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Field device for determining or monitoring process variable in automation technology

A technology for monitoring automation and on-site devices, which is applied in general control systems, control/regulation systems, instruments, etc., and can solve problems such as inability to obtain safety levels

Active Publication Date: 2015-04-08
EHNDRESS KHAUZER GMBKH KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This level of security cannot be achieved with conventional microprocessors

Method used

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  • Field device for determining or monitoring process variable in automation technology
  • Field device for determining or monitoring process variable in automation technology
  • Field device for determining or monitoring process variable in automation technology

Examples

Experimental program
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Embodiment Construction

[0026] figure 1 A block diagram of a preferred embodiment of a control / evaluation unit 12 that can be used in connection with the field device of the invention is shown. The control / evaluation unit 12 features a double redundant voter 13 . To this end, at least some of the components of the voter are double redundant.

[0027] figure 1 The illustrated voter 13 is implemented as a majority voter and includes three components or stages:

[0028] - a comparator stage 4 which compares the output signals 1 , 2 , 3 delivered by the individual measurement channels MK1 , MK2 , MK3 with one another;

[0029] - a fault identification stage 5 which detects faults occurring in the measurement channels MK1; MK2; MK3 by suitable gating of the output signals 1, 2, 3 of the comparator stage 4, and

[0030] - Output selection level 6.

[0031]The voter 13 (dashed line) comprises a plurality of voter channels 15.1, 15.2, 15.3, wherein each voter channel 15.1, 15.2, 15.3 (dashed line) compr...

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Abstract

The invention relates to a field device for determining or monitoring a process variable in automation technology, wherein the field device satisfies a safety standard that is required in a predetermined safety-critical application, with a sensor (11) operating according to a defined measuring principle and with a control / evaluation unit (12) that processes and evaluates measurement data supplied by the sensor (11) along at least three measuring channels (MK) designed to be redundant and / or diverse, and wherein a voter (13) which consists of a plurality of components that are at least in part designed so as to be doubly redundant, is associated with the control / evaluation unit (12).

Description

technical field [0001] The invention relates to field devices for determining or monitoring process variables in automation technology. The field device is implemented such that it meets the safety standards required in the intended safety-critical application. The field device comprises: a sensor, which operates according to a defined measuring principle; and a control evaluation unit, which processes and evaluates the data transmitted by the sensor along at least three redundantly and / or diversely designed measuring channels. Measurement data. A solution for such a device is known from WO 2004 / 013585 A1. Background technique [0002] In automation technology, especially in process automation technology, field devices are used for determining and monitoring process variables. Examples of such field devices are level measuring devices, flow measuring devices, analytical measuring devices, pressure and temperature measuring devices, humidity and conductivity measuring devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B9/03
CPCG05B9/03
Inventor 罗穆亚尔德·吉拉尔迪
Owner EHNDRESS KHAUZER GMBKH KO KG
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