福建中立恒自动化设备有限公司
一、摘要 PLC是一种专门在工业环境下应用而设计的数字运算操作的电子装置。
它采用可以编制程序的存储器,用来在其内部存储执行逻辑运算、顺序运算、计时、计数和算术运算等操作的指令,并能通过数字式或模拟式的输入和输出,控制各种类型的机械或生产过程。PLC及其有关的外围设备都应按照易于与工业控制系统形成一个整体,易于扩展其功能的原则而设计。在工业生产的各个领域,机械加工企业为了提高生产效率,采用机械化流水作业的方式,对不同类型的零件分别组成的自动生产线。随着产品机型的更新换代,生产线承担的加工对象也随之改变,这就需要改变控制程序,使生产线的机械设备按新的工艺过程运行,而继电接触器控制器系统是采用固定接线,很难适应这个要求。大型自动生产线的控制系统使用的继电器数量很多,随着PLC的应用日益普及,其使用方法简单,便于掌握,且可靠性,抗干扰性很强,自身具有完善的功能.模块化的结构,使其在工业生产线上的应用越来越广泛。
发展趋势:1.向高速度、大容量方向发展
为了提高PLC的处理能力,要求PLC具有的响应速度和更大的存储容量。目前,有的PLC的扫描速度可达0.1ms/k步左右。PLC的扫描速度已成为很重要的一个性能指标。
在存储容量方面,有的PLC可达几十兆字节。为了扩大存储容量,有的公司已使用了磁泡存储器或硬盘。
2.向超大型、超小型两个方向发展
当前中小型PLC比较多,为了适应市场的多种需要,今后PLC要向多品种方向发展,特别是向超大型和超小型两个方向发展。现已有I/O点数达14336点的超大型PLC,其使用32位微处理器,多CPU并行工作和大容量存储器,功能强。
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BOSCH POWER SUPPLY PCB MODULE
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BOSCH REXROTH B-830-303-075 PC BOARD B830303075
BOSCH REXROTH B-830-303-075 PC BOARD B830303075
BOSCH REXROTH B-830-303-075 PC BOARD B830303075
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BOSCH WK0710 F01U028279 F17 PCB BOARD
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BOURNS 6574M-549-202X3 POTENTIOMETER WITH KAMEWA GT1DS PITCH TRANSMITTER PCB
BOURNS 6574M-549-202X3 POTENTIOMETER WITH KAMEWA GT1DS PITCH TRANSMITTER PCB
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BRANDNER SR 340 PCB CARD 15V/8A
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BRAUN GMBH E1667.211 POWER SUPPLY CARD D-71334 E1667211
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BRITTAIN 1D702-0008 PC BOARD 1D7020008
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BROOKS INSTRUMENT S-097-Y-509-AA-A POWER SUPPLY BOARD S097Y509AAA
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BRUNNER ELEKTRONIK PRT0075V0020554 PC BOARD
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BSU-7 BREAK SWITCH UNIT REV.1.4
BSU-7 BREAK SWITCH UNIT REV.1.4
BSU-7 BREAK SWITCH UNIT REV.1.4
BSU-7 BREAK SWITCH UNIT REV.1.4
BUR CP3S/4 CIRCUIT BOARD CP3S4
BUR CP3S/4 CIRCUIT BOARD CP3S4
BUR E116/7 CIRCUIT BOARD MCE16A-0 E1167
BUR E116/7 CIRCUIT BOARD MCE16A-0 E1167
BUR PEA4/2 CIRCUIT BOARD MCPEAB-1 PEA42
BUR PEA4/2 CIRCUIT BOARD MCPEAB-1 PEA42
BV INDUSTRIETECHNIK SIMPLEX COMPACT FIN STABILISER CONTROL S-PANEL V1.3
BV INDUSTRIETECHNIK SIMPLEX COMPACT FIN STABILISER CONTROL S-PANEL V1.3
BW TECHNOLOGIES RRJ-RW1 LEL TRANSMITTER WITH SENSOR 119630
BW TECHNOLOGIES RRJ-RW1 LEL TRANSMITTER WITH SENSOR 119630
BW TECHNOLOGIES RRJ-RW1 LEL TRANSMITTER WITH SENSOR 119630
BW TECHNOLOGIES RRJ-RW1 LEL TRANSMITTER WITH SENSOR 119630
C & D BATTERIES MBC-1950 PC BOARD MBC1950
C & D BATTERIES MBC-1950 PC BOARD MBC1950
C&D MBC-4766-130H-E PC BOARD MBC4766130HE MBC-4766
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C&S D5688 LED BULB PCB
C100006 BTI CONTROLLER BOARD H-PD
C100006 BTI CONTROLLER BOARD H-PD
C-186 BOARD CPC186 REV A3
C-186 BOARD CPC186 REV A3
C-186 BOARD CPC186 REV A3
C-186 BOARD CPC186 REV A3
CABUR XCAPIPO3 PROGRAMMABLE ANALOG SIGNAL CONVERTER
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CABUR XCAPIPO3 PROGRAMMABLE ANALOG SIGNAL CONVERTER
CABUR XCAPIPO3 PROGRAMMABLE ANALOG SIGNAL CONVERTER
CAE ELECTRONICS 188521-01-2-268 CIRCUIT CARD 188521012268
CAE ELECTRONICS 188521-01-2-268 CIRCUIT CARD 188521012268
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CAE ELECTRONICS MA115534.01.2.268 PC BOARD 35181 MA11553401
CAE ELECTRONICS MA115534.01.2.268 PC BOARD 35181 MA11553401
CAE ELECTRONICS MA115536.03 PC BOARD 35181 MA11553603
CAE ELECTRONICS MA115536.03 PC BOARD 35181 MA11553603
CAE ELECTRONICS MA14052-01 CIRCUIT CARD ASSEMBLY 141052-01
CAE ELECTRONICS MA14052-01 CIRCUIT CARD ASSEMBLY 141052-01
CAE ELECTRONICS MA8724.01.2.268 PC BOARD 8724012268
CAE ELECTRONICS MA8724.01.2.268 PC BOARD 8724012268
CAMBION DS-707-1114 PC BOARD DS7071114
CAMBION DS-707-1114 PC BOARD DS7071114
CAMBION DS-707-1114 PC BOARD DS7071114
CAMBION DS-707-1114 PC BOARD DS7071114
CAMBION DS-707-1114 PC BOARD DS7071114
CAMBION DS-707-1114 PC BOARD DS7071114
CAMBION DS-707-1114 PC BOARD DS7071114
CAMBION DS-707-1114 PC BOARD DS7071114
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON 2821-130 PC BOARD 2821130
CAMERON CONTROLS 619095 BOARD PEC PBADS30 PCB
CAMERON CONTROLS 619095 BOARD PEC PBADS30 PCB
CAMERON LTF MODEM 619095-13-13-01 PCB CARD REV.07
CAMERON LTF MODEM 619095-13-13-01 PCB CARD REV.07
CAN-TRON ET4 90040209 REV. D PATTERN CONTROL BOARD
CAN-TRON ET4 90040209 REV. D PATTERN CONTROL BOARD
CAN-TRON ET4 90040209 REV. D PATTERN CONTROL BOARD
CAN-TRON ET4 90040209 REV. D PATTERN CONTROL BOARD
CAPITOL CONTROLS R1975 RESIDUAL CONTROLLER PC BOARD
CAPITOL CONTROLS R1975 RESIDUAL CONTROLLER PC BOARD
CAPITOL CONTROLS R1975 RESIDUAL CONTROLLER PC BOARD
CAPITOL CONTROLS R1975 RESIDUAL CONTROLLER PC BOARD
CAPITOL CONTROLS R1975 RESIDUAL CONTROLLER PC BOARD
CARDKEY 31-0806-02 CARD READER SECURITY SYSTEM 31080602
CARDKEY 31-0806-02 CARD READER SECURITY SYSTEM 31080602
CARDKEY 31-0806-02 CARD READER SECURITY SYSTEM 31080602
CARDKEY 31-0806-02 CARD READER SECURITY SYSTEM 31080602
CARL SCHENCK BEAV005 PC BOARD
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