1756-M02AS

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描述

1756-M02AS

 抗干扰设计
为了保证系统在工业电磁环境中免受或减少内外电磁干扰,必须从设计阶段开始便采取三个方面抑制措施:抑制干扰源、切断或衰减电磁干扰的传播途径、提高装置和系统的抗干扰能力。这三点就是抑制电磁干扰的基本原则。PLC控制系统的抗干扰是一个系统工程,要求制造单位设计生产出具有较强抗干扰能力的产品,且有赖于使用部门在工程设计、安装施工和运行维护中予以全面考虑,并结合具体情况进行综合设计,才能保证系统的电磁兼容性和运行可靠性。进行具体工程的抗干扰设计时,应主要注意以下两个方面。
设备选型。
在选择设备时,首先要选择有较高抗干扰能力的产品,其包括了电磁兼容性,尤其是抗外部干扰能力,如采用浮地技术、隔离性能好的PLC系统;其次还应了解生产厂家给出的抗干扰指标,如共模抑制比、差模抑制比、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等;另外是靠考查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220V高内阻电网制式,而欧美地区是110V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,对系统抗干扰性能要求更高。在国外能正常工作的PLC产品在国内工业就不一定能可靠运行,这就要在采用国外产品时,按我国的标准(GB/T13926)合理选择。
综合抗干扰设计。主要考虑来自系统外部的几种抑制措施,内容包括:对PLC系统及外引线进行屏蔽以防空间辐射电磁干扰;对外引线进行隔离、滤波,特别是动力电缆应分层布置,以防通过外引线引入传导电磁干扰;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,进一步提高系统的安全可靠性。
主要抗干扰措施
采用性能优良的电源,抑制电网引入的干扰。
在PLC控制系统中,电源占有极重要的地位。电网干扰串入PLC控制系统主要通过PLC系统的供电电源(如CPU电源、I/O电源等)、变送器供电电源和与PLC系统具有直接电气连接的仪表供电电源等耦合进入的。现在对于PLC系统供电的电源,一般都采用隔离性能较好的电源,而对于变送器供电电源以及和PLC系统有直接电气连接的仪表供电电源,并没受到足够的重视。虽然采取了一定的隔离措施,但普遍还不够,主要是使用的隔离变压器分布参数大,抑制干扰能力差,经电源耦合而串入共模干扰、差模干扰。所以对于变送器和共用信号仪表供电应选择分布电容小、抑制带大(如采用多次隔离和屏蔽及漏感技术)的配电器,以减少PLC系统的干扰。
此外,为保证电网馈电不中断,可采用在线式不间断供电电源(UPS)供电,提高供电的安全可靠性。而且UPS还具有较强的干扰隔离性能,是一种PLC控制系统的理想电源。

产品承诺:
保 证 全新原装进口,
保 证 安全准时发货,
保 证售后服务质量,
优势价格,大量现货。

主营DCS系统配件
机器人系统配件
大型伺服系统配件
品牌:ABB   ,AB  ,GE,FOXBORO,本特利,英维思,伍德沃德,西屋,瑞恩,施耐德,西门子,摩托罗拉,安川。力士乐。ACSO,横河等进口品牌。 专业销售进口DCS  PLC系统备件模块
Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA
  专业销售进口DCS  PLC系统备件模块 15天包退换 一年质保 大量现货  国内实力库存商家

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Edwards Adaptabeacon 107DV2CRINHA-N5 120V Industrial

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Switchmode 240 Power Rectifier Tyco 596B4 Out 24VDC

Flow Monitor SW118* E-T-A (ETA) Flow Vision 115Vac New

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Scientific Columbus XL31K5A2 Transducer Exceltronic NOS

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Watlow Process Control Module 988A-20CE-ASGR New

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Modicon AEG PC-0984-680 Control Module 115/220VAC w/key

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Mistic Controller OPTO 22 Mod. 200 I/O Unit New

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2801-YFX A Machine Vision Camera Body AB Recon.

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ABB Robotics Elmo Servo Motor PS130/6-50-P Sweden

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140R-302 Current Transformer 3000:5 Square D 600V NOS

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Ground Fault Monitor Superintend VRE-80US NOS

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Siemens Simatic TI315 DA CPU In:24VDC 315 Series

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Sy/Max 8030 CRM21 Interface Module 30608-504-50

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RS232PONI Cutler Hammer RS232 RPONI W970630 5299C57G02

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Keyence AS-440-01 120V 240V sensor amplifier

Omron ASCII Basic Module Unit C500-ASCO4 for CPU

B/W Ametek Controls 5200-LF1 Control Relay 52-110100

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Reliance thyristor semiconductor heatsink 7817-1Y

Texas Instruments Model 510 Hand Programmer 2458740-1

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E-T-A Flow Switch Monitor FS10-U1 10A max 24Vdc 2@Lot

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Moore IPT Current Pressure Transmitter

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II-VI Laser Lens 1″ , 3 1/4″ Brass Casing New NOS

8908A001 Asco Electronic Module 24VDC Joucomatic NOS

3134-72 Russellstoll Receptacle 100A 480VAC 250VAC/DC

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Interbus-S Phoenix Contact IBS IP CBK 1/24-F-V3

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Milltronics Airanger SPL Ultrasonic Level Monitor (011)

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4264BC Receptacle Russellstoll 30/60A 250/480VAC

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800H-2HG7 Jog Stop Industrial Switch 600V max Haz Duty

Russellstoll Receptacle JRSA1034H +mt. box 250/600VAC

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System Electric Condensomatic CR2000-8-AT

BLACK BOX LWU200GB-E-US LASER LINK 200GB 155293

EMERSON R313 60 HP ELECTRIC MOTOR 1190 RPM 31026

N. BASE COMMUNICATIONS NH228-IPS IP SWITCH 153044

3M FT520#R2 HOT MELT TOOL KIT 155204

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ICP BHC120M1A 10 TON HP MULTI POSITION FAN COIL 165796

NEW BRUNSWICK C-10* CLASSIC SHAKER 158021

YORK BP060C00N4ABA1 5T 10 SEER ROOFTOP AIR CONDITIONER

US/EMERSON C75P3B 75 HP MOTOR INVERTER TEFC 69706

ELKAY LRPBM28K 2 LEVEL REFRIGERATED WATER FOUNTAIN BODY

COPELAND 2DD3R63KE-TFD-8​00 5T AC/HP COMPRESSOR 166128

WEG 03018ET3ECT286T COOLING TOWER 30HP MOTOR 162438

DAY AND NIGHT PHF342000L00A1 3.5T ROOFTOP AIR CONDITIO

DAYTON ACP060C1342A 5TON ROOFTOP AIR CONDITIONER 151680

CARRIER 19C871479 IMPELLER 5″ IN DIAMETER SHAFT SIZE

CARRIER 19C661469 IMPELLER 3″ DIAMETER 151065

GOULDS PUMPS 0C02214A26-2149 SHAFT ASSY W/GEAR 99056

CARRIER 17M317344 GUIDE VANE ASSEMBLY 150376

OTC 5019 LOW LIFT TRANSMISSION JACK 162354

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TRANE YSC036E4ELA0L 3 TON ROOFTOP AIR CONDITIONER

MTI QSODI6042-BT OVAL BATH TUB SOAKER ONLY/BISCUIT

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CARRIER 17M4241184 SEAL HOUSING 150340

DAYTON 12,000 BTUH PORTABLE AIR CONDITIONER 159684

COPELAND 6RH1-200A-TSK-8​00 20T SEMI HERMETIC 58411

DAYTON 54″ CABINET EXHAUST FAN/RPM 518 156895

DAYTON URT8618 480 VOLT 50KW UNIT HEATER 170,500 BTU

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JACUZZI EH85969 72″FIBERGLASS WHIRLPOOL CENTER DRAIN

BERK-TEK 10033023 8162’SPOOLED FIBER OPTIC CABLE 140158

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JAMESBURY 815W3600TT/GO 10″ BUTTERFLY VALVE 58228

ELKAY ECH81J 115 VOLT REMOTE WATER CHILLER 160849

THERMO SCI 335900AP000 GEN 10 VIS W/OUTPUT PRINTER

BLACK BOX AC1051A CAT5 VIDEO MATRIX SWITCH 159872

SUMITOMO ELECTRIC SE-3NK096A 2862′ 96-STRAND CABLE

CIECOR OPTICAL 060X81-T-31XX24 FIBER OPTIC CABLE 154395

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SQUARE D H365R FUSIBLE SAFETY SWITCH 161058

REZNOR RP400-8 400,000 BTU ROOFTOP DUCT FURNACE 166310

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DAYTON POWER VENTED UNIT HEATER W/ BELT DRIVEN BLOWER

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RUBBERMAID 1046 2-1/2 CUBIC YARD TILT TRUCK 161139

3COM 3C17204-US SUPERSTACK 3 4400 157202

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专业销售进口DCS  PLC系统备件模块

PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家


选择深圳长欣,选择放心,售后无忧大量现货,当天顺丰发货!
主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。