关键字:罗斯蒙特 http://www.whdkm.net/ 罗斯蒙特275通讯器与任何Hart协议相容的设备在4~20 mA回路的任何点接入,但在手操器的接入端子和电源之间必须提供最小负载为250电阻。Hart手操器通过高频数传讯号技术叠加在标准的4~20 mA电流传送回路中,从而实现回路的通信。因为加在回路上总的高频信号电压为零,所以通信信号不会干扰测量为4~20 mA讯号。 罗斯蒙特275通讯器在校验室进行通信时,将变送器与通信器连接,还需要1台12~45 VDC稳压电源和标准电流表。为了进行通信,在电源和罗斯蒙特275接口端子之间必须要有不小于250 2的电阻,这一点非常重要,大多数的通信故障都是由于没有满足这个通信条件而引起的。在校验室进行调校时,必须在接线端子处串接1个标准250的电阻以避免通信故障;若在安装现场进行通信时,一般可以直接通信。德科蒙过程控制(武汉)有限公司座机:027-88062221传真:027-88068180邮箱: sales@whdkm.com地址:武汉市武昌区中南国际城D座一单元901室原文出处: http://www.whdkm.net/html/589.htmlABSolute;top:0;border:0;width:undefinedpx;height:undefinedpx;" SANdbox="allow-forms allow-popUPS allow-popups-to-escape-sandbox allow-same-origin allow-scripts allow-top-navigation-by-user-activation" frameborder="0" src="https://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-6745515041074118&ouTPUt=html&adk=1812271804&adf=3279755396&plat=1%3A32776%2C2%3A32776%2C8%3A134217728%2C9%3A134250504%2C16%3A8388608%2C17%3A32%2C24%3A32%2C25%3A32%2C30%3A1081344%2C32%3A32&format=0x0&url=https%3A%2F%2Fwww.bizrobot.com%2Fcompany_bloginfo.php%3Fact%3D1&ea=0&flash=32.0.0&pra=5&wgl=1&dt=1618215860505&bpp=4&bdt=217&idt=111&shv=r20210406&cbv=r20190131&ptt=9&saldr=aa&cookie=ID%3D5fb7eae809183df8-22fd78660ec40024%3AT%3D1602660717%3ART%3D1602660717%3AS%3DALNI_MYMQQp2TnvCbvJQtTRQsdNX_-71Bg&nras=1&correlator=2108897925664&frm=23&ife=1&pv=2&ga_vid=1487934767.1618215861&ga_sid=1618215861&ga_hid=919639400&ga_fc=0&nhd=1&u_tz=480&u_his=8&u_java=0&u_h=1080&u_w=1920&u_ah=1030&u_aw=1920&u_cd=24&u_nplug=17&u_nmime=34&adx=-12245933&ady=-12245933&biw=1435&bih=698&isw=730&ish=360&ifk=2699508910&scr_x=0&scr_y=0&eid=42530672%2C44735931%2C31060030%2C31060711%2C44740079%2C44739387&oid=3&pvsid=4420823340920066&pem=16&ref=https%3A%2F%2Fwww.bizrobot.com%2Fcompany_bloginfo.php%3Fadd_suc%3D1&eae=2&fc=1920&brdim=0%2C0%2C0%2C0%2C1920%2C0%2C1920%2C1030%2C730%2C360&vis=1&rsz=%7C%7Cs%7C&abl=NS&fu=4&bc=31&ifi=1&uci=1.b1dy8f109tmb&fsb=1&dtd=180" marginwidth="0" marginheight="0" vspace="0" hspace="0" allowtransparency="true" scrolling="no" allowfullscreen="true" data-google-container-id="1.b1dy8f109tmb" data-load-complete="true"> |