.目前,DCS与现场仪表之间最流行的连接方式为主干线-分支的拓扑结构。主线,即主干线,将能量和数据输送到现场。然后分送到每个支线上,即分支。
接线箱位于现场仪表附近.分支可长达120米,通常情况为60米.智能接线箱要采用有认证的供危险区使用的安装方式,并预先进行设定。
现场总线接线箱是一个可选的用于设定参数和防护的设备。现场仪表连接方式举例:本质安全型, 无火花型以及EX d型
Pepperl+Fuchs推出大功率主干线 的概念{/strong>克服了防爆装置供电的局限性。大功率主干线的发明者第一次将智能接线箱引入到过程控制行业的现场总线中。任何防爆方法都可以通过可靠被认证的现场分线箱得以使用,几乎可实现任何连接。
实际操作中,主干线供电达到31V,500mA,不受防爆概念的限制。智能接线箱-无论就现场总线安全栅还是段保护器-都可以安装在现场仪表附近.这样,连线达到最大化,连接很多的仪表,同时,简少了对防爆方法的确认。如今, 安装和维护人员都从大功率主干线中受益匪浅,因为 现场仪表可以在运行的情况下被安装,重新设定或是维护--所有这些都无需在线操作许可。
FieldConnex installation components are presented as follows:
Intrinsic safety Ex ia, Ex ib
For Zone 1 / Division 2
Intrinsic safety Ex ic
Non-incendive Ex nL
Flame proof Ex d
General purpose area with short-circuit protection
Intrinsic safety or general purpose area
Simple fieldbus couplers
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