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    • 2. 发明授权
    • Process I/O to fieldbus interface circuit
    • 对现场总线接口电路进行I / O处理
    • US5764891A
    • 1998-06-09
    • US602712
    • 1996-02-15
    • Jogesh Warrior
    • Jogesh Warrior
    • G05B19/418H04L12/40G06F17/00
    • G05B19/4185H04L12/40G05B2219/31126H04L2012/40221Y02P90/18
    • A field device such as a transmitter in a process control system includes conversion circuitry coupled between Fieldbus interface circuitry and transmitter interface circuitry. The transmitter includes a transducer for sensing a process variable and providing a transducer output. Measurement circuitry couples to the transducer output, processes the transducer output and provides a measurement output. The transmitter interface circuitry couples to the measurement circuitry and provides an interface output representative of the measurement output. Further, the transmitter interface circuitry receives a transmitter command and responds in accordance with the transmitter command. The Fieldbus interface circuitry is adapted to couple to a process control loop which operates in accordance with the Fieldbus standard.
    • 诸如过程控制系统中的发射机的现场设备包括耦合在现场总线接口电路和发射机接口电路之间的转换电路。 发射器包括用于感测过程变量并提供换能器输出的换能器。 测量电路耦合到传感器输出,处理传感器输出并提供测量输出。 发射机接口电路耦合到测量电路,并提供表示测量输出的接口输出。 此外,发射机接口电路接收发射机命令并根据发射机命令进行响应。 现场总线接口电路适于耦合到根据现场总线标准进行操作的过程控制回路。
    • 7. 发明授权
    • Transmitter with improved compensation
    • 变送器具有改进的补偿
    • US5960375A
    • 1999-09-28
    • US866290
    • 1997-05-30
    • Jogesh WarriorScott E. BrighamGary A. Lenz
    • Jogesh WarriorScott E. BrighamGary A. Lenz
    • G01D3/028G01D3/02G01D3/036G01D18/00G01D5/00
    • G01D3/0365G01D18/00G01D3/022Y10S706/90Y10S706/906
    • A circuit for compensating variables in a measurement transmitter. Within the transmitter, a sensor senses a primary process variable such as differential pressure and a converter digitizes the sensed process variable. The sensor senses pressures within a span of pressures values. A memory inside the transmitter stores at least two membership functions, each membership function having a non-zero value over a predetermined region of the process variable span and a substantially zero value over the remainder of the span. The memory also stores a set of compensation formulas, each formula corresponding to a membership function. A selection circuit in the transmitter selects those membership functions which have a non-zero value at the digitized process variable and a correction circuit provides at least one correction value, each correction value calculated from a compensation formula corresponding to a selected membership function. A weighting circuit multiplies each correction value by its corresponding selected membership function, and combines the multiplicands to provide a compensated process variable. The compensated process variable is coupled to a control circuit connecting the transmitter to a control system.
    • 用于补偿测量变送器中变量的电路。 在变送器内,传感器感测主要过程变量,例如差压,转换器对感测到的过程变量进行数字化。 传感器感测压力范围内的压力值。 发射机内的存储器存储至少两个隶属函数,每个隶属函数在过程可变跨度的预定区域上具有非零值,并且在跨度的剩余部分上具有基本为零的值。 存储器还存储一组补偿公式,每个公式对应于隶属函数。 发射机中的选择电路选择在数字化处理变量处具有非零值的那些隶属函数,并且校正电路提供至少一个校正值,每个校正值根据与选定的隶属函数对应的补偿公式计算。 加权电路将每个校正值乘以其对应的选择的隶属函数,并且组合被乘数以提供经补偿的过程变量。 补偿过程变量耦合到将发射器连接到控制系统的控制电路。
    • 8. 发明授权
    • Transmitter with improved compensation
    • 变送器具有改进的补偿
    • US5642301A
    • 1997-06-24
    • US186288
    • 1994-01-25
    • Jogesh WarriorScott E. BrighamGary A. Lenz
    • Jogesh WarriorScott E. BrighamGary A. Lenz
    • G01D3/028G01D3/02G01D3/036G01D18/00G01F1/08
    • G01D3/0365G01D18/00G01D3/022Y10S706/90Y10S706/906
    • A circuit for compensating variables in a measurement transmitter. Within the transmitter, a sensor senses a primary process variable such as differential pressure and a converter digitizes the sensed process variable. The sensor senses pressures within a span of pressures values. A memory inside the transmitter stores at least two membership functions, each membership function having a non-zero value over a predetermined region of the process variable span and a substantially zero value over the remainder of the span. The memory also stores a set of compensation formulas, each formula corresponding to a membership function. A selection circuit in the transmitter selects those membership functions which have a non-zero value at the digitized process variable and a correction circuit provides at least one correction value, each correction value calculated from a compensation formula corresponding to a selected membership function. A weighting circuit multiplies each correction value by its corresponding selected membership function, and combines the multiplicands to provide a compensated process variable. The compensated process variable is coupled to a control circuit connecting the transmitter to a control system.
    • 用于补偿测量变送器中变量的电路。 在变送器内,传感器感测主要过程变量,例如差压,转换器对感测到的过程变量进行数字化。 传感器感测压力范围内的压力值。 发射机内的存储器存储至少两个隶属函数,每个隶属函数在过程可变跨度的预定区域上具有非零值,并且在跨度的剩余部分上具有基本为零的值。 存储器还存储一组补偿公式,每个公式对应于隶属函数。 发射机中的选择电路选择在数字化处理变量处具有非零值的那些隶属函数,并且校正电路提供至少一个校正值,每个校正值根据与选定的隶属函数对应的补偿公式计算。 加权电路将每个校正值乘以其对应的选择的隶属函数,并且组合被乘数以提供经补偿的过程变量。 补偿过程变量耦合到将发射器连接到控制系统的控制电路。
    • 9. 发明授权
    • Valve positioner with pressure feedback, dynamic correction and
diagnostics
    • US5549137A
    • 1996-08-27
    • US112694
    • 1993-08-25
    • Gary A. LenzGregory C. BrownJogesh Warrior
    • Gary A. LenzGregory C. BrownJogesh Warrior
    • G05D3/12G05D7/00G05D7/06G05D16/20F16K31/126
    • G05D7/005F16K31/1262F16K37/0083Y10T137/2452Y10T137/7759Y10T137/7761
    • In this invention, a valve positioner receives a setpoint from a master and provides a control pressure to a valve actuator for controlling a valve. A sensing circuit in the positioner senses the position of the valve and the control pressure, and a control circuit in the positioner uses both the sensed pressure and position to provide a command output to a pneumatic section which produces the control pressure. In another embodiment of the invention, a positioner receives a setpoint from a master and provides a control pressure to a valve actuator for controlling a valve. A sensing circuit in the positioner senses the valve position and pneumatics in the positioner provide the control pressure as a function of the sensed position and an output from a control circuit within the positioner. The positioner includes a diagnostic circuit which stores a valve attribute and provides a diagnostic output as a function of the stored valve characteristic and a selected one of the sensed variables. In another embodiment of the invention, a positioner includes a correction circuit for storing a valve attribute affected by one of a set of physical parameters and for receiving a selected one of the set of sensed physical parameters. The correction means compensates a command output from a control circuit as a function of the sensed physical parameter and the stored valve characteristic. In another embodiment, the positioner includes a benchset control circuit which ramps the control pressure between an initial control pressure and a final control pressure and back to the initial control pressure, while sampling specific control pressures and their corresponding positions, in order to provide an output indicating the proper spring preload force on an actuator spring.
    • 10. 发明授权
    • Dual master implied token communication system
    • 双主令隐含令牌通信系统
    • US4988990A
    • 1991-01-29
    • US456047
    • 1989-12-26
    • Jogesh Warrior
    • Jogesh Warrior
    • G08C19/02H04L12/403
    • H04L12/403G08C19/02
    • A pair of master units share a common communication link to communicate with one or more slave units. Each slave unit transmits a message only in response to a message from one of the master units. When an initial transmission request is received by a master unit, it monitors the communication link and only initiates transmission of a message when the link has been quiet for a link quiet time period. After completing a transmission of a message, the master unit waits a link grant time period before transmitting again to permit the other master unit an opportunity to transmit a message if it desires. Synchronization of the two master units, therefore, is achieved quickly and with minimum overhead.
    • 一对主单元共享公共通信链路以与一个或多个从单元通信。 每个从单元仅响应于来自主单元之一的消息来发送消息。 当主单元接收到初始传输请求时,它监视通信链路,并且只有当链路在链路静默时间段内安静时才启动消息的传输。 在完成消息的传输之后,主单元在再次发送之前等待链路授权时间段,以允许另一个主单元有机会在其需要时发送消息。 因此,可以快速实现两个主单元的同步,并以最小的开销。