PM866A 3BSE076359R1 ABB

Local bus or field bus-a data communication network generally composed of twisted pair wires,because the connected equipment is a primary element or control equipment that is directly connected with the production process,so the working environment is harsh,the failure rate is high,and it is easily affected by maintenance personnel.misoperation and affect the production process.In addition,the bus itself will also cause communication failures for various reasons.An effective measure to prevent such failures is to properly handle the connection point between the local bus and the local device first.When disassembling and assembling the equipment,the normal operation of the bus shall not be affected.The bus branch should be installed in a place that is not easy to touch.At the same time,it is best to adopt two-way redundancy in the bus to improve the reliability of communication.

就地总线或现场总线-般由双绞线组成的数据通信网络，由于其连接的设备是与生产过程直接发生联系的一次元件或控制设备，所以工作环境恶劣，故障率高，容易受到检修人员的误动而影响生产过程。另外，总线本身也会因种种原因造成通信故障。防止此类故障的有效措施是：首先要将就地总线与就地设备的联接点进行妥善处理。拆装设备时，不得影响总线的正常运行，总线分支应安装在不易碰触的地方，同时，就在总线最好是采用双路冗余酝置，以提高通信的可靠性。