AB 1785-L20C
2.1 设备选型
在选择设备时，首先要选择有高效抗干扰能力的产品，其中包括了电磁兼容性。尤其是抗外部干扰能力，如采用浮地技术笼隔离性能如的PLC系统:其次还应了解生产厂商给出的抗干扰指标，如共模拟制比、差模拟制比，耐压能力，允许在多大电场强度和多高频率的磁场强度环境中工作；另外是靠考察其在类似工作中的应用实绩。在选择国外进口产品要注意:我国是采用220 V高内阻电网制式，而欧美地区是110 V低内阻电网。由于我国电网内阻大，零点电位漂移大，地电位变化大，工业企业现场的电磁干扰至少要比欧美地区高4倍以上，对系统抗十扰性能要求更高，在国外能正常工作的PLC产品在国内不一定能可靠运行，这就要在采用国外产品时，按我国的标准合理选择。
2.2综合抗干扰设计
主要考虑来自系统外部的儿种抑制措施。主要内容包括:对PLC系统及外引线进行***以防空间辐射电磁干扰；对外弓}线进行隔离、滤波，特别是动力电缆，分层布置，以防通过外引线引人传导电磁干扰；正确设计接地点和接地装置，完善接地系统。另外还必须利用软件手段，进一步提高系统的***性。
厦门岳航计算机工程有限公司
联系人：张芳
热线：0592-5087951+++手机：18030132582
传真：0592-5165561（请注明张芳收，谢谢！）
QQ：2946362425 2825149620
邮箱：2946362425@qq.com
网址：/
地址：厦门思明区湖滨东路湖光大厦8楼B
NEW VICKERS DGMX5PPGH10B REDUCING MANIFOLD THREADED HYD
NEW NATIONAL BULK EQUIPMENT 93007301 120V-AC SOLENOID H
VICKERS DG4V-3-OBL-M-FW?-B6-60 SOLENOID HYDRAULIC VALVE
PARKER PF600B 40HK PARTROL BRASS 3/8IN NPT FLOW CONTROL
NEW PARKER 8081E-1/4AS2P 8000E LO-TORQ HYDRAULIC VALVE
HANNA 135020 M-LINE UNITITE 3/4IN NPT FLOW CONTROL HYDR
PARKER PRM2 PAF-20HW 150-2000PSI PRESSURE RELIEF HYDRAU
NEW VICKERS RV2-10-S-0-50 POPPET PILOT OPERATED RELIEF
PARKER F1020S-20LZ 1/2IN NPT 3000PSI 15GPM FLOW CONTROL
DELTROL F30B THREADED NEEDLE HYDRAULIC VALVE D454787
NEW CTD-VDF CARTRIDGE HYDRAULIC VALVE D284826
VICKERS EHST-3-BIF-30 0.26-0.65GPM PROPORTIONAL PRESSUR
NEW PARKER 8081E-1/4AS2P 8000E LO-TORQ HYDRAULIC VALVE
REXROTH DREM 10-52/200YG24NK?4M PROPORTIONAL PRESSURE RE
NEW DELTROL PIDC30S 3000PSI 1/2 X 1/4IN NPT 12GPM CHECK
NEW PARKER C400B 2000PSI 138BAR 1/4IN NPT 5GPM CHECK VA
CONTINENTAL HYDRAULICS VSD03M-3F-G-33L?-A 120VAC SOLENOI
NEW SUN HYDRAULICS CKGA-XAN CARTRIDGE CHECK VALVE B2068
NACHI SS-G03-A3X-R-01?15-E21 SOLENOID HYDRAULIC VALVE 11
NEW CONTINENTAL VS12M-***-G60L-H DIRECTIONAL SOLENOID HY
NEW NACHI OCY-G01-W-X-20 REGULATOR MODULAR FLOW CONTROL
NEW REXROTH R978874065 4WE6J62/EW110N9?DA/62 SOLENOID HY
TOYO HK3-ET1-03 3/8IN NPT CHECK THREADED HYDRAULIC VALV
NEW HYVAIR D03S-2F-11***-35 115V-AC DIRECTIONAL SOLENOID
NEW PARKER 032501000 1IN NPT 250PSI MAX FLOW CONTROL HY
NEW ARGO HYTOS RPE4-102R11/012?00E1 DIRECTIONAL HYDRAULI
NEW SUN HYDRAULICS RPEE LAN CARTRIDGE RELIEF HYDRAULIC
NEW VICKERS DT8P1-03-5-10 3/8IN NPT CHECK THREADED HYDR
NEW MOOG G761-3504B FLOW CONTROL SERVO HYDRAULIC VALVE
NEW DELTROL C30B PNEU-TROL 1/2IN NPT BRASS 8GPM CHECK H
NEW VICKERS DG4V-3S-2A-M-FW?-H5-60 24V DC SOLENOID HYDRA
VICKERS CVCS25C1S2 CARTRIDGE RELIEF HYDRAULIC VALVE B34
REXROTH ZDR6DA2-43/150Y PRESSURE REDUCING CONTROL HYDRA
NEW REXROTH DR 6 DP2-53/75YM PRESSURE REDUCING CONTROL
NEW VICKERS B061M10A4 DOUBLE A 3/4IN NPT RELIEF THREADE
NACHI OG-G03-P3-E50 MODULAR DIRECTIONAL CONTROL HYDRAUL
SUN HYDRAULICS BBY SANDWICH MANIFOLD HYDRAULIC VALVE W/
REXROTH A306218 DBD S6 K18/315 PRESSURE RELIEF HYDRAULI
NEW PARKER D3W1KY 120V-AC DIRECTIONAL CONTROL HYDRAULIC
VICKERS QG 5 C 10A3 DOUBLE A LINEAR 120V-AC SOLENOID HY
ALEMITE G306741 STEEL THREADED CHECK HYDRAULIC VALVE D4
NACHI OG-G03-P3-E50 MODULAR DIRECTIONAL CONTROL HYDRAUL
NEW PARKER CV101P PILOT OPERATED CHECK THREADED HYDRAUL
NEW ABEX 425-1179 76032 JET-PIPE 4-WAY 20GPM SERVO HYDR
SUN HYDRAULICS BCC PBFB FBN ALUMINUM HYDRAULIC VALVE AS
NEW SUN HYDRAULICS FXCA LBN CARTRIDGE 4.0GPM HYDRAULIC
NEW SUN HYDRAULICS FXCA LBN CARTRIDGE 3.2GPM HYDRAULIC
NEW SUN HYDRAULICS HHN THREADED HYDRAULIC MANIFOLD VALV
VICKERS QF-5-TT-10A3 DOUBLE A DIRECTIONAL CONTROL HYDRA
NEW REXROTH ZDR6DP2-43/150Y?M PRESSURE REDUCING CONTROL
REXROTH DBDS 6 P13/100 HYDRO NORMA FLANGED RELIEF HYDRA
NEW SUN HYDRAULICS FDCB LAN DBA HYDRAULIC VALVE D284251
在线问
