随着微处理器、计算机和数字通信技术的飞速发展,计算机控制已扩展到了几乎所有的工业领域。现代社会要求制造业对市场需求作出迅速的反应,生产出小批量、多品种、多规格、低成本和高z量的产品,为了满足这一要求,生产设备和自动生产线的控制系统必须具有极高的性和灵活性,PLC(Programmable Logic Controller,可编程序控制器)正是顺应这一要求出现的,它是以微处理器为基础的通用工业控制装置。
PLC的应用面广、功能强大、使用方便,已经成为当代工业自动化的主要装置,在工业生产的所有领域得到了的使用,在其他领域(例如民用和家庭自动化)的应用也得到了迅速的发展。
电工委员会(IEC)在1985年的PLC标准草案第3稿中,对PLC作了如下定义:“可编程序控制器是一种数字运算操作的电子系统,z为在工业环境下应用而设计。它采用可编程序的存储器,用来在其内部存储执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令,并通过数字式、模拟式的输入和输出,控制各种类型的机械或生产过程。可编程序控制器及其有关设备,都应按易于使工业控制系统形成一个整体,易于扩充其功能的原则设计。”从上述定义可以看出,PLC是一种用程序来改变控制功能的工业控制计算机,除了能完成各种各样的控制功能外,还有与其他计算机通信联网的功能。
公司名称:福建中立恒自动化设备有限公司
地址:福建省福州市鼓楼区温泉街道五四路9号宁德大厦(宏福大厦)10层1064室
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Woodhead 409P80 Multi-Port Interconnect System
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WOODHEAD 206000A0F060 6P FEMALE 6 CORD
WOHNER 6032 FUSE BLOCK / BUSBAR ADAPTER 690V 32A CONDITION
WIREMOLD CLWEC CHAN-L-WIRE CABLE ENDCAP/PULLER (5)
WIREMOLD CLWC CHAN-L-WIRE COUPLING 78677603839 (5)
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WIRE WIZARD A5 DISCONNECT (SET OF 5)
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WHITTET HIGGINS PN-40 PRECISION RETAINING NUT
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WESTLOCK 2007SBY2B4M020000724 CONTROL POSITION MONITOR 24V / 25-250V
WESTINGHOUSE T000NB LUG BARREL T3 TERMINAL CONNECTOR 3/0 500 MCM
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WESTINGHOUSE S-86530 FACTORY REPLACEMENT COIL #00 0/220V NOS CONDITION
WESTINGHOUSE S-3489 FACTORY REPLACEMENT COIL TYPE AB BKR NOS CONDITION
WESTINGHOUSE MSH-.9A MS STARTER HEATER ELEMENT .52-.67 FLA (SET OF 3)
WESTINGHOUSE MODEL 78C603G0 COIL 0/20V NNB!!!
WESTINGHOUSE ITEK-600 CURRENT SENSOR 000-600A STYLE 887A57H0 CONDITION
WESTINGHOUSE HKB325T TRIP UNIT 2 40C 3-POLE NNB!!
WESTINGHOUSE FH79 79C39G09 HEATER ELEMENT 34.6-4.5 FLA (SET OF 3)
WESTINGHOUSE FH3 77C524G3 HEATER ELEMENT .78-.85 FLA (SET OF 3)
WESTINGHOUSE FH27 77C524G27 HEATER ELEMENT 2.59-2.83 FLA (SET OF 3)
WESTINGHOUSE FH0 77C524G0 HEATER ELEMENT .5-.55 FLA (SET OF 3)
WESTINGHOUSE FH 77C524G HEATER ELEMENT .64-.70 FLA (SET OF 3)
WESTINGHOUSE F288 .750 KVA TYPE MTA TRANSFORMER
WESTINGHOUSE ELECTRIC 800NBP20 CURRENT LIMITER FUSE 300-800A
WESTINGHOUSE DEUTERIUM LAMP TYPE WL 23838
WESTINGHOUSE DB-50 CURRENT SENSOR 400-600A STYLE 884A38H0 CONDITION
WESTINGHOUSE BST-OF SOLID STATE TIMER RELAY OFF-DELAY .-30 SEC. 20V
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WESTINGHOUSE BF80F INDUSTRIAL CONTROL RELAY 0A 300V 8 POLE 20V
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WESTINGHOUSE BF22F INDUSTRIAL CONTROL RELAY 0A 300V 4 POLE 20V COIL
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WESTINGHOUSE AK-2A-5 CURRENT SENSOR 225-00A STYLE 889A45H0 CONDITION
WESTINGHOUSE AF.2 OVERLOAD HEATER ELEMENT
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WESTINGHOUSE 8259A40H0 CURRENT TRANSFORMER 600:5 AMP RATIO 600V NOS
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WESTINGHOUSE 8259A38H0 CURRENT TRANSFORMER 200:5 AMP RATIO 600V NOS
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WESTINGHOUSE 400LAP0 CURRENT LIMITER STYLE 5680D75G04
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WESCHLER INSTRUMENTS 4B4XXAAWXXXXXX BARGRAPH
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WENGLOR MODEL FIS-0850-05 RASTER SCANNER
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WELKER BEARINGS WPA-24-48-90 SHOT PIN ASSEMBLY
WELKER BEARING WPA-40-23-A RIDGID SHOT PIN ASSEMBLY CONDITION
WEKSLER AA442PF4LWXX 4-/2" ROYAL GAUGE
WEIDMULLER WPE-70N/35 PE TERMINAL 70MM SCREW CONNECTION [SET OF 3]
WEIDMULLER WK2.5/U TERMINAL BLOCK 600V 24-2 AWG WIRE [SET OF 23]
WEIDMULLER WDU0 TERMINAL BLOCK ASSEMBLIES P/N 998785 (SET OF 6)
WEIDMULLER WDU-0 TERMINAL BLOCK 57A 000V AC/DC WDU0 [SET OF 50]
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