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。

E4S 72 VOLTS 6 PACK (for GLOBAL ELECTRIC MOTORCARS)

ELXD 72 VOLTS 6 PACK (for GLOBAL ELECTRIC MOTORCARS)

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T145-8-PACK (for TROJAN)

BIO ALL PUPIL (for KEELER)

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CIQ100 (for FLUKE)

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UV 90ENON (for PHARMACIA / LKB)

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UV400 (for SPECTROLINE)

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33 IN 36 VOLTS 3 PACK (for TORNADO INDUSTRIES)

CHARIOT 3 ISCRUB 26 36 VOLTS 3 PACK (for WINDSOR INDUSTRIES)

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4120119 (for EZGO / CUSHMAN / TEXTRON)

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ENCORE S2426 24 VOLTS 4 PACK (for CLARKE INDUSTRIES)

SC750 REV 24 VOLTS 4 PACK (for NILFISK-ADVANCE)

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SC750 ST 26D 24 VOLTS 4 PACK (for NILFISK-ADVANCE)

B 80 W BP 24 VOLTS 4 PACK (for KARCHER)

2502-083 (for EZGO / CUSHMAN / TEXTRON)

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T1275 PLUS 4 PACK (for TROJAN)

TITAG-500 DUAL LAMP VERSION (for DIGITAL PRISM)

001-742 (for BATTERIES AND LIGHT BULBS)

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CHARIOT ISCRUB 26 36 VOLTS 3 PACK (for WINDSOR INDUSTRIES) and

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635779 (for EZGO / CUSHMAN / TEXTRON)

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B5 36 VOLTS 3 PACK (for TENNANT)

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Replacement foA-101 (for WELCH ALLYN)

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 LISTING10 MSP 24 VOLTS 4 PACK (for JLG INDUSTRIES)

U112RJ (for VALENCE)

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Replacement fo8000RR LAMP AND MODULE (for STRYKER)

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A98L00310026 (for GE FANUC)

A02B0309K102 (for GE FANUC)

10427 (for CABLES AND SENSORS)

US1256PACK (for US BATTERY)

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SAH250 (for PHILIPS)

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CL1857 LAMP AND MODULE (for LUXTEL)

SYC0300 LAMP AND MODULE (for SUNOPTICS)

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10422 (for CABLES AND SENSORS)

SAH250B (for LIGHT BULB / LAMP)

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 LISTING(25) AMERICAN ULTRAVIOLET 05-0716

90125 (for INTEGRA)

 LISTINGJ185H-AC-3-PACK (for TROJAN)

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US12 (for US BATTERY)

 LISTINGJ305E-AC-4-PACK (for TROJAN)

SJIII321924VOLTS4PACK (for SKYJACK)

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PULSEENON LAMP

US8VGC6PACK (for US BATTERY)

1  US8VGC6PACK (for US BATTERY)

8VPRECEDENTCARGOELECTRICGOLFCARTBATTERY6PACK (for CLUB CAR) and

CLUB CAR 8V LIMITED EDITION SPORT CLASS S910 LX GOLF CART BATTERY 6 PACK

FAIRPLAY 8V UTILITY HOSS 48V GOLF CART BATTERY 6 PACK

SLIGC8V6PACK (for BATTERIES AND LIGHT BULBS)

MPB045VGN24T2746 BATTERIES (for YALE)

12NXS137 (for NEXSYS)

10448460 LAMP (for LEICA)

GR2024VOLTS4PACK (for GENIE INDUSTRIES)

10423 (for CABLES AND SENSORS)

10424 (for CABLES AND SENSORS)

 LISTING(24) AMERICAN ULTRAVIOLET 05-0716

(12) UVA340 (for Q-LAB)