PROCESS TRANSMITTER COMMUNICATIONS CIRCUIT
    1.
    发明申请
    PROCESS TRANSMITTER COMMUNICATIONS CIRCUIT 审中-公开
    过程发送器通信电路

    公开(公告)号:WO1998014854A1

    公开(公告)日:1998-04-09

    申请号:PCT/US1997017611

    申请日:1997-09-30

    Applicant: ROSEMOUNT INC.

    CPC classification number: G05B19/4185 Y02P90/18

    Abstract: A process transmitter communications circuit (20, 96) has link terminals (40) which are coupled to a process link (12), which supplies power to the circuit. A power source (38) is coupled to one of the link terminals and is independent from the power supplied from the process link (12). Communications circuitry (42) is coupled to the power source (38) and link terminals (40), which transmits a transmitter signal over the process link (12), through the link terminals (40). A power sensing component (44) is coupled to at least one of the link terminals (40) and the communications circuitry (42) and senses whether the power supplied by the process link (12) is inadequate to transmit the transmitter signal. A power control component (46) is coupled to the power source (38), the link terminals (40) and the communications circuitry (42) and selectively applies power from the power source (38) to the communications circuitry (42) for transmitting the transmitter signal when the power sensing component (44) senses there is inadequate power supplied by the process link (12).

    Abstract translation: 过程变送器通信电路(20,96)具有连接端子(40),该连接端子(40)耦合到处理链路(12),该处理链路为电路供电。 电源(38)耦合到一个链路终端,并且独立于从处理链路(12)提供的电力。 通信电路(42)耦合到通过链路终端(40)通过过程链路(12)发送发射机信号的电源(38)和链路终端(40)。 功率感测组件(44)耦合到链路终端(40)和通信电路(42)中的至少一个,并且感测由过程链路(12)提供的功率是否不足以发送发射机信号。 功率控制部件(46)耦合到电源(38),链路端子(40)和通信电路(42),并且选择性地将来自电源(38)的功率施加到通信电路(42)以用于发射 当功率感测组件(44)感测到由处理链路(12)提供的功率不足时,发射机信号。

    DIGITAL CONVERTER APPARATUS FOR IMPROVING THE OUTPUT OF A TWO-WIRE TRANSMITTER
    2.
    发明申请
    DIGITAL CONVERTER APPARATUS FOR IMPROVING THE OUTPUT OF A TWO-WIRE TRANSMITTER 审中-公开
    用于改善双线发射器输出的数字转换器

    公开(公告)号:WO1988002528A1

    公开(公告)日:1988-04-07

    申请号:PCT/US1987002448

    申请日:1987-09-24

    Applicant: ROSEMOUNT INC.

    CPC classification number: G08C19/02

    Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.

    Abstract translation: 现有的模拟双线发射器(11)具有传感器模块(35)和模拟电路(23),其向二线电流回路(14)提供表示感测的过程变量(例如压力)的输出。 模拟电路(23)的至少部分被去除,并被包括数字转换器(52)的设备替代,数字转换器(52)使用电流回路(14)中相同的电流范围数字地计算发射机输出,并且计算校正以获得输出的线性 。

    DIGITAL CONVERTER APPARATUS FOR IMPROVING THE OUTPUT OF A TWO-WIRE TRANSMITTER
    3.
    发明授权
    DIGITAL CONVERTER APPARATUS FOR IMPROVING THE OUTPUT OF A TWO-WIRE TRANSMITTER 失效
    数字转换器装置用于提高两线制变送器的输出。

    公开(公告)号:EP0324784B1

    公开(公告)日:1994-07-27

    申请号:EP87906717.1

    申请日:1987-09-24

    Applicant: ROSEMOUNT INC.

    CPC classification number: G08C19/02

    Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.

    DIGITAL CONVERTER APPARATUS FOR IMPROVING THE OUTPUT OF A TWO-WIRE TRANSMITTER
    4.
    发明公开
    DIGITAL CONVERTER APPARATUS FOR IMPROVING THE OUTPUT OF A TWO-WIRE TRANSMITTER 失效
    数字转换器装置用于提高两线制变送器的输出。

    公开(公告)号:EP0324784A1

    公开(公告)日:1989-07-26

    申请号:EP87906717.0

    申请日:1987-09-24

    Applicant: ROSEMOUNT INC.

    CPC classification number: G08C19/02

    Abstract: Un émetteur analogique à deux fils existant (11) possède un module capteur (35) et des circuits analogiques (23) qui envoient des signaux de sortie représentant une variable d'un processus capté, telle qu'une pression, à une boucle de courant à deux fils (14). Quelques parties au moins du circuit analogique (23) sont démontées et replacées par un dispositif comprenant un convertisseur numérique (52) qui calcule de manière numérique les signaux de sortie de l'émetteur en utilisant la même plage de courant dans la boucle de courant (14) et qui détermine les corrections permettant d'obtenir des signaux de sortie linéaires.

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