DAPC100 库存优惠

易卖工控网（www.ymgk.com）提供”DAPC100 库存优惠”，产品详情：品牌/厂家：PLC-DCS系列、型号：DAPC100、成色：全新、货期：现货 1天内发货、保修：180天，更多产品详情就上易卖工控网。

3 PLC控制系统工程应用的抗干扰设计

　　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，并结合具有情况进行综合设计，才能保证系统的电磁兼容和运行可靠。进行具体工程的抗干扰设计时，应主要以下两个方面。

　　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（EMC），尤其是抗外部干扰能力，如采用浮地技术、隔离能好的PLC系统；其次还应了解生产厂给出的抗干扰指标，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。

3.2综合抗干扰设计

　　主要考虑来自系统外部的几种如果抑制措施。主要内容包括：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，特别是原理动力电缆，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。

4主要抗干扰措施

4.1采用能优良的电源，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

　　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，一般都采用隔离能较好电源，而对于变送器供电的电源和PLC系统有直接电气连接的仪表的供电电源，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。

位保证电网馈点不中断，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。并且UPS还具有较强的干扰隔离能，是一种PLC控制系统的理想电源。

4.2电缆选择的敖设

　　为了减少动力电缆辐射电磁干扰，尤其是变频装置馈电电缆。笔者在某工程中，采用了铜带铠装屏蔽电力电缆，从而降低了动力线生产的电磁干扰，该工程投产后取得了满意的效果。

　　不同类型的信号分别由不同电缆传输，信号电缆应按传输信号种类分层敖设，严禁用同一电缆的不同导线同时传送动力电源和信号，避免信号线与动力电缆靠近平行敖设，以减少电磁干扰。

4.3硬件滤波及软件抗如果措施

　　信号在接入计算机前，在信号线与地间并接电容，以减少共模干扰；在信号两极间加装滤波器可减少差模干扰。

　　由于电磁干扰的复杂，要根本消除迎接干扰影响是不可能的，因此在PLC控制系统的软件设计和组态时，还应在软件方面进行抗干扰处理，进一步提高系统的可靠。常用的一些措施：数字滤波和工频整形采样，可有效消除周期干扰；定时校正参考点电位，并采用动态零点，可有效防止电位漂移；采用信息冗余技术，设计相应的软件标志位；采用间接跳转，设置软件陷阱等提高软件结构可靠。

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JUNIPER PB-1GE-SX-B 1-port Gigabit Ethernet PIC w/ SX

JUNIPER T320 FPC2-E ENHANCED $1500

Juniper EX3200-24T 24-Port 10/100/1000 8-ports PoE

NS-IDP-200 Juniper Netscreen Intrusion Detection IDP200

Juniper Networks PB-PM2 Monitoring Services II PIC

Juniper PB-1GE-SFP-QPP - 1-Port Gigabit Ethernet w/ QPP

Juniper PB-1OC12-SON-SM​IR PB 1OC12 SON SMIR
Expedited shipping available

Juniper PB-4GE-SX PB 4GE SX
Expedited shipping available

Juniper NS-IDP-1000 Intrusion Detection Prevention Appl
One-day shipping available

Juniper PB-TUNNEL PB TUNNEL
Expedited shipping available

Juniper M160 Chassis Internet Backbone Router M 160 

Juniper P-1GE-SFP 1-Port Gigabit Ethernet PIC M20 M40

Juniper XENPAK-1XGE-LR Genuine Juniper XENPAK-1XGE-LR
Expedited shipping available

Juniper PB-1GE-SFP 1 Port Gigabit PIC Module
Used in M320 T320 M40 systms - 1 Year Warranty
One-day shipping available

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Juniper SSG-140-SB Secure Services Gateway GF

Juniper IB-OC192-SON-SR​2-B

Juniper M160BASE-DC M160 Base Unit 1 RE-333-768

Juniper M40E-FPC1-EP M40E-FPC1-EP Enhanced Plus M40E

Juniper PB-1CHOC3-SMIR-​QPP

Juniper PB-1GE-SX-B 1-port Gigabit Ethernet PIC w/ SX

JUNIPER NETWORKS SFM-16-S FOR M40e / M160 ROUTER
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JUNIPER M5 Router w/ RE-333-768-S, 2AC Pwr (M5BASE-AC)

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JUNIPER NETWORKS FAN TRAY FFANTRAY-MX960-​S 760-014968
One-day shipping available

Juniper M20 System W/Cards 90 Day Warranty

Juniper Networks J6350-JB Services Router w 1024MB RAM 


Juniper M20 M10 M5 M7i PE-1GE-SX-B 1-Port Gig. Warranty

JUNIPER PE-1CHOC12-DS3-​SMIR M5/M10
1-year Warranty! Free Shipping!

JUNIPER NETWORKS PE-4E3-ATM 4 PORT PIC NEW OPEN BOX

Juniper Networks M5BASE-AC M5 Base Unit with AC Power

Juniper FEB-M10i-M7i-S M7i / M10i Forwarding Engine

Juniper / Netscreen 208B Baseline Firewall / VPN Applia
One-day shipping available

Juniper M40 BASE 2xDC w/ RE-M40-333-768 2xSCB-E BIN=FPC

Juniper PB-OC48-SON-SMS​R 1-Port OC48 Sonet SM Type2 PIC
Free Overnight Shipping - 90 Day Warranty!

Juniper NS-ISG-TX2 2prt 10/100/1000TX Ethernet ISG-2000
90 Day Hardware Warranty - Free Shipping!

Juniper FEB-M10i-M7i-S M7i M10i Forwarding Engine CFEB
90 Day Hardware Warranty - Free Shipping!

Juniper PE-2E3-ATM2 2-port E3 ATM2 IQ PIC M7i M10i
90 Day Hardware Warranty - Free Overnight Shipping!

Juniper J2350-JH J-Series Services Router J2350
90 Day warranty - Free Shipping!

Juniper NetScreen NS-5000-2XGE Card tested + warranty

JUNIPER NETWORKS PB-AS2 ADAPTIVE SERVICES II PIC NOB
NEW OPEN BOX 90 DAY WARRANTY

Juniper M40 Router 

Juniper JXU-16GE-TX-S UPIM 16Port 1000bT for J & SSG
90 Day warranty - Free Overnight Shipping!

New Juniper PC-1OC192-SON-S​R2 OC192 PIC M160/T320/T640 
1 YEAR WARRANTY ( 10 Million in Stock, See Our Store )

RE-1600-2048-R Juniper RE-1600 T1600 T640 T320 4.0

Juniper P-1GE-LX-B 1port Gig Eth PIC M20 M40 FREESHIP 

JUNIPER PC-TUNNEL - Tunnel Services PIC, 10Gbps

JUNIPER ES2-4GS1-MOD-A E320 4GB LINE MODULE IPU2AFJ
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Juniper PB-4OC12-SON-SM​IR Module GF

Juniper PB-2GE-SX Physical Interface Card - M160
SHIPS TODAY! 1 YR WRNTY! 5+ Avail. Make an Offer!
One-day shipping available

JUNIPER IB-OC192-SON-SR​2 SONET/SDH STM-64/OC-192 M160
One-day shipping available

JUNIPER P-MCDS3 M20 & M40 TESTED WITH WARRANTY

Juniper Networks - Expansion module EX-UM-2X4SFP
Brand New & Ready To Ship From A US Authorized Reseller

NEW JUNIPER JXU-8GE-TX-S Juniper 8-port Gigabit Etherne