Why users need one twisted-pair bus

被引：0

作者：

ISP Corp., Lima, OH ^{[1
]}

机构：

来源：

Control | 2006年 / 8卷 / 29期

关键词：

Actuators - DC power transmission - Electric power systems - Electric wire - Robustness (control systems);

D O I：

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学科分类号：

摘要：

The challenges faced by several instruments that are trying to overcome the problems of discrete two-wire devices in fieldbus are discussed. The two-wire problem becomes more of a barrier when the user seeks to apply discrete quarter-turn actuators, using fieldbus. A separate DC power source has emerged as an alternative to overcome most of the problems related with discrete two-wire devices in fieldbus. Another can be used as a conventional discrete output point, which is easier and more robust than trying to achieve the same integrity on a field-originated DC power system. Four-wire technologies, which have emerged as an alternative to two-wire devices have serious issues for critical final-element applications. Suppliers need to be encouraged to develop robust two-wire technology as users consider alternatives for their projects.

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