IC646CSPC002现货 in stock! 欢迎来电咨询~!!
IC646CSPC002,
IC646CSPC002
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~!
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CBL-13-MP-30 Power Cable, MTR-1235, 13xx, 14xx & 1N Series Stepping Motors, 30 Ft.
IC300MIX905 8 DC Inputs (12/24vdc), 6 Relay Outputs (3.0A ea), 4 Analog Inputs (o-20mA, 0-5v, thermister), 2 Analog Outputs (o-20mA, 0-10v)
IC693ADS301 CIMPLICITY 90-ADS Package (First System)
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1492-N49 TERM BLCK 10 Pole Side Jumper
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188-K2C130 Miniature Circuit Breaker 13 A
194L-A25-1753-6N 25 A 194L Load Switch
2090-CNSRPRS-AA07 Kinetix 6000M Network Cable
2090-XB120-03 107 Amp 3 Ohm Resistive Brake Module
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IC600WD050 I/O Cable, 50 feet (15m)
IC800SKCPV050 Power Cable, S2K to 1-2.5kW S-Series Servo Motors, 5 Meters
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2711-NC22 PanelView 15 m to MicroLogix Cable
280-PWRM22G-M015 ArmorStart Three-Phase Power Media
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294D-FD1P5P-G1 Variable Frequency Drive
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1734-485ASC POINT I/O RS-485/422 ASCII Interface
1771-WN 1771 Field Wiring Arm
193-EEVF E1 Plus 55-110 A Overload Relay
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2090-CPWM7DF-10AA25 MP-Series 25m Servo Power Cable
2097-V33PR3 Kinetix 300 Servo Drive
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MSI-PROD Product Management Clients (Additional)
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Operator Interface 2711E-NA2 COMM CARD ADAPTER FOR PANELVIEW 1000E TERMINAL
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IC670MDL641 48VDC Pos./Neg. Logic Input 16 Pt. Grouped
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ST-7641 STXi Expansion Field Power Distribution module, 5, 24, 48, AC 10 Amp no LED status with module ID.
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22B-B5P0C104 PowerFlex 40- 0.75 kW (1 HP) AC Drive
140DDO15310 Quantum 开关量DC输出,32点,5VDC,4组隔离,0.5A/点
284D-FVD7P6D-25-CR-EMI DeviceNet Variable Frequency Drive
E3F3-D12 30cm,扩散反射式 晶体管输出100mA电源:10-30VDC直径18mm
1492-SPM1B080 MCB Supplementary Protector 8 A
6ED1056-5CA00-0BA0 LOGO! 程序存储模块
6ES78220AA000YM0
1497D-A11-M21-0-2 1EN PURPOSE TRANSFORMER
1606-XLSBATASSY4 DC UPS Battery Assembly
1769-L23E-QB1B CMPLX 512KB Enet DI/O Controller
190E-AND2-CB25X 1.6-2.5 A Economy Starter W/Ckt-Bkr
194R-J60-1753 194R Disconnect Switch
2090-CPBM7DF-14AF07 MP-Series 7 m Length Pwr and Brake Cable
2090-XXNPT-16S05 Kinetix Drives 05m Standard Cable
CBL-3T-MB-30 Power/brake cable for MTR-3T50 or MTR-3T60 series servo motors. 30 feet
GF-0903RS-15 Connecting FlashCable to Fischerscope, Mahr, Metronics, OGP, RAM, Sens otec, Weightronix - 15 ft.
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1760-LDFC PicoGFX Processor
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194L-E12-2502 12A 194L Load Switch
2090-CNSSPSS-AA03 Kinetix 6000M network cable
2090-XXLF-TC3100 Kinetix Drives Line Filter
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IC200DTX850 Operator Interface with up to 200 stored messages. 4 x 20 character L CD backlight display, 8 function keys and numeric keypad.
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IC647IGSBSC_M IGS:Industrial Gateway Server Basic Protocols
IC670MDL642 125VDC Pos./Neg. Logic Input, 16 Point, Grouped
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