公开(公告)号：US20130325381A1

公开(公告)日：2013-12-05

申请号：US13816333

申请日：2012-05-29

申请人： Valentin G. Varnak ,  Pavel P. Schmidt ,  Leonid I. Belov

发明人： Valentin G. Varnak ,  Pavel P. Schmidt ,  Leonid I. Belov

IPC分类号： G01R19/00

CPC分类号： G01R19/0092 ,  G01R19/2509 ,  G01R31/2829 ,  G05B19/0425 ,  G05B23/0235 ,  G05B2219/25428 ,  G05B2219/33197 ,  G05B2219/33331 ,  G08C19/02 ,  H04Q9/00 ,  H04Q2209/823

摘要： Some embodiments are directed to a process device comprising a process variable sensor configured to generate an output signal indicative of a sensed process variable; loop current output circuitry configured to control a loop current on a two wire process control loop to a value based on the output signal; loop current measurement circuitry coupled to the process control loop and configured to generate a measured loop current value based on the loop current; and loop current verification circuitry configured to approximate the loop current value based on the output signal and properties of a low pass filter, and generate a diagnostic signal based on a comparison of the approximated loop current value and the measured loop current value.

摘要翻译： 一些实施例涉及包括被配置为生成指示感测的过程变量的输出信号的过程变量传感器的过程设备; 环路电流输出电路被配置为基于输出信号将两线制过程控制回路上的回路电流控制到一个值; 环路电流测量电路耦合到过程控制回路并且被配置为基于回路电流产生测量的回路电流值; 以及环路电流验证电路，其被配置为基于低通滤波器的输出信号和特性来近似环路电流值，并且基于近似环路电流值与测量的环路电流值的比较来生成诊断信号。

公开(公告)号：US09823276B2

公开(公告)日：2017-11-21

申请号：US13816333

申请日：2012-05-29

申请人： Valentin G. Varnak ,  Pavel P. Schmidt ,  Leonid I. Belov

发明人： Valentin G. Varnak ,  Pavel P. Schmidt ,  Leonid I. Belov

IPC分类号： G01R19/00 ,  G05B23/02 ,  G08C19/02 ,  H04Q9/00 ,  G01R19/25 ,  G01R31/28 ,  G05B19/042

CPC分类号： G01R19/0092 ,  G01R19/2509 ,  G01R31/2829 ,  G05B19/0425 ,  G05B23/0235 ,  G05B2219/25428 ,  G05B2219/33197 ,  G05B2219/33331 ,  G08C19/02 ,  H04Q9/00 ,  H04Q2209/823

摘要： Some embodiments are directed to a process device comprising a process variable sensor configured to generate an output signal indicative of a sensed process variable; loop current output circuitry configured to control a loop current on a two wire process control loop to a value based on the output signal; loop current measurement circuitry coupled to the process control loop and configured to generate a measured loop current value based on the loop current; and loop current verification circuitry configured to approximate the loop current value based on the output signal and properties of a low pass filter, and generate a diagnostic signal based on a comparison of the approximated loop current value and the measured loop current value.