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。
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Fisher 10A8939X0A2 Level Adjustment Assembly
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Moore Industries SPA2/HLPRG/2PRG/U/-AO(DIN) Programmable Trip Alarm
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Flowserve 5966699QEBW80T3 Manual Stainless Ball Valve 2in 1500
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Superlogics SL-PPC-12A-LLH310TN-S17 SL-LCD-12A-RTOUCH-1 Touchscreen 12v-dc
Mitsubishi SC-J2SCPJ4CSET-01 Servo Conversion Cable
Branson 2000T Ultrasonic Welder Power Supply 200-240v-ac 400w
Bri SC-1AS-8 Magnetic Screw Conveyor Winding
Eaton MBB150BTSG Meter Breaker 3p 150a Amp 120/240v-ac
Rosemot 2088G2S22A1I1 288 Smart 0-150psi 10.5-36v-dc Pressure Transmitter
Numatics F1FR-06A1D-DAA0 Double Acting Pneumatic Cylinder 4in 6in 250psi
Ctc ALS-1832 Access 4000 Switch Module 120/240v-ac
Cem AVC 80 Microwave Moisture Solids Analyzer
Allen Bradley 20-750-BUS3-F8 Powerflex 750 Ac Output Termination Kit
Fanuc A06B-0127-B588-R Servo Motor 3ph 1kw 2000rpm 6nm 149v-ac
Rosemot 3144PD1A2K6M5U2 Temperature Transmitter -327.99-1561.99f 12-42.4v-dc
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Rosemot 3144PD1A1NAB4 Temperature Transmitter 0-100c
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Allen Bradley 2090-CPBM4E2-14TR Power Brake Transition Cable
Hoffman ADB275 Rack Motable Blower Fan 115v-ac
Kanata K8425-2 Swivel Mechanism W/ Bearing Kit 1000lb
Okuma BL-MC150J-20SB Servo Motor 3ph 3kw 2000rpm 16.2nm 133v-ac
Joslyn TK-ST160-600NN-N Servicetrack St Surge Suppressor Device 600v-ac
Beko RA 15 NA P 4011245 Refrigerated Air Dryer 15scfm 60-230psi 115v-ac
Pulsafeeder 680-S-E Pulsa Pro Metering Pump 0.62gph 150psi 115/208-230v-dc
Browning 8S5V160 V-belt Sheave 4-1/8in 8 Groove
Standard Xchange HCF SN503100326600 Brass Shell Copper Tube Heat Exchanger
Rexroth 5WRPE 10 F1B 70L-20/G24K0/A1M Hydraulic Servo Valve 24v-dc
Dynaflow C50S0128B2 Pump Cartridge Seal
Fanuc A06B-6117-H211 Servo Amplifier 283-339v-dc 240v-ac 13kw
Yokogawa DS600-00-1W Ds600 Data Adqusition Sub it
Abb A210P-20-11-84 Precipitator Contactor 110-120v-ac 300a Amp
Mettler Toledo IND560 Operator Interface Panel 100-240v-ac
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Cutler Hammer JD3100 Jt3100t Med Case Circuit Breaker 3p 100a Amp 600v-ac
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Robertshaw I-1284-D20 Bronze Flanged Thermostatic Temperature Valve 3in
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