A02B-0265-B503现货 in stock! 欢迎来电咨询~！！

A02B-0265-B503,

A02B-0265-B503

一般工业控制系统既包括弱电控制部分，又包括强电控制部分。为了使两者之间既保持控制信号，又要隔绝电气方面的，即实行弱电和强电隔离，是保证系统工作稳定，设备与操作人员安全的重要措施。

　　电气隔离目的之一是从电路上把干扰源和易干扰的部分隔离开来，从而达到隔离现场干扰的目的。

　　一、信号隔离

　　信号的隔离目的之一是把引进的干扰通道切断，使测控装置与现场仅保持信号，不直接发生电的。工控装置与现场信号之间常用的隔离方式有光电隔离、脉冲变压器隔离、继电器隔离和布线隔离等。

　　1.光电隔离

　　光电隔离是由光电耦合器件来完成的。其输入端配置发光源，输出端配置受光器，因而输入和输出在电气上是完全隔离的。由于光电耦合器的输入阻抗(100Ω～1kΩ)与一般干扰源的阻抗(105～106Ω)相比较小，因此分压在光电耦合器的输入端的干扰电压较小，它所能提供的电流并不大，不易使半导体二极管发光。另外光电耦合器的隔离电阻很大(约1012Ω)、隔离电容很小(约几个pF)，所以能阻止电路性耦合产生的电磁干扰，被控设备的各种干扰很难反馈到输入系统。

　　光电耦合器把输入信号与内部电路隔离开来，或者是把内部输出信号与外部电路隔离开来，如图1所示。开关量输入电路接入光电耦合器后，由于光电耦合器的隔离作用，使夹杂在输入开关量中的各种干扰脉冲都被挡在输入回路的一侧。由于光电耦合器不是将输入侧和输出侧的电信号进行直接耦合，而是以光为媒介进行耦合，具有较高的电气隔离和抗干扰能力。

　　目前，大多数光电耦合器件的隔离电压都在2.5kV以上，有些器件达到了8kV，既有高压大电流大功率光电耦合器件，又有高速高频光电耦合器件(频率高达10MHz)。常用的器件如4N25，其隔离电压为5.3kV；6N137，其隔离电压为3kV，频率在10MHz以上。

　　2.脉冲变压器隔离

　　脉冲变压器的匝数较少，而且一次绕组和二次绕组分别绕于铁氧体磁芯的两侧，这种工艺使得它的分布电容特小，仅为几个pF，所以可作为脉冲信号的隔离元件。脉冲变压器传递输入、输出脉冲信号时，不传递直流分量，PLC使用的数字量信号输入/输出的控制设备不要求传递直流分量，因而在工控系统中得到了广泛的应用。

　　图2是脉冲变压器的应用实例。电路的外部信号经RC滤波电路和双向稳压管抑制常模噪声干扰，然后输入脉冲

　　变压器的一次侧。为了防止过高的对称信号击穿电路元件，脉冲变压器的二次侧输出电压被稳压管限幅后进入测控系统内部。一般地说，脉冲变压器的信号传递频率在1kHz～1MHz之间，新型的高频脉冲变压器的传递频率可达到10MHz。

　　3.继电器隔离

　　继电器的线圈和触点没有电气上的，因此，可利用继电器的线圈接受信号，利用触点发送和输出控制信号，从而避免强电和弱电信号之间的直接接触，实现了抗干扰隔离。

　　图3是继电器输出隔离的实例示意图。在该电路中，通过继电器把低压直流与高压交流隔离开来，使高压交流侧的干扰无法进入低压直流侧。

　　4.布线隔离

　　将微弱信号电路与易产生噪声污染的电路分开布线，zui基本的要求是信号线路必须和强电控制线路、电源线路分开走线，而且相互间要保持一定的距离。配线时应区别分开交流线、直流稳压电源线、数字信号线、模拟信号线、感性负载驱动线等。配线间隔越大，配线越短，则噪声影响越小。但是，实际设备的内外空间是有限的，配线间隔不可能太大，只要能维持zui低限度的间隔距离便可。

　　附表列出了信号线和动力线之间应保持的zui小间距。如果受环境条件的限制，信号线不能与高压线和动力线等离得足够远时，就得采用诸如信号线路接电容器等各种抑制电磁感应噪声的措施。

上亿库存，国内外近千个仓库，公司部分产品型号如下，欢迎联系哦~！

ControlLogix/1756 System 1756-IA32 74-132 VAC INPUT 32 PTS (36P)

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2085-ECR Micro800 Expansion Module End Cap

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GC646MSS101 Proficy GlobalCare Complete for Logic Developer - State Standard w/Programming Cable

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IC630MDL301RR 24Vdc Sink Input Module (16 points)

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CompactLogix System 1769-IR6 6 CHANNEL RTD/RESISTANCE INPUT MODULE

PLC-5/1771 System 9399-FW5FBGR RSLGIX FRAMWRKS FUNCTION BUILD.GET'G RESULTS GUIDE

Distributed I/O 1799-MP20 PLASTIC MOUNTING PLATE/4 SCREWS-20 PT BOARD

Operator Interface 2711P-T6C3D PV PLUS 600 COLOR, TOUCH, DH485, DC PS

Support 9342-L2200R SUPT REINSTATEMENT CONTRACT FOR 9342L2200

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ABI31200C2P/ABD QUICKPANEL 10.5" TFT W/AB DH+

IC200UMB001 VersaMax Micro 64, User Program Memory Module. Compatible with VersaMaxMicro 64 only.

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25-PM2-D4P0 PowerFlex 520 1.5kW (2Hp) Power Module

2711P-RP8A PanelView Plus 6 700-1500 Logic Module

FRN3.7G11S-4CX 6.9KVA 9.0A 3.7 KW 3相AC380V/50Hz/60Hz

1492-J50 50 square mm Feed-Through Terminal Block

1492-SPM3D500-N MCB Supplementary Protector 50 A

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CPU 模块 6ES7 516-3AN01-0AB0 CPU 1516-3 PN/DP，1 MB 程序，5 MB 数据；10 ns ；集成 X1: 2x PN 接口，X2: 1x PN 接口，X3:1x DP 接口

152H-C135XBD-50-8L SMC-3 Pump Panel w/Line Prot.Module, FB

1738-OB8EM12 ArmorPoint 8 Point Output Module

1784-U2DN DeviceNet to PC USB Interface Cable

193-NREC5ZZ E3 Plus Replacement Overload Relay

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2090-CSBM1DE-18AA05 Kinetix Cable Single DSL 2090-Series

20AB9P6A3AYNACG0 PowerFlex 70 AC Drive 9.6 A at 3 Hp 20A

GA647IFPRSR00900 GCA iFIX Profsnl SCADA 900 I/O Srv

GP647IFPLDV00075 GCP iFIX Plus SCADA 75 I/O Dev

IC600BF913RR 10-50Vdc Sink Output Module

IC647HSTCR20000KM Collector Redundancy Option for Historian - Standard Server 20,000,000 Points (M4 Key)

IC647TPD910 CIMPLICITY HMI ProServer 10000 I/O Development and Runtime

IC693PCM301RR Programmable Coprocessor Mod, 85K, w/Port Expansion Cable

IC756MDV000E-98 DV Development - Alpha OpenVMS Op Sys, English, Version 9.8

MicroLogix 1000/1761 System 1761-L32AWA 32 I/O MICROLOGIX 1000

PLC-5/1771 System 1771-IL ANALOG INPUT MODULE

Distributed I/O 1792D-4BV0D 4 SINK/SOURCE INPUTS, 4 CONNECTORS

Communications 9300-RADM1 SERIES A REMOTE ACCESS MODEM (DESK TOP WITH CABLE)

Operator Interface D6190-6.5.15 CNTRLVW RAM 4MB ENHANCED MEMORY CARD(6190-MB14)MNL

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RSI Software Products 9356-PRO2500U8 UPGRADE: IN-SUPT: RSSQL PROF.5000 TO 70000 TAG

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44A735538 CPU323 Upgrade Kit latest revision

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IC694ALG391 OUTPUT MODULE ANALOG 2 POINT CURRENT

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22D-B024N104 PowerFlex 40P- 5.5 kW (7.5 HP) AC Drive

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IC647PRTEE010C Proficy Portal Enterprise Edition Client Pack 10 Users (M1 Key)

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284D-FHD7P6Z-25-CR-DB-SB DeviceNet Variable Frequency Drive

CJ1W-AD081-V1 8点模拟量输入单元（1-5V,0-5V,0-10V,-10-10V,4-20MA）分辨率：1/8000

1492-RTB14N 14-Pole Screw Style Rtb Plug

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变送器 3RS17032AD00

1497A-A3-M8-3-N Control Power Transber

1606-XLP60EQ AC or DC Input 24 to 48VDC Out 60W PS

1768-EWEB CompactLogix Enhanced Web Server Module

188-K4C160 Miniature Circuit Breaker 16 A

194R-30-NJ 194R 30 Ampere 4th Power Pole Module

2090-CPBM7DF-10AA40 MP-Series 40m Standard Cable

2090-XXNPMP-10S60 MP-Series 60 m Length Power Cable

CBL-13-ED-10 Encoder cable for MTR-1235 or MTR-1300 or MTR-1400 or MTR-1N series stepping motors connected to IMC or S2K. 10 feet

GC647SVB001 GCScheduler Visma Business Adapter