福建中立恒自动化设备有限公司
目前,世界上有200多个厂家生产可编程序控制器产品,厂家有德国的西门子,美国的Rockwell(AB)、通用(GE),日本的三菱、欧姆龙,法国的施耐德等。
可编程序控制器总的发展趋势是向高集成度、小体积、大容量、高速度、易使用、高性能方向发展。具体表现在以下几个方面:
(1)向小型化、专用化、低成本方向发展
20世纪80年代初,小型PLC在价格上还高于小系统用的继电器控制装置。随着微电子技术的发展,新型器件大幅度的提高功能和降低价格,使PLC结构更为紧凑,功能不断增加,将原来大、中型PLC才有的功能移植到小型PLC上,如模拟量处理、数据通讯和复杂的功能指令等,但价格不断下降,真正成为继电器控制系统的替代产品。
(2)向大容量,高速度方向发展
大型PLC采用多微处理器系统,有的采用32位微处理器,可同时进行多任务操作,处理速度提高,特别是增强了过程控制和数据处理的功能。另外,存储容量大大增加。
(3)与计算机联系密切
从功能上看,PLC不仅能完成逻辑运算,且计算机的复杂运算功能在PLC中也进一步得到利用,从结构上看,计算机的硬件和技术越来越多地应用到PLC;从语言上看,PLC己不再是单纯用梯形图语言,而且可用多种语言编程,如类似计算机汇编语言的语句表,甚至可直接由计算机语言编程;在通讯方面,PLC与计算机可直接相连并进行信息传递。
(4)发展多样化
可编程序控制器发展的多样化体现在3个方面:产品类型、编程语言和应用领域。
(5)模块化
PLC的扩展模块发展迅速。功能明确化、专用化的复杂功能由专门模块来完成。主机仅仅通过通讯设备向模块发布命令和测试状态,这使得PLC的系统功能进一步增强,控制系统设计进一步简化。
(6)网络与通讯能力增强
计算机与PLC之间以及各个PLC之间的联网和通讯的能力不断增强,使用工业网络可以有效地节省资源、降低成本、提高系统可靠性和灵活性,致使网络的应用有普遍化的趋势。
(7)多样化与标准化
生产PLC产品的各厂家都在大力度地开发自己的新产品,以求占据市场的更大份额。因此产品向多样化方向发展,出现了欧、美、日多种流派。与此同时,为了推动技术标准化的进程。一些国际性组织,如国际电工委员会(IEC)不断为PLC的发展制定一些新的标准,如对各种类型的产品作一定的归纳或定义,或对PLC未来的发展制定一种方向或框架。
(8)工业软件发展迅速
与可编程序控制器硬件技术的发展相适应,工业软件的发展非常迅速,它使系统应用更加简单易行,大大方便了PLC系统的开发人员和操作使用人员。
可编程序控制器的输出信号类型可以是开关量、模拟量和数字量。输出单元从广义上分包含两部分:一是与被控设备相连接的接口电路,另一部分是输出的映像寄存器。
PLC运行时CPU从输入映像寄存器读取输入信息并进行处理,将处理结果放到输出映像寄存器。输出映像寄存器由输出点相对应的触发器组成,输出接口电路将其由弱电控制信号转换成现场需要的强电信号输出,以驱动电磁阀、接触器、指示灯等被控设备的执行元件。
以下链接皆有货
HP 5063-0023 50630023 A-3139-45 A313945 Board for HP 4396A
HP 5063-0023 50630023 A-3139-45 A313945 Board for HP 4396A
HP 5063-3469 40W/20W Board
HP 5063-3469 40W/20W Board
HP 5184-0019 5064-798B D8520-68002 Motherboard
HP 5184-0019 5064-798B D8520-68002 Motherboard
HP 5185-0178 Board for HP Procurve Switch 41046/J4887A
HP 5185-0178 Board for HP Procurve Switch 41046/J4887A
HP 6633A System DC Power Supply w/ Breakage Side
HP 6633A System DC Power Supply w/ Breakage Side
HP 700200-001 NFS300-7630 700200001 NFS3007630 Power Supply
HP 700200-001 NFS300-7630 700200001 NFS3007630 Power Supply
HP 82000 E1222-66503 E122266503 PMU Board
HP 82000 E1222-66503 E122266503 PMU Board
HP 8590L 9kHz-1.8GHz Spectrum Analyzer
HP 8590L 9kHz-1.8GHz Spectrum Analyzer
HP 8664A parts 08645-60226 A-2753-10 Board
HP 8664A parts 08645-60226 A-2753-10 Board
HP 88809L 03235-66502 Board
HP 88809L 03235-66502 Board
HP A6961-80201 A6961-60201 PCB REV A5 Server Board
HP A6961-80201 A6961-60201 PCB REV A5 Server Board
HP AF616A 513735-001 Server Console
HP AF616A 513735-001 Server Console
HP Agilent 03772-60002 0377260002 Board
HP Agilent 03772-60002 0377260002 Board
HP Agilent 03852-66522 0000008754 Module for HP 3852A
HP Agilent 03852-66522 0000008754 Module for HP 3852A
HP Agilent 04396-66511 0439666511 Board
HP Agilent 04396-66511 0439666511 Board
HP Agilent 05890-60970 0589060970 Transformer
HP Agilent 05890-60970 0589060970 Transformer
HP Agilent 06011-60023 0601160023 Circuit Board
HP Agilent 06011-60023 0601160023 Circuit Board
HP Agilent 06011-60023-36-200644-00469 Board
HP Agilent 06011-60023-36-200644-00469 Board
HP Agilent 06032-60028-36-200642-00617 Circuit Board
HP Agilent 06032-60028-36-200642-00617 Circuit Board
HP Agilent 06033-60020 0603360020 PC-P-86-94V0 Display Board
HP Agilent 06033-60020 0603360020 PC-P-86-94V0 Display Board
HP Agilent 06671-60024 0667160024 Power Supply Board
HP Agilent 06671-60024 0667160024 Power Supply Board
HP Agilent 06672-60020 0667260020 Board
HP Agilent 06672-60020 0667260020 Board
HP Agilent 06672-60020 0667260020 Circuit Board
HP Agilent 06672-60020 0667260020 Circuit Board
HP Agilent 06672-61020 0667261020 Board
HP Agilent 06672-61020 0667261020 Board
HP Agilent 0667-60024 066760024 Board
HP Agilent 0667-60024 066760024 Board
HP Agilent 08753-60095 B-3126-45 Digital IF
HP Agilent 08753-60095 B-3126-45 Digital IF
HP Agilent 08922-60141 0892260141 Board
HP Agilent 08922-60141 0892260141 Board
HP Agilent 08924-60212 A-546-10 Board
HP Agilent 08924-60212 A-546-10 Board
HP Agilent 0950-2779 09502779 Power Supply
HP Agilent 0950-2779 09502779 Power Supply
HP Agilent 1663C 34-Channel Logic Analyzer S/N:US37420102
HP Agilent 1663C 34-Channel Logic Analyzer S/N:US37420102
HP Agilent 1663C Logic Analyzer w/ Missing Front Cover
HP Agilent 1663C Logic Analyzer w/ Missing Front Cover
HP Agilent 33120A 15 MHz Function/Arbitrary Waveform Generator
HP Agilent 33120A 15 MHz Function/Arbitrary Waveform Generator
HP Agilent 33120A 15MHz Function / Arbitrary Waveform Generator
HP Agilent 33120A 15MHz Function / Arbitrary Waveform Generator
HP Agilent 3312A Function Generator w/ Scratches & Missing Button As Is
HP Agilent 3312A Function Generator w/ Scratches & Missing Button As Is
HP Agilent 3336A Synthesizer/Level Generator As Is 3 Business
HP Agilent 3336A Synthesizer/Level Generator As Is 3 Business
HP Agilent 34933A Switch Module w/ E6170-26518 for 34980A
HP Agilent 34933A Switch Module w/ E6170-26518 for 34980A
HP Agilent 34933A Switch Module w/ E6170-26518 w/ Breakage for 34980A
HP Agilent 34933A Switch Module w/ E6170-26518 w/ Breakage for 34980A
HP Agilent 34933A Switch Module w/ E6170-26519 for HP 34980A
HP Agilent 34933A Switch Module w/ E6170-26519 for HP 34980A
HP Agilent 34970A Data Acquisition/Switch Unit AS IS
HP Agilent 34970A Data Acquisition/Switch Unit AS IS
HP Agilent 37721A Digital Transmission Analyzer
HP Agilent 37721A Digital Transmission Analyzer
HP Agilent 37721A Digital Transmission Analyzer w/o Cover DEFECTIVE
HP Agilent 37721A Digital Transmission Analyzer w/o Cover DEFECTIVE
HP Agilent 37730A Frame Analyzer
HP Agilent 37730A Frame Analyzer
HP Agilent 3852PS 03852-66512 Power Supply for HP 3852A
HP Agilent 3852PS 03852-66512 Power Supply for HP 3852A
HP Agilent 3852X Controller Interface for HP 3852A
HP Agilent 3852X Controller Interface for HP 3852A
HP Agilent 4141B DC Source / Monitor
HP Agilent 4141B DC Source / Monitor
HP Agilent 436A Power Meter w/ Breakage
HP Agilent 436A Power Meter w/ Breakage
HP Agilent 438A Dual Sensor Power Meter 100-120V/220-240VAC w/ Errors
HP Agilent 438A Dual Sensor Power Meter 100-120V/220-240VAC w/ Errors
HP Agilent 438A Power Meter SN:2649U00546
HP Agilent 438A Power Meter SN:2649U00546
HP Agilent 4934A TIMS No Display
HP Agilent 4934A TIMS No Display
HP Agilent 5020-8478-A1 50208478A1 Board
HP Agilent 5020-8478-A1 50208478A1 Board
HP Agilent 5060-3303 Board
HP Agilent 5060-3303 Board
HP Agilent 5060-3305 50603305 Board
HP Agilent 5060-3305 50603305 Board
HP Agilent 5060-3365 50603365 Circuit Board w/ Heat Sink
HP Agilent 5060-3365 50603365 Circuit Board w/ Heat Sink
HP Agilent 5060-3366 50603366 Board
HP Agilent 5060-3366 50603366 Board
HP Agilent 5060-3401 Board
HP Agilent 5060-3401 Board
HP Agilent 5063-4823-3908-93-200209-00040 5063482339089320020 Circuit Board
HP Agilent 5063-4823-3908-93-200209-00040 5063482339089320020 Circuit Board
HP Agilent 5087-7004 50877004 RF Out Sampler
HP Agilent 5087-7004 50877004 RF Out Sampler
HP Agilent 54120B Digitizing Oscilloscope Mainframe Missing Stand
HP Agilent 54120B Digitizing Oscilloscope Mainframe Missing Stand
HP Agilent 54501A 100MHz Digitizing Oscilloscope
HP Agilent 54501A 100MHz Digitizing Oscilloscope
HP Agilent 54600A Oscilloscope 100 MHz 2 Channel
HP Agilent 54600A Oscilloscope 100 MHz 2 Channel
HP Agilent 54600B Oscilloscope 100MHz w/ Breakage AS IS
HP Agilent 54600B Oscilloscope 100MHz w/ Breakage AS IS
HP Agilent 54600B Oscilloscope LOW READING w/ Breakage Made in USA As Is
HP Agilent 54600B Oscilloscope LOW READING w/ Breakage Made in USA As Is
HP Agilent 54610A Oscilloscope 2-Channel 500MHz
HP Agilent 54610A Oscilloscope 2-Channel 500MHz
HP Agilent 54610B Oscilloscope Made in USA As Is
HP Agilent 54610B Oscilloscope Made in USA As Is
HP Agilent 54622A 2CH 100MHZ Digitizing Oscilloscope w/ Breakage AS IS
HP Agilent 54622A 2CH 100MHZ Digitizing Oscilloscope w/ Breakage AS IS
HP Agilent 54624A 4CH Oscilloscope 100MHz 200 Msa/s w/ Breakage Made in Malaysia
HP Agilent 54624A 4CH Oscilloscope 100MHz 200 Msa/s w/ Breakage Made in Malaysia
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