In a tuning mode, the controller delivers data pertaining to a process parameter to a tuning device or to a user which determines a new tuning parameter, such as a gain, to be used within the process control scheme based on the process parameter data.

公开(公告)号：EP0929854A1

公开(公告)日：1999-07-21

申请号：EP97944499.0

申请日：1997-09-26

申请人： FISHER CONTROLS INTERNATIONAL, INC.

发明人： LARSON, Brent, H. ,  BURNS, Harry, A. ,  BROWN, Larry, K.

IPC分类号： G05B19

CPC分类号： G05B19/4185 ,  G05B19/4184 ,  G05B2219/31113 ,  G05B2219/31119 ,  G05B2219/31121 ,  G05B2219/31211 ,  G05B2219/33273 ,  G05B2219/33326 ,  G05B2219/34427 ,  G05B2219/45226 ,  Y02P90/14 ,  Y02P90/18 ,  Y02P90/20 ,  Y02P90/86

摘要： 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 include an operational scheduler that schedules the execution of each of a number of process control functions and communication functions performed by the field devices to define a process control scheme and an indicator that indicates one or more process control scheme locations at which the process control scheme is to be automatically or conditionally interrupted to thereby enable debugging and/or tuning of the process control network. A controller interrupts execution of the process control scheme at the indicated flow locations, communicates process data to a user to display the current or a past state of the process to a user and waits for user input before continuing with operation of the process control scheme. In a tuning mode, the controller delivers data pertaining to a process parameter to a tuning device or to a user which determines a new tuning parameter, such as a gain, to be used within the process control scheme based on the process parameter data.

公开(公告)号：EP1019825B1

公开(公告)日：2002-02-13

申请号：EP98938115.7

申请日：1998-07-30

申请人： FISHER CONTROLS INTERNATIONAL, INC.

发明人： LARSON, Brent, H. ,  BURNS, Harry, A. ,  BROWN, Larry, K.

IPC分类号： G06F11/22

CPC分类号： G06F11/22

摘要： 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 using scheduled periodic communications. The diagnostic system is disposed in a first one of the devices and includes a signal generator that produces a diagnostic control signal, a communicator configured to deliver the diagnostic control signal to a second one of the devices using scheduled periodic communications, and an output signal receiver adapted to receive an output signal developed by the second device in response to the diagnostic control signal. The diagnostic system may use the received output signal to perform diagnostics or may send this signal to a host device for diagnostic analysis.

公开(公告)号：EP1019825A1

公开(公告)日：2000-07-19

申请号：EP98938115.7

申请日：1998-07-30

申请人： FISHER CONTROLS INTERNATIONAL, INC.

发明人： LARSON, Brent, H. ,  BURNS, Harry, A. ,  BROWN, Larry, K.

IPC分类号： G06F11/22

CPC分类号： G06F11/22

摘要： 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 using scheduled periodic communications. The diagnostic system is disposed in a first one of the devices and includes a signal generator that produces a diagnostic control signal, a communicator configured to deliver the diagnostic control signal to a second one of the devices using scheduled periodic communications, and an output signal receiver adapted to receive an output signal developed by the second device in response to the diagnostic control signal. The diagnostic system may use the received output signal to perform diagnostics or may send this signal to a host device for diagnostic analysis.

公开(公告)号：EP0931284A1

公开(公告)日：1999-07-28

申请号：EP97945512.0

申请日：1997-10-03

申请人： FISHER CONTROLS INTERNATIONAL, INC.

发明人： BURNS, Harry, A. ,  LARSON, Brent, H. ,  BROWN, Larry, K.

IPC分类号： G05B19 ,  G06F15

CPC分类号： G05B19/4184 ,  G05B19/41855 ,  G05B2219/24175 ,  G05B2219/24182 ,  G05B2219/31121 ,  G05B2219/31245 ,  Y02P90/14 ,  Y02P90/185

摘要： 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 of a primary process loop element to a secondary process loop element in the event of a failure of the primary process loop element. Redundancy is selectively implemented using a redundant pair of field devices or a redundant bus pair having a primary bus and a redundant bus. In a first case, redundancey is selectively implemented using a single set of communication media (202 in fig. 6), such as a single communication loop, but implementing redundant functional elements (204, 206), such as field devices, so that recovery is achieved upon failure of a functional element but not upon failure of the communication media. In a second case, redundancy is selectively implemented using a redundant set of communication media (302, 303 in fig. 7) in addition to use of redundant devices (304, 306) so that recovery is attained both for a failing device and a failing communication media. In a third case, redundancy is selectively implemented using a redundant set of communication media (402, 403 in fig. 8) but using a single device (404) so that recovery is attained for a failing communication media but not for a failing device.

公开(公告)号：EP1090333B1

公开(公告)日：2004-01-07

申请号：EP99914089.0

申请日：1999-03-24

申请人： FISHER CONTROLS INTERNATIONAL, INC.

发明人： BROWN, Larry, K. ,  LARSON, Brent, H. ,  BURNS, Harry, A.

IPC分类号： G05B19/042 ,  G05B19/418

CPC分类号： G05B19/4185 ,  G05B19/0425 ,  G05B19/406 ,  G05B2219/25428 ,  G05B2219/31121 ,  G05B2219/31122 ,  G05B2219/31135 ,  G05B2219/31436 ,  G05B2219/31455 ,  Y02P90/18 ,  Y02P90/20

摘要： 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 invention use scheduled periodic communications to send signals containing, for example, measured values of process parameters developed by field devices to a centralized viewing device. The viewing device receives the signals and stores at least one value of the process parameters, and maybe more values if necessary to monitor and control the process. To retrieve the stored process parameters for viewing, the viewing device processes messages from humain interface devices requesting the stored values of one or more of the stored parameters and then transmits response messages containing the stored values. The humain interface device may be the same device as the viewing device, or may be a separate device that communicates with the viewing device using either the same or a different communication protocol as that used by the field devices to communicate with the viewing device. Additionally, the request and response messages may be sent between the devices using unscheduled queued communications.