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1. 发明授权

US5963147A Conversion circuit for process control system 失效
标题翻译：过程控制系统转换电路
公开(公告)号：US5963147A
公开(公告)日：1999-10-05
申请号：US897523
申请日：1997-07-21
申请人： Brian L. Westfield , Stephen D. Anderson , Bennett L. Louwagie , Todd A. Piechowski , Gregory C. Brown
发明人： Brian L. Westfield , Stephen D. Anderson , Bennett L. Louwagie , Todd A. Piechowski , Gregory C. Brown
IPC分类号： G05B11/36 , G05B19/042 , G05B19/418 , H04L25/02 , G08C19/04
CPC分类号： G05B19/0423 , G05B19/4185 , G05B2219/25189 , G05B2219/25191 , G05B2219/31121 , G05B2219/31126 , G05B2219/31135 , G05B2219/33197 , Y02P90/18
摘要： Conversion circuitry for use in a process control system is adapted for coupling to a primary process control loop. Digital receiver circuitry in the conversion circuitry receives a digital signal transmitted over the primary process control loop from a field transmitter and responsively provides a digital output. A microprocessor receives the digital output and responsively provides a secondary loop control output. Secondary loop control circuitry for coupling to a secondary process control loop receives the secondary loop control output from the microprocessor and responsively controls current flowing through the secondary process control loop. The current flowing through the secondary process control loop is related to the digital signal transmitted by the field transmitter.
摘要翻译：用于过程控制系统的转换电路适于耦合到主过程控制回路。转换电路中的数字接收机电路接收从现场发射机通过主过程控制回路传输的数字信号，并且响应地提供数字输出。微处理器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的二次回路控制电路接收来自微处理器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的电流。流过次级过程控制回路的电流与现场发射机发射的数字信号有关。

2. 发明授权

US06307483B1 Conversion circuit for process control system 失效
标题翻译：过程控制系统转换电路
公开(公告)号：US06307483B1
公开(公告)日：2001-10-23
申请号：US09287775
申请日：1999-04-07
申请人： Brian L. Westfield , Stephen D. Anderson , Bennett L. Louwagie , Todd A. Piechowski , Gregory C. Brown
发明人： Brian L. Westfield , Stephen D. Anderson , Bennett L. Louwagie , Todd A. Piechowski , Gregory C. Brown
IPC分类号： G08C1904
CPC分类号： G05B19/0423 , G05B19/4185 , G05B2219/25189 , G05B2219/25191 , G05B2219/31121 , G05B2219/31126 , G05B2219/31135 , G05B2219/33197 , Y02P90/18
摘要： Conversion circuitry for use in a process control system is adapted for coupling to a primary process control loop. Digital receiver circuitry in the conversion circuitry receives a digital signal transmitted over the primary process control loop from a field transmitter and responsively provides a digital output. A microprocessor receives the digital output and responsively provides a secondary loop control output. Secondary loop control circuitry for coupling to a secondary process control loop receives the secondary loop control output from the microprocessor and responsively controls current flowing through the secondary process control loop. The current flowing through the secondary process control loop is related to the digital signal transmitted by the field transmitter.
摘要翻译：用于过程控制系统的转换电路适于耦合到主过程控制回路。转换电路中的数字接收机电路接收从现场发射机通过主过程控制回路传输的数字信号，并且响应地提供数字输出。微处理器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的二次回路控制电路接收来自微处理器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的电流。流过次级过程控制回路的电流与现场发射机发射的数字信号有关。

3. 发明授权

US5650777A Conversion circuit for process control system 失效
标题翻译：过程控制系统转换电路
公开(公告)号：US5650777A
公开(公告)日：1997-07-22
申请号：US479801
申请日：1995-06-07
申请人： Brian L. Westfield , Stephen D. Anderson , Bennett L. Louwagie , Todd A. Piechowski
发明人： Brian L. Westfield , Stephen D. Anderson , Bennett L. Louwagie , Todd A. Piechowski
IPC分类号： G05B11/36 , G05B19/042 , G05B19/418 , H04L25/02 , G08C19/36
CPC分类号： G05B19/0423 , G05B19/4185 , G05B2219/25189 , G05B2219/25191 , G05B2219/31121 , G05B2219/31126 , G05B2219/31135 , G05B2219/33197 , Y02P90/18
摘要： Conversion circuitry for use in a process control system is adapted for coupling to a primary process control loop. Digital receiver circuitry in the conversion circuitry receives a digital signal transmitted over the primary process control loop from a field transmitter and responsively provides a digital output. A microprocessor receives the digital output and responsively provides a secondary loop control output. Secondary loop control circuitry for coupling to a secondary process control loop receives the secondary loop control output from the microprocessor and responsively controls current flowing through the secondary process control loop. The current flowing through the secondary process control loop is related to the digital signal transmitted by the field transmitter.
摘要翻译：用于过程控制系统的转换电路适于耦合到主过程控制回路。转换电路中的数字接收机电路接收从现场发射机通过主过程控制回路传输的数字信号，并且响应地提供数字输出。微处理器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的二次回路控制电路接收来自微处理器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的电流。流过次级过程控制回路的电流与现场发射机发射的数字信号有关。

4. 发明授权

US5245333A Three wire low power transmitter 失效
标题翻译：三线低功率发射机
公开(公告)号：US5245333A
公开(公告)日：1993-09-14
申请号：US766667
申请日：1991-09-25
申请人： Stephen D. Anderson , Roger L. Frick , Glen E. Monzo , Brian L. Westfield
发明人： Stephen D. Anderson , Roger L. Frick , Glen E. Monzo , Brian L. Westfield
IPC分类号： G08C19/02
CPC分类号： G08C19/02
摘要： A three wire transmitter bidirectionally communicates AC signals to and from a first external device and sends DC signals to a second external device. The transmitter includes a communication circuit which is energized from power and common terminals and includes memory storage for transmitter status and a process variable (PV). The communication circuit receives a sensor output indicative of the PV and provides the DC signal and the AC signal to a signal terminal which connects to both external devices, and also receives AC signals from the first external device. The communications circuit has a characteristic AC impedance between the signal and common terminals over an AC frequency range for receiving and transmitting AC signals to and from the first external device so that the receiving signals are not shorted out and so the transmitted signals can be received. The communications circuit has a characteristic DC impedance between the signal and common terminals over a range of frequencies which include DC and typically extend to approximately 20 Hz. The characteristic impedance is substantially lower than the impedance of the second external device which receives DC signals so that the accuracy of the DC signal is not compromised.
摘要翻译：三线制发射机将交流信号双向地传送到第一外部设备并从第一外部设备传送直流信号到第二外部设备。发射机包括一个从电源和公共终端通电的通信电路，包括用于发射机状态的存储器和一个过程变量（PV）。通信电路接收表示PV的传感器输出，并将DC信号和AC信号提供给连接到两个外部设备的信号端子，并且还从第一外部设备接收AC信号。该通信电路具有在交流频率范围内的信号与公共端之间的特征交流阻抗，用于从第一外部装置接收和发送交流信号，使得接收信号不被短路，因此可以接收所发送的信号。通信电路在包括DC并且通常延伸到大约20Hz的频率范围内在信号和公共端子之间具有特征的DC阻抗。特征阻抗基本上低于接收DC信号的第二外部设备的阻抗，使得DC信号的精度不受影响。

5. 发明授权

US09182256B2 Process variable transmitter with two-wire process control loop diagnostics 有权
标题翻译：具有二线过程控制回路诊断功能的过程变量变送器
公开(公告)号：US09182256B2
公开(公告)日：2015-11-10
申请号：US12832341
申请日：2010-07-08
申请人： David L. Wehrs , Gregory J. LeCuyer , Jessica Lo , Steven J. McCoy , Brian L. Westfield
发明人： David L. Wehrs , Gregory J. LeCuyer , Jessica Lo , Steven J. McCoy , Brian L. Westfield
IPC分类号： G01R11/17 , G01R11/16 , G06F3/00 , G06F3/01 , G01D21/00 , G05B19/042
CPC分类号： G01D21/00 , G05B19/0423 , G05B2219/24069
摘要： A two-wire process variable transmitter for use in an industrial process, including a process variable sensor configured to sense a process variable of a fluid of the industrial process. Output circuitry is configured to provide an output on a two-wire process control loop which is related to the sensed process variable. Loop current measurement circuitry measures a loop current flowing through the two-wire process control loop and terminal voltage measurement circuitry measures a voltage related to a terminal voltage of the process variable transmitter. The terminal voltage can be a voltage measured across an electrical connection of the two-wire process variable transmitter to the two-wire process control loop. Input circuitry is configured to receive a diagnostic command from the two-wire process control loop. A microprocessor configured to perform loop diagnostics on the two-wire process control loop based upon the measured loop current and terminal voltage in response to receipt of a diagnostic command from the two-wire process control loop.
摘要翻译：一种用于工业过程的二线过程变量变送器，包括被配置为感测工业过程流体的过程变量的过程变量传感器。输出电路被配置为在与所感测的过程变量相关的二线过程控制回路上提供输出。回路电流测量电路测量流过两线制过程控制回路的回路电流，并且端子电压测量电路测量与过程变量变送器的端子电压相关的电压。端子电压可以是两线制过程变量发射机与两线制过程控制回路的电气连接测量的电压。输入电路配置为从两线制过程控制回路接收诊断命令。该微处理器被配置为响应于从两线制过程控制回路接收到诊断命令，基于所测量的回路电流和端子电压在两线制过程控制回路上执行循环诊断。

6. 发明授权

US08049361B2 RF adapter for field device with loop current bypass 有权
标题翻译：射频适配器，用于带环路电流旁路的现场设备
公开(公告)号：US08049361B2
公开(公告)日：2011-11-01
申请号：US12486253
申请日：2009-06-17
申请人： John A. Kielb , Brian L. Westfield
发明人： John A. Kielb , Brian L. Westfield
IPC分类号： H02J3/00
CPC分类号： H04L12/40045 , G05B19/0423 , G05B2219/25191 , G05B2219/25196 , H04L12/40176 , H04L2012/4026 , Y10T307/445
摘要： A wireless adapter for use with a two-wire process control loop is configured to couple to a process field device in an industrial process control system. The wireless adapter is coupled to the two-wire process control loop and provides wireless communication to the process field device. The adapter includes first and second loop terminals configured to couple in series with the two-wire process control loop. Wireless communication circuitry is coupled to the first and second loop terminals and is adapted to provide wireless communication to the process field device. Loop current bypass circuitry is electrically connected between the first and second loop terminals and is configured to provide a loop current path therebetween in response to an open circuit in wireless communication circuitry.
摘要翻译：用于两线过程控制回路的无线适配器被配置为耦合到工业过程控制系统中的过程现场设备。无线适配器耦合到两线制过程控制回路，并向过程现场设备提供无线通信。适配器包括被配置为与两线制过程控制回路串联耦合的第一和第二回路端子。无线通信电路耦合到第一和第二环路终端，并且适于向该过程现场设备提供无线通信。环路电流旁路电路电连接在第一和第二环路端子之间，并且被配置为响应于无线通信电路中的开路而在其间提供环路电流路径。

7. 发明授权

US08787848B2 RF adapter for field device with low voltage intrinsic safety clamping 有权
标题翻译：射频适配器，用于现场设备，具有低电压本质安全钳位
公开(公告)号：US08787848B2
公开(公告)日：2014-07-22
申请号：US12486269
申请日：2009-06-17
申请人： John A. Kielb , Brian L. Westfield , Kelly M. Orth
发明人： John A. Kielb , Brian L. Westfield , Kelly M. Orth
IPC分类号： H01Q11/12 , H04B1/04
CPC分类号： G05B19/4185 , G01D21/00 , G05B2219/31121 , G05B2219/33192 , G05B2219/34313 , G08C17/02 , Y02P80/114 , Y02P90/18 , Y02P90/86
摘要： An adapter for coupling to a process control transmitter of the type used to monitor a process variable in an industrial process includes a first connection configured to couple to a first side of a two wire process control loop, a second connection configured to couple to a second side of the two wire process control loop and in series with a first connection to a process control transmitter, and a third connection configured to couple to a second connection of the process control transmitter. Wireless communication circuitry is coupled to at least the third connection and is configured to provide wireless communication for the process control transmitter. Intrinsic safety circuitry coupled to at least one of the first, second and third connections is configured to limit transfer of electrical energy to a value which is less than an intrinsic safety value.
摘要翻译：用于耦合到用于监测工业过程中的过程变量的类型的过程控制变送器的适配器包括被配置为耦合到双线过程控制回路的第一侧的第一连接，被配置为耦合到第二连接的第二连接并且与第一连接到过程控制发送器串联，以及第三连接，其被配置为耦合到过程控制发送器的第二连接。无线通信电路耦合到至少第三连接，并且被配置为为过程控制发送器提供无线通信。耦合到第一，第二和第三连接中的至少一个的本质安全电路被配置为将电能的转移限制到小于本征安全值的值。

8. 发明授权

US08694060B2 Form factor and electromagnetic interference protection for process device wireless adapters 有权
标题翻译：过程设备无线适配器的外形和电磁干扰保护
公开(公告)号：US08694060B2
公开(公告)日：2014-04-08
申请号：US12485189
申请日：2009-06-16
申请人： Joel D. Vanderaa , Christina A. Grunig , Ronald F. Hurd , Brian L. Westfield , Chad M. McGuire , Steven B. Paullus
发明人： Joel D. Vanderaa , Christina A. Grunig , Ronald F. Hurd , Brian L. Westfield , Chad M. McGuire , Steven B. Paullus
IPC分类号： H04M1/00 , H01Q1/24 , H04B1/16
CPC分类号： G08C17/04
摘要： A process device wireless adapter includes a wireless communications module, a metallic housing, and an antenna. The wireless communications module is configured to communicatively couple to a process device and to a wireless receiver. The metallic housing surrounds the wireless communication module and has a first end and a second end. The first end is configured to attach to the process device. In one embodiment, a metallic shield contacts the housing second end such that the metallic shield and the housing form a substantially continuous conductive surface. The antenna is communicatively coupled to the wireless communication module and separated from the wireless communication module by the metallic shield. Preferably, the wireless communications module illustratively includes a printed circuit board that has a length that is greater than its width.
摘要翻译：处理设备无线适配器包括无线通信模块，金属外壳和天线。无线通信模块被配置为通信地耦合到处理设备和无线接收器。金属外壳包围无线通信模块，并具有第一端和第二端。第一端被配置为附加到处理设备。在一个实施例中，金属屏蔽件接触壳体的第二端，使得金属屏蔽和壳体形成基本上连续的导电表面。天线通信地耦合到无线通信模块，并通过金属屏蔽与无线通信模块分离。优选地，无线通信模块示例性地包括具有大于其宽度的长度的印刷电路板。

9. 发明授权

US07956738B2 Process field device with radio frequency communication 有权
标题翻译：具有射频通信的过程现场设备
公开(公告)号：US07956738B2
公开(公告)日：2011-06-07
申请号：US11842356
申请日：2007-08-21
申请人： Robert J. Karschnia , Charles R. Willcox , David A. Broden , Brian L. Westfield , Kelly M. Orth
发明人： Robert J. Karschnia , Charles R. Willcox , David A. Broden , Brian L. Westfield , Kelly M. Orth
IPC分类号： H04Q11/04 , G08B29/00 , G08B1/08
CPC分类号： G05B19/4185 , G05B2219/33192 , Y02P90/18 , Y02P90/86
摘要： A field device for use in an industrial process control or monitoring system includes terminals configured to connect to a two-wire process control loop. The loop carries data and provides power to the field device. RF circuitry in the field device is provided for radio frequency communication. A power supply powers the RF circuitry using power received from the two-wire process control loop.
摘要翻译：用于工业过程控制或监测系统的现场设备包括被配置为连接到二线过程控制回路的终端。环路承载数据，并向现场设备提供电源。提供现场设备中的RF电路用于射频通信。电源使用从两线制过程控制回路接收的功率为射频电路供电。

10. 发明授权

US06765968B1 Process transmitter with local databus 有权
标题翻译：使用本地数据总线处理变送器
公开(公告)号：US06765968B1
公开(公告)日：2004-07-20
申请号：US09672338
申请日：2000-09-28
申请人： Richard L. Nelson , Weston R. Roper , Brian L. Westfield
发明人： Richard L. Nelson , Weston R. Roper , Brian L. Westfield
IPC分类号： H04B300
CPC分类号： G01D11/24 , G01D1/00
摘要： An industrial process control system includes a remote transmitter that measures a process variable to transmit data over a process control loop. A local databus interface includes an active current source and is configured to transmit and/or receive data on a local databus. The local databus includes a signaling wire operated to a high signal level during idle communications and modulated between the high and a low signal level during data communication. The active current source is coupled to the signaling wire of the databus to limit current drawn by the signaling wire during a low signal level.
摘要翻译：工业过程控制系统包括测量通过过程控制回路传输数据的过程变量的远程变送器。本地数据总线接口包括有源电流源，并配置为在本地数据总线上传输和/或接收数据。本地数据总线包括在空闲通信期间操作为高信号电平的信号线，并且在数据通信期间在高信号电平和低信号电平之间进行调制。有源电流源耦合到数据总线的信令线，以限制信号线在低信号电平期间汲取的电流。

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