描述
为了实现输入输出电路上的完全隔离,近年来在控制系统中光电耦合得到广泛应用,已成为防止干扰的最有效措施之一。光电耦合器具有以下特点:首先,由于是密封在一个管壳内,不会受到外界光的干扰;其次,由于靠光传送信号,切断了各部件电路之间地线的联系;第三,发光二极管动态电阻非常小,而干扰源的内阻一般很大,能够传送到光电耦合器输入输出的干扰信号就变得很小;第四,光电耦合器的传输比和晶体管的放大倍数相比,一般很小,远不如晶体管对干扰信号那么灵敏,而光电耦合器的发光二极管只有在通过一定的电流时才能发光。因此,即使是在干扰电压幅值较高的情况下,由于没有足够的能量,仍不能使发光二极管发光,从而可以有效地抑制掉干扰信号。由于光电耦合器的线性区一般只能在某一特定的范围内,因此,应保证被传信号的变化范围始终在线性区内。为了保证线性耦合,既要严格挑选光电耦合器,又要采取相应的非线性较正措施,否则将产生较大的误差。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
Brooks MT 3819 Flow Meter 1″
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TRICONEX TRICON 8300A POWER MODULE 120V AC/DC
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NEW Foxboro Pressure Transmitter IDP10-D47B21F-M1L1C1K1
NEW FOXBORO PRESSURE TRANSMITTER IDP10-D20D21C-C1K1
TRICONEX TRICON 8310 POWER MODULE 120V AC/DC
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Red Valve,Pinch Valve,Series 75,6″Flanges
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SIEMENS 6ES5-460-7LA11 ANALOG INPUT 8 CHANNELS
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Square D Drive Controller VSD07-U18-S60
Square D Molded Case Breaker LAL36300
ABB High Voltage Sleeve BB-1526-B
Allen-Bradley Brake Chopper Module 1336-WC035
New Foxboro Magnetic Flowtube 8002A-WPR-TJGCNZ-A
Bailey Fisher&Porter ABB Flowmeter 10D1462AE17PD2AD12
Endress+Hauser Flowmeter 33A T08-AD1ED11D21A
UE Systems Grease Caddy Ultraprobe 201
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Foxboro Magnetic Flowtube 9301A-SIBA-PPJ-GL 1″
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Ohio Semitronics Power Transducer PC5
PBM TIH-E5L-A Transmitter Isolation Valve
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Siemens Simatic S7-200&Complete Control Panel
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WTW TetraCon 325 Conductivity Cell
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NEW FOXBORO MAGNETIC FLOWTUBE 8002A-WPR-HJGCNZ-A
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ABB Digital Output 3BHT 300007R1
Foxboro Pressure Transmitter IDP10-DF1B01F-S2R1L1C1K
Foxboro Pressure Transmitter IDP10-D20B01C-K1V
Foxboro Pressure Transmitter IDP10-D20B01C-M1L1C1K1
NEW MODICON AS-J478-010 STAND ALONE MODEM
New Bently Nevada 9200 series Seismoprobe
Square D CH363AWK Heavy Duty Safety Switch 100A
Foxboro Pressure Transmitter IDP10-D20A01C-M1L1C1K1
Foxboro Pressure Transmitter IDP10-D20D01C-M1L1C1K1
Foxboro Pressure Transmitter IDP10-D20D01C-M1L1C1K1
FOXBORO Pressure Transmitter IDP10-DS3B01C
Foxboro Pressure Transmitter IDP10-D20C01C
Foxboro Pressure Transmitter IDP10-D20E01C
ABB I/O Board 3BHT300015R1
Endress+Hauser Mass Flow Meter Tube Promass 63
Honeywell Universal Digital Controller UDC200