西屋 1c31116g04 良好的接地是保证plc可靠工作的重要条件，可以避免偶然发生的电压冲击危害，还可以抑制干扰。完善的接地系统是plc控制系统抗电磁干扰的重要措施之一。 plc控制系统属高速低电平控制装置，应采用直接接地方式。为了抑制加在电源及输入端、输出端的干扰，应给可编程控制器接上地线，接地点应与动力设备（如电机）的接地点分开。若达不到这种要求，也必须做到与其他设备公共接地（如图一），禁止与其他设备串联接地（如图二）。接地点应尽可能靠近plc。集中布置的plc系统适于并联一点接地方式，各装置的柜体中心接地点以单独的接地线引向接地极。分散布置的plc系统，应采用串联一点接地方式。接地极的接地电阻小于2ω，接地埋在距建筑物10～15m远处，而且plc系统接地点必须与强电设备接地点相距10m以上。 厦门仲鑫航自动化设备有限公司 联系人：张芳 电话：0592-5087951 +手机：18030132582 传真：0592-5165561（请备注张芳收，谢谢！） 业务：2851195447 email：285119 地址：厦门思明区湖滨东路湖光大厦8楼 3com 3c905b-fx-sc fast etherlink xl pci assy 03-0149-10... black box fa065 db09f-rj45 network adapter db09f-rj45 dell 3g939 floppy disk drive module 1.44mb 3.5inch ref. lot of 3 new black box corp. edp# 526558 adapte sca-2... lot of 2 new black box fa412-r2 emi/rfi shielded gender... lot of 6 new black box fa066 network adapte db09m-rj4... lot of 2 new icc ic1078e5iv ivory cat5e keystone rj45 m... black box ic 237a-f 232 to 530 interface converter new allen tel products gbstc-d2-03 fiber optic patchcor... d link bdes1105a model des-1105 ethernet switch 5port 1... lot of 6 new startech 10 ft. usb a-b cables model: usbf... new compaq 159074-001 serial cable 6ft 73-0854 rev. c new panduit cfp2ei mini-com faceplate classic series new lot of 3, telesis 1987-56094 top roller plunger, 19... atlas copco qmm 340 25 controller module 4240 0308 80, ... agastat src72qmma timing relay new nib ametek/hunter ml-2921 spring ml2921 lot of 2 fisher-rosemoun?t 01984-3800-1815?, 01984-3800-1... new exair line vac aluminum asco c131204 disceal assembly 1/2 8290 new computer identics a1-66010-1 fixed code processor fcp-i... new bodine electric 30r2beci 1 phase motor lot of 2 namco kk109g4 coils 110/120/60 lot of 3 allen bradley 1747-pic series a interface conv... includes 1747-c10 ser. b cables used deublin co. 1005-020-019 air-hydraulic monoflow un... white roge 1541-5 style b2 refrigeration pressure con... nib ifm efector di5003 seor dia3010-zpkg dvt 800-4md55 series 800 camera controller 8004md55 samson 3771-0 pneumatic positioner 37710 fabr. nr. 1900... metso fpus a413346 backup standby battery 110v 60hz 3a ingeoll-rand q500-2300h15-?11-2c quantum electric ch... sieme 6es5-513-3mb11 simatic s5 bubble memory module ... automatic valve l0502aawr-db fanuc a03b-0807-c104 input module a03b0807c104, aid16d ... johon controls t-8500 remote bulb thermostat t8500 foxboro 557 square root extractor iout 3-15 psi, 403 ... lot of 6 namco t109c 11w coils 115v, 60cy ge fanuc ic610chs100b series one programmable controlle... lot of 2 namco ee510-92440 proximity switches 9way 25mm... armstrong a-6942 duct hygrostat a6942 lot of 16, metabo a24-r-bf-80 7x1/4x5/8/-11, type 27 gr... tramation 210a-20 current alarm 50/60hz 210a20 browning bk57 bush bore taper v-belt pully