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    CONVERSION CIRCUIT FOR PROCESS CONTROL SYSTEM
    1.
    发明申请
    CONVERSION CIRCUIT FOR PROCESS CONTROL SYSTEM 审中-公开
    过程控制系统转换电路

    公开(公告)号：WO1996041243A1

    公开(公告)日：1996-12-19

    申请号：PCT/US1996008128

    申请日：1996-05-31

    Applicant: ROSEMOUNT INC.

    Inventor： ROSEMOUNT INC. ,  WESTFIELD, Brian, L. ,  ANDERSON, Stephen, D. ,  LOUWAGIE, Bennett, L. ,  PIECHOWSKI, Todd, A.

    IPC: G05B19/042

    CPC classification number: G05B19/0423 ,  G05B19/4185 ,  G05B2219/25189 ,  G05B2219/25191 ,  G05B2219/31121 ,  G05B2219/31126 ,  G05B2219/31135 ,  G05B2219/33197 ,  Y02P90/18

    Abstract: Conversion circuitry (40) for use in a process control system (10) is adapted for coupling to a primary process control loop (26). Digital receiver circuitry (46, 52) in the conversion circuitry (40) receives a digital signal transmitted over the primary process control loop (26) from a field transmitter (22) and responsively provides a digital output. A microprocessor (50) receives the digital output and responsively provides a secondary loop control output. Secondary loop control circuitry (62) for coupling to a secondary process control loop (58) receives the secondary loop control output from the microprocessor (50) and responsively controls current flowing through the secondary process control loop (58). The current flowing through the secondary process control loop (58) is related to the digital signal transmitted by the field transmitter (22).

    Abstract translation: 用于过程控制系统（10）的转换电路（40）适于耦合到主过程控制回路（26）。 转换电路（40）中的数字接收器电路（46,52）从现场发射器（22）接收通过主要过程控制回路（26）发送的数字信号，并且响应地提供数字输出。 微处理器（50）接收数字输出并且响应地提供辅助回路控制输出。 用于耦合到次级过程控制回路（58）的二次回路控制电路（62）接收来自微处理器（50）的次级回路控制输出，并且响应地控制流过次级过程控制回路（58）的电流。 流过二级过程控制回路（58）的电流与由现场发射机（22）发送的数字信号有关。

    POWER SUPPLY FOR FIELD MOUNTED TRANSMITTER
    5.
    发明公开
    POWER SUPPLY FOR FIELD MOUNTED TRANSMITTER 失效
    稳压电源在工作环境中SET SENDER

    公开(公告)号：EP0770231A2

    公开(公告)日：1997-05-02

    申请号：EP95926606.0

    申请日：1995-06-28

    Applicant: ROSEMOUNT INC.

    Inventor： VOEGELE, Kevin, D. ,  PIECHOWSKI, Todd, A.

    IPC: G08C19 ,  G05B15

    CPC classification number: G05B15/02

    Abstract: A field mounted transmitter (10) for use in a two-wire process control loop (16a/16b) includes a sensor (12), measurement circuitry (18) and a power supply (20). The sensor (12) senses a process variable of a process which is transmitted over the control loop (16a/16b) by the measurement circuitry (18). The power supply (20) is powered by a current flowing through the control loop (16a/16b) and powers the measurement circuitry (18). The power supply (20) includes an inductive element (70) coupled to the measurement circuitry (18) and a switch (64) which selectively couples the inductive element (70) to the control loop (16a/16b).

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