手机版av在线_96精品国产aⅴ在线观看_中文字幕35页_国产亚洲成AV人片在线观黄桃_全黄性色大片_免费视频h

上海京度電子科技有限公司

MPR E-Scan在線折光儀 HART通信協(xié)議

時間:2018-8-18閱讀:1207

The Highway Addressable Remote Transducer Protocol, also known as HART, is a communications protocol which ranks high in popularity among industry standards for process measurement and control connectivity. HART combines analog and digital technology to function as an automation protocol. A primary reason for the primacy of HART in the process control industry is the fact that it functions in tandem with the long standing and ubiquitous process industry standard 4-20 mA current loops. The 4-20 mA loops are simple in both construction and functionality, and the HART protocol couples with their technology to maintain communication between controllers and industry devices. PID controllers, SCADA systems, and programmable logic controllers all utilize HART in conjunction with 4-20 mA loops.

HART instruments have the capacity to perform in two main modes of operation: point to point, also known as analog/digital mode, and multi-drop mode. The point to point mode joins digital signals with the aforementioned 4-20 mA current loop in order to serve as signal protocols between the controller and a specific measuring instrument. The polling address of the instrument in question is designated with the number ì0î. A signal specified by the user is designated as the 4-20 mA signal, and then other signals are overlaid on the 4-20 mA signal. A common example is an indication of pressure being sent as a 4-20 mA signal to represent a range of pressures; temperature, another common process control variable, can also be sent digitally using the same wires. In point to point, HART’s digital instrumentation functions as a sort of digital current loop interface, allowing for use over moderate distances.

HART in multi-drop mode differs from point to point. In multi-drop mode, the analog loop current is given a fixed designation of 4 mA and multiple instruments can participate in a single signal loop. Each one of the instruments participating in the signal loop need to have their own unique address.

Since the HART protocol is a standardized process control industry technology, each specific manufacturer using HART is assigned a unique identification number. This allows for devices participating in the HART protocol to be easily identified upon first interaction with the protocol. Thanks to the open protocol nature, HART has experienced successive revisions in order to enhance the performance and capabilities of the system relating to process control. The standardization of “smart” implementation, along with the ability to function with the legacy 4-20 mA technology and consistent development, has made HART a useful and popular component of the process measurement and control industry framework.

會員登錄

X

請輸入賬號

請輸入密碼

=

請輸驗證碼

收藏該商鋪

X
該信息已收藏!
標簽:
保存成功

(空格分隔,最多3個,單個標簽最多10個字符)

常用:

提示

X
您的留言已提交成功!我們將在第一時間回復您~

以上信息由企業(yè)自行提供,信息內容的真實性、準確性和合法性由相關企業(yè)負責,儀表網(wǎng)對此不承擔任何保證責任。

溫馨提示:為規(guī)避購買風險,建議您在購買產(chǎn)品前務必確認供應商資質及產(chǎn)品質量。

在線留言
主站蜘蛛池模板: 国产精品一区自拍 | 国产高清精品软件 | 精品久久中文字幕97 | 宅男一区 | 狠狠操一区二区三区 | 中文字幕97在线 | 91丨porny丨九色 | 四虎国产成人 | 亚洲AV无码成人专区 | 天天躁日日躁狠狠躁欧美老妇小说 | 免费观看黄色av | 日韩精品一区二区三 | 暖暖视频在线观看免费 | 99精品国产再热久久无毒不卡 | 亚洲第一无码精品立川理惠 | 亚洲第一网站男人都懂 | 伊人一区二区三区 | 久久精品国产亚洲A∨麻豆 日本在线看片免费人成视频 | 91视频在线观看网 | 国产精品久久一区主播 | 日韩免费一区 | 国产精品色拉拉 | 1769在线视频| 91精品一区二区三区在线观看 | 久久久国产精品 | 成熟人妻换╳╳╳╳ | 久久男女| 欧美久久一二区 | 精品91一区二区三区 | 4438五月综合 | 中国丰满大乳乳液 | 亚洲精品乱码久久久久膏 | 新超碰97 | 在线啪啪 | 男人一级片 | 99精品偷拍视频一区二区三区 | 日韩免费视频一区 | 久久亚洲AⅤ精品网站 | 国产亚洲精品一区二555 | 亚洲国产成人精品无码区在线观看 | 日韩精品一区二区三区免费观看 |