1747-M15
1747-M15
PLC的输入输出电路与内部CPU是电隔离。其信息靠光耦器件或电磁器件传递。而且,CPU板还有抗电磁干扰的屏蔽措施。故可确保PLC程序的运行不受外界的电与磁干扰,能正常地工作。
PLC使用的元器件多为无触点的,而且为高度集成的,数量并不太多,也为其可靠工作提供了物质基础。
在机械结构设计与制造工艺上,为使PLC能安全可靠地工作,也采取了很多措施,可确保PLC耐振动、耐冲击。使用环境温度可高达摄氏50多度,有的PLC可高达80--90度。
有的PLC的模块可热备,一个主机工作,另一个主机也运转,但不参与控制,仅作备份。一旦工作主机出现故障,热备的可自动接替其工作。
还有更进一步冗余的,采用三取一的设计,CPU、I/O模块、电源模块都冗余或其中的部分冗余。三套同时工作,最终输出取决于三者中的多数决定的结果。这可使系统出故障的机率几乎为零,做到万无一失。当然,这样的系统成本是很高的,只用于特别重要的场合,如铁路车站的道叉控制系统。
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厦门泰尼电气有限公司
Xiamen Thani Electric Co.,Ltd
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【商家简介】厦门泰尼电气有限公司专业销售大型控制系统及各种进口模块备件(DCS系统)厦门泰尼电气有限公司是一家多年专业从事大型系统(DCS)备件销售ABBAdvantOCS,ABBMOD30/MODCELL,ABBMOD300,ABBBaileyINFI90,ABBProcontic,ABBProcontrol,HBContronic,MooreAPACS,MoorePanelControllers,RosemountRS-3,SiemensIskamatic,SiemensSimaticS5,SiemensSima...
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