描述
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。
Edwards Vacuum EPX 180L Dry Pump 400V, 6 month Warranty
New Leybold Turbovac 1000C vacuum pump with controller
incl. Leybold Turbotronik NT1000/1500 VH includes cable
Balzers DIFF500A Diffusion Pump 500mm (20″)
Rotor for Nash HP-8 liquid ring compressor, SS
BOC Edwards Dry Vacuum Pump iQDP80 with QMB500 Rebuilt
BOC Edwards Dry Vacuum Pump iQDP80 with QMB1200 Rebuilt
NASH CL3001 VACUUM PUMP 3000 CFM 10″ HG BELT DRIVE
Republic Regenerative Blower HRB1402 ring side channel
Up to 776 cfm and