公开(公告)号：US06480131B1

公开(公告)日：2002-11-12

申请号：US09636152

申请日：2000-08-10

申请人： Weston R. Roper ,  David G. Tyson ,  Brian L. Westfield ,  Michael J. Gaboury

发明人： Weston R. Roper ,  David G. Tyson ,  Brian L. Westfield ,  Michael J. Gaboury

IPC分类号： H03M112

CPC分类号： G05B19/4142 ,  G05B19/0423 ,  G05B2219/31121 ,  G05B2219/31126 ,  G05B2219/33197 ,  G05B2219/34309

摘要： A two-wire industrial process control transmitter includes a sensor, at least two integrated circuits, and a level shift circuit. The first integrated circuit contains the analog measurement circuit that includes a sensor detection circuit and the analog portion of a digital-to-analog convertor. The second integrated circuit contains the digital system circuit that includes a modem and the digital portion of the analog-to-digital convertor. The first and second ICs may be powered at different voltage levels to maximize the power of the analog circuit and improve resolution. Alternatively, the ICs may be powered at the same voltage level, but the digital circuits are divided among several stacked dies to minimize the voltage for each digital circuit. In either case, the level shifting circuit shifts the voltage level between the analog and digital circuits.

摘要翻译： 双线工业过程控制发射机包括传感器，至少两个集成电路和电平移位电路。 第一集成电路包含模拟测量电路，其包括传感器检测电路和数模转换器的模拟部分。 第二集成电路包含数字系统电路，其包括调制解调器和模拟 - 数字转换器的数字部分。 第一和第二IC可以以不同的电压电平供电，以最大化模拟电路的功率并提高分辨率。 或者，IC可以以相同的电压电平供电，但是数字电路在几个堆叠的管芯之间分开，以使每个数字电路的电压最小化。 在任一情况下，电平移位电路使模拟和数字电路之间的电压电平移位。

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。

公开(公告)号：US06859755B2

公开(公告)日：2005-02-22

申请号：US09855179

申请日：2001-05-14

申请人： Evren Eryurek ,  Dale W. Borgeson ,  Marcos Peluso ,  Gregory H. Rome ,  Weston R. Roper

发明人： Evren Eryurek ,  Dale W. Borgeson ,  Marcos Peluso ,  Gregory H. Rome ,  Weston R. Roper

IPC分类号： G05B23/02 ,  G06F11/30

CPC分类号： H04L12/40006 ,  G05B23/0213 ,  G05B2219/31129 ,  H04L43/18 ,  H04L2012/4026

摘要： A field device includes diagnostic circuitry adapted to measure a characteristic related to a process control and measurement system. The measured characteristic is used to provide a diagnostic output indicative of a condition of the process control and measurement system. The measured characteristic can be provided to a diagnostic module that operates upon the measured characteristic to predict, or otherwise model, a condition of the process control and measurement system.

摘要翻译： 现场设备包括适于测量与过程控制和测量系统相关的特性的诊断电路。 测量的特性用于提供指示过程控制和测量系统的状况的诊断输出。 测量特性可以提供给诊断模块，该诊断模块根据所测量的特性来预测或模拟过程控制和测量系统的状况。