产品详情
随着科学技术的发展,PLC在工业控制中的应用越来越广泛。PLC控制系统的可靠性直接影响到工业企业的安全生产和经济运行,系统的抗干扰能力是关系到整个系统可靠运行的关键。自动化系统中所使用的各种类型PLC,有的是集中安装在控制室,有的是安装在生产现场和各电机设备上,它们大多处在强电电路和强电设备所形成的恶劣电磁环境中。要提高PLC控制系统可靠性,设计人员只有预先了解各种干扰才能有效保证系统可靠运行。
2.电磁干扰源及对系统的干扰是什么?
影响PLC控制系统的干扰源于一般影响工业控制设备的干扰源一样,大都产生在电流或电压剧烈变化的部位,这些电荷剧烈移动的部位就是噪声源,即干扰源。
干扰类型通常按干扰产生的原因、噪声的干扰模式和噪声的波形性质的不同划分。其中:按噪声产生的原因不同,分为放电噪声、浪涌噪声、高频振荡噪声等;按噪声的波形、性质不同,分为持续噪声、偶发噪声等;按声音干扰模式不同,分为共模干扰和差模干扰。共模干扰和差模干扰是一种比较常用的分类方法。共模干扰是信号对地面的电位差,主要由电网串入、地电位差及空间电磁辐射在信号线上感应的共态(同方向)电压送加所形成。共模电压有时较大,特别是采用隔离性能差的电器供电室,变送器输出信号的共模电压普遍较高,有的可高达130V以上。共模电压通过不对称电路可转换成差模电压,直接影响测控信号,造成元器件损坏(这就是一些系统I/O模件损坏率较高的原因),这种共模干扰可为直流、亦可为交流。差模干扰是指用于信号两极间得干扰电压,主要由空间电磁场在信号间耦合感应及由不平衡电路转换共模干扰所形成的电压,这种让直接叠加在信号上,直接影响测量与控制精度。
咱们有着充足的库存,交货期快,库存价值大概3亿人民币,咱们售出的商品都通过专业的测验和认证,且质保期均为一年)期待来电查询,如遇下班时间请发送电子邮件,24小时之内会给你一个满意的答复。
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
COEN ISCAN 2 DSF-2000-MB-UV FLAME SCANNER UNIT 2653-213-02
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Allen Bradley 634385-9 Control Board Rev 5
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
COEN ISCAN 2 DSF-2010-MB FLAME SCANNER UNIT 2653-271-12
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
ABB 3HAB 2136-1/9 Teach Pendant IRB6000 S3
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Adept 10332-00500 VJI Joint Interface Module Board Rev A
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
KUKA PM2 600/25/16 Power Supply Module ANr 00103498
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
BEC Elektronik AS BUF-121-SIO Operator Interface BEC 121 Single I/O
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
ABB 3HAB 2136-1/3 Robot Teach Pendant S3 IRB6000
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
NEW Falk 0706056 13F SteelFlex Coupling Grid
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Siemens 6DR5210-0EN00-0AA3 SIPART PS2 i/p Valve bbbbbbbber
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
NEW Maxon Corporation SRUD-1DA Operator Keypad Module
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
ABB 6668D37A22 A Type KAB Bus Differential Relay Module
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Mitsubishi F1-60MR-ES Programmable Controller 110/120 220/240 VAC 50/60Hz
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
NEW Weir Minerals 40413 Shaft Sleeve GH-9-5
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Square D LAL36400 Shunt Trip Circuit Breaker 400 Amps 600VAC
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
iS5 Ethernet Serial Device Server iDS6-HV-D-1RJ45-1RJ45-4DB09
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
TRW Nelson BEDIENFELD NTR 1X00W1 Stud Welder Control Panel 66-02-14
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Coherent 532-200 DPSS Diode Pumped Green Laser Head with weak laser
Parts Only
4 517 43
Free Shipping
Only 1 left!
5 Watching
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Allen Bradley MPL-A420P-SJ72AA Servo Motor with 070S-MF1-10-1E1-3S Gearbox
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
QSAC 31-50220N12 Servo Control Board
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Honeywell 631773 Case Board Assembly
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
NEW Rosemount 3051S1TG3A2B11A1AB4D4T5 Pressure Transmitter Flowmeter
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
MTS Systems Corporation AC-07-24VS Multi-Axis Servo Amplifier
Pre-Owned
4 517 43
Free Shipping
Only 1 left!
1 Watching
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
NEW Rosemount 3051TG3A2B21AS1B4I5V5 Pressure Transmitter w Remote Seal
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Etsi / Bailey Controls TPS02 infi 90 Turbine Protection Slave Module
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
GE Fanuc 10S/3000 AC Servo Motor A06B-0317-B005#0008
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Ametek Thermox Series 2000 Gas Analyzer Controller Assembly
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
GSE 038241-00500 Socket Wrench Torque Transducer
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
GSE 038252-00101 Socket Wrench Torque Transducer
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
ABB 3HAB 2136-1 Robot Teach Pendant S3
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Yaskawa Electric SGMG-20A2ABC AC Servo Motor
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Woodward 9905-367 Digital Synchronizer and Load Control Rev M
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Polysonics ERS91-F Poly-Level Liquid Level Flow Meter
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Woodward 9905-373 Digital Synchronizer and Load Control Rev P
Pre-Owned
4 517 43
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
ABB DSQC 618_R2 Rectifier Unit 3HAC 14549-2/10A IRC5
Pre-Owned
4 413 19
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Unbranded Flinger Seal for Metso Minerals Slurry Pump
Pre-Owned
4 378 44
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Honeywell 51401491-100 TC LLMUX Mb Rev :F Db HW Rev : D Db FW Rev : E
Pre-Owned
4 378 44
Was: Previous Price 6 254 91
Free Shipping
30% off
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Westinghouse Emerson 5X00167G01 Ovation HART High Perbbbbance Analog Output
Pre-Owned
4 354 11
Was: Previous Price 6 220 16
Free Shipping
30% off
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Basler Electric BE1-40Q Loss of Excitation Relay Module
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
GE SKHA36AT0800 Spectra RMS Circuit Breaker 800A Frame 800A Trip
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Fisher Rosemount CL6821X1-A6 Provox Smart Device Analog I/O Card Rev J
Pre-Owned
4 343 69
Free Shipping
Only 1 left!
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
NEW Kingsbury 78PP278 / 78PP288 Thrust Bearing Cage & Shoe Set (3 Shoes)
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
PHD SFM5 27X625-L9-M-NM22-NN0-NN11-NT22 Pneumatic Cylinder Rail 11909210 02
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
NEW bbbb-Belt / Rexnord MR1317EX Cylindrical Roller Bearing 004110014
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
PDI FOL06894D Wave Warrior MIM/DISP II Interface Board
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
inMotion SAM-PA-400-30-E Sopacel SAM Smart Axis Manager Power Supply
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
IIS Industrial Indexing Systems 77710 Motor Controller MLD-111 Rev 0
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
ABB 48118388 Relay Communication Board V527 481182-001 K-SIDA
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
NEW SKF 5314 ANR/C3 Angular Contact Ball Bearing
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Square D LHL36000M8041 Circuit Breaker 400 Amps 600VAC
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Westinghouse 1C31179G01 Ovation Remote I/O Master Unit
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Sanyo Denki 65AA050VXR01 ABS Super Servo Amplifier Base Module
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Magnetek Emerson WH1-2FF Ovation Power Supply Module 1X00024H01 Rev B
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
Power-One Emerson WH1-2FF Ovation Power Supply Module 1X00024H01 Rev D
Pre-Owned
4 343 69
Free Shipping
Watch
Get fast shipping and excellent service when you buy from Top-rated sellers
Item image
NEW MSA 10053967 Ultima X Power Supply Module 24VDC 11 Watt
4 343 69