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。
WESTINGHOUSE 7379A21G03 CIRCUIT BOARD
WESTINGHOUSE 7379A31G0 CIRCUIT BOARD 7QAW V3794
WESTINGHOUSE 7379A31G0 CIRCUIT BOARD 7QAW V3794
WESTINGHOUSE 7379A31G03 CIRCUIT BOARD 7QAW3
WESTINGHOUSE 7379A31G03 CIRCUIT BOARD 7QAW3
WESTINGHOUSE 7379A31G04 CIRCUIT BOARD 7379A317QAW
WESTINGHOUSE 7379A31G04 CIRCUIT BOARD 7379A317QAW
WESTINGHOUSE 7379A31G04 CIRCUIT BOARD 7379A317QAW
WESTINGHOUSE 7379A31G04 CIRCUIT BOARD 7379A317QAW
WESTINGHOUSE 7379A31G04 CIRCUIT BOARD 7QAW11
WESTINGHOUSE 7379A31G04 CIRCUIT BOARD 7QAW11
WESTINGHOUSE 7379A31G04 CIRCUIT BOARD 7QAW11
WESTINGHOUSE 7379A31G04 CIRCUIT BOARD 7QAW11
WESTINGHOUSE 7379A31G05 ANALOG INPUT BOARD 7QAW5
WESTINGHOUSE 7379A31G05 ANALOG INPUT BOARD 7QAW5
WESTINGHOUSE 7379A62G02 ANALOG INPUT CARD 2QRT10
WESTINGHOUSE 7379A62G02 ANALOG INPUT CARD 2QRT10
WESTINGHOUSE 7379A62G02 CIRCUIT BOARD
WESTINGHOUSE 7379A62G02 CIRCUIT BOARD
WESTINGHOUSE 7379A84G01 BUS EXTENDER CARD 3QBE5
WESTINGHOUSE 7379A84G01 BUS EXTENDER CARD 3QBE5
WESTINGHOUSE 7379A84G01 BUS EXTENDER CARD 4QBE3
WESTINGHOUSE 7379A84G01 BUS EXTENDER CARD 4QBE3
WESTINGHOUSE 7379A89G01 CIRCUIT BOARD 4MBU8
WESTINGHOUSE 7379A89G01 CIRCUIT BOARD 4MBU8
WESTINGHOUSE 7379A91-2QAA DRIVER BOARD 7380A67G0 2DBK2 7379A91G02
WESTINGHOUSE 7380A37G01 CIRCUIT BOARD
WESTINGHOUSE 7380A37G01 CIRCUIT BOARD
WESTINGHOUSE 7380A72G01 CONTROL BOARD 7380A72
WESTINGHOUSE 7380A72G01 CONTROL BOARD 7380A72
WESTINGHOUSE 7380A92G02 CIRCUIT BOARD 1DRE
WESTINGHOUSE 7380A92G02 CIRCUIT BOARD 1DRE
WESTINGHOUSE 7380A92G03 INPUT AMPLIFIER CARD 3DRE3 REV C
WESTINGHOUSE 7381A01-G0 CIRCUIT BOARD 7381A01G0 MSBX-900
WESTINGHOUSE 7381A01G04 CIRCUIT BOARD 772B388G56
WESTINGHOUSE 7381A01G04 CIRCUIT BOARD 772B388G56
WESTINGHOUSE 7381A06G02 CIRCUIT BOARD 3MUA9
WESTINGHOUSE 7381A06G02 CIRCUIT BOARD 3MUA9
WESTINGHOUSE 7381A46G01 CIRCUIT BOARD 2MVAQ1
WESTINGHOUSE 7381A46G01 CIRCUIT BOARD 2MVAQ1
WESTINGHOUSE 7381A81G01 CIRCUIT BOARD 5MDM4
WESTINGHOUSE 7381A81G01 CIRCUIT BOARD 5MDM4
WESTINGHOUSE 7381A83G02 CIRCUIT BOARD 4MSE12
WESTINGHOUSE 7381A83G02 CIRCUIT BOARD 4MSE12
WESTINGHOUSE 7381A83G02 DPU MEMORY BOARD 4MSE10 REV. F
WESTINGHOUSE 7381A93G01 CIRCUIT BOARD PCPR 2-0 7381A93-G03
WESTINGHOUSE 7381A93-G03 CIRCUIT BOARD 7381A93G03
WESTINGHOUSE 7381A93-G03 CIRCUIT BOARD 7381A93G03
WESTINGHOUSE 7381A93G03 CIRCUIT BOARD 7MHC18
WESTINGHOUSE 7381A93G03 CIRCUIT BOARD 7MHC18
WESTINGHOUSE 7381A93G03 CIRCUIT BOARD 7MHC9
WESTINGHOUSE 7381A93G03 CIRCUIT BOARD 7MHC9
WESTINGHOUSE 7381A93G03 PC BOARD MHC HIGHWAY CONTROL 7381A93G03
WESTINGHOUSE 7381A93H07 7MHC PC BOARD
WESTINGHOUSE 7381A93H07 7MHC PC BOARD
WESTINGHOUSE 772B388G29 CIRCUIT BOARD 7381A01G0
WESTINGHOUSE 772B388G29 CIRCUIT BOARD 7381A01G0
WESTINGHOUSE 772B388G29 CIRCUIT BOARD 7381A01G03
WESTINGHOUSE 772B388G29 CIRCUIT BOARD 7381A01G03
WESTINGHOUSE 772B388G29 CIRCUIT BOARD REV 41 7381A01G03
WESTINGHOUSE 772B388-G57 CIRCUIT BOARD 7381A01 772B388G57
WESTINGHOUSE 772B388G59 CIRCUIT BOARD 7381A01G06
WESTINGHOUSE 772B388G59 CIRCUIT BOARD 7381A01G06
WESTINGHOUSE 772B388G59 CIRCUIT BOARD 7381A01G06
WESTINGHOUSE 772B388G59 CIRCUIT BOARD 7381A01G06
WESTINGHOUSE HAGAN 398828 RELAY CARD
WESTINGHOUSE HAGAN 398828 RELAY CARD
WESTMATIK 1360 D-101 NESBRU PCB CARD 201 A
WESTMATIK 1360 D-101 NESBRU PCB CARD 201 A
WESTRONICS ADC MUX CB100158-01 PC BOARD CB10015801
WESTRONICS CB100188-01 CPU BOARD MC100188-01 REV A CB10018801
WESTRONICS W60223-A PCB BOARD W60223A
WESTRONICS W60223-A PCB BOARD W60223A
Wilson Walton CF-CCB-301 PCB Card NEW
Wilson Walton CF-CCB-301 PCB Card NEW
Wilson Walton CF-CCB-301 PCB Card NEW
Wilson Walton CF-CCB-301 PCB Card NEW
Wilson Walton CF-CCB-301 PCB Card NEW
Wilson Walton CF-CCB-301 PCB Card NEW
WINSYSTEMS G400-0351-000E CIRCUIT BOARD G4000351000E
WMG02_MR7 02409 PCB CARD
WMG02_MR7 02409 PCB CARD
WMTLAB-059C PCB CARD
WMTLAB-059C PCB CARD
WOO SUNG PCB CARD BORD II / FAST BY DHL OR FEDEX
WOODHEAD 5136-PFB-VME PROFIBUS INTERFACE CARD REV. 1.2.7 5136PFBVME
WOODHEAD D14689A PC BOARD RAI DMS
WOODHEAD D14689A PC BOARD RAI DMS
WOODMAN 609-068 PC BOARD 609068, D14622A, REPAIRED
WOODMAN 609-087 PC CONTROL BOARD 609087
WOODMAN 609-087 PC CONTROL BOARD 609087
WOODMAN 609-087 PC CONTROL BOARD 609087
WOODMAN 609-087 PC CONTROL BOARD 609087
WOODMAN A14058 CONVERTER BOARD REV. C, D15011 REV. E
WOODMAN A-14058A CONVERTER BOARD REV. C, A14058A
WOODMAN A-14058A CONVERTER BOARD REV. C, A14058A
WOODMAN A-14058A CONVERTER BOARD REV. D, A14058A , D15011 REV. E