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。
Techalloy ER80S-B2 Electrode 1/8in 36in 10lb
Liquid Solids Control C725404 Pcb Circuit Board
Square D FA-5264 Circuit Breaker 2p 15a Amp
Baldor 706364-51AA Brush Her
Rexnord 16106 126 Dbz Coupling Hub
Festo SOEL-RTD-Q50-PP-S-7L 537823 Diffuse Sensor
Federal Pacific VSDC Voltage Relay 250v-dc
Empire EWS-4369-E17 16pos M Plg/blt Cordset Cable Assembly 17ft
Fike POLY-SD CS Rupture Disc 134.25psi @350f 14in
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Ono Sokki MX-7110 Cordset Cable 10m
LD-80 Directed Light Fiber Optic Cable 5m
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Pgi PM-618SCG-VCH Intrument Manif 6000psi
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England 19120 Carbide Tipped Hammer Bit 11/16in
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Weed Fiber-optics D-0807 Electrical Interface Module
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Asco 158-506 Red-hat Spare Parts Kit
Sti 16170-0010 Pcb Circuit Board Rev C
Wenglor 201-734-608E2 Sensoric Glass Fiber Optic Cable
Fisher 1J5047X0022 Valve Gasket
Martin 1215 7/8in Bushing
Ckd 4KB419-00-LS-DC24V Pneumatic Solenoid Valve 24v-dc 0.7mpa
Fisher 1U286933272 Qo Valve Cage
Yaskawa JEPMC-PSA3012-E Power Supply 85-132/170-276v-ac 12a Amp 5/15v-dc
Norgren F12-300-A1PA Pneumatic Filter 3/8in Npt 150psi
Honeywell PX3650ITIC1 Pcb Circuit Board Rev E
Beckman 116-361-1 Motor Drive Assembly
Acrison PCU-4-17 Pcb Circuit Board
General Electric Ge L542-GBRX Ammeter 0-300dc Amp
Transmation 600A-18 Alarm Module 0-30mvdc 117v-ac
Asco 238514-335-D Solenoid Coil 125v-dc
Pneumatic Products 1200442 Valve Outlet Repair Kit
Acrison 403-4-260 Pcb Circuit Board
Rosemot Analytical 23555-00 Jction
Smc SY7340-5L0Z Pneumatic Solenoid Valve 24v-dc 0.7mpa
Blue Giant A12CH-4431BG#033-403 Hydraulic Conversion Kit 1600psi
Gws Tool Group STF 17707 End Mill
Foxboro N0300FZ Card Her Module
Eaton 64C1289H01 Pcb Circuit Board Rev 3
Anderson Greenwood M1VIS-4 028158571 Instrument Manif 6000psi
Kewaee 4-084-0-000-02-01 Cam Coupling Assembly
Chemstar 165R Compression Packing 3/8in 5lb
Dadco 90.10.0750.038TF Gas Spring Pneumatic Shock Absorber
Smc CDA2B50-150Z Double Acting Pneumatic Tie-rod Cylinder 50mm 145psi 150mm
Sti VS6530-0.25R Light Curtain Receiver
Chromalox AR-1025KC Temperature Controller 0-100f 277v-ac
Schneider 782XDXH21-120A Plug-in Relay 120v-ac
Bailey Serial Interface Module
Asco 8300A082F Red-hat Solenoid Valve 120v-ac 3/8in Npt
Ilshin 8Q05-FP Steel Socket Weld Y-ball Check Valve 2in 800
Ascon DX-5450-0000 Temperature Transmitter 24v-ac/dc
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Tufline 0366 2-way Stainless Socket Weld Plug Valve 1/2in 300
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Southeast Pump Specialist BLBW393496385-SPEC Ez-pac Pump Packing Kit
Skf SNW140 X 7.3/16 Adapter Sleeve 7-3/16in
Westinghouse 7379A21G0 Analog Input Pcb Circuit Board
Centerline 58 SERIES 200 Manual Iron Butterfly Valve 3in
Chesterton 050705 478-12/38M GL S 1.500 iversal Gland 1-1/2in
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Baldor P1861537 Ac Motor 182ty 3ph 3hp 1755rpm 230/460v-ac
Of 500 Fisher Scientific 14955180 Sterile Sampling Bags 5.5in X 9in
Foxboro 3A2-I2D Converter Pcb Circuit Board
Siemens 3NA3 254 Blade Fuse 355a Amp 500v-ac
Devar 18-152-2-M31 Resistance To Air Converter 3-27psi 117v-ac
Cutler Hammer C350KE23-63 Fuse Clip Kit
Sincron 11-SMB Right Angle Gear Reducer 25:1
Dodge 006587 1030t Coupling Hub 7/8in
Gardner Denver 8503304 Pinion Gear
Timken QF100XPB Quick Flex Coupling Hub
Forry 102054-03 Display Card Pcb Rev C
Moore FDT/F/1-5V/24DC Frequency To Dc Transmitter Module
Inmac 080001 Four Device 25-pin T-switch
Fisher 1J5047X0062 Valve Gasket
Schneider 2212-119-1 Thermostat 50-90f
Penn V47AA-3 Temperature Regulated Valve 75-135f 3/8in
John Crane D-9313-000-N540 Mechanical Seal
Tsuruga 482A-02-3-BP Digital Panel Meter
Panalarm 70-FP2 Flasher Board 12v-dc Rev 9
Square D FAL26000MV Med Case Circuit Breaker 2p 100a Amp 480v-ac
Fike SR-H BI Rupture Disc 48.63psi @ 300f 4in
Foxboro PR-13UBS-018-W Rtd 19in 1/4in
Na D/A 48-2 Pcb Circuit Board
Rosemot 00079-0335-0004 Rtd 9-3/4in
Honeywell C7035A1056 Uv Flame Detector
Novotechnik TLH 650 Linear Displacement Sensor
Elasto-valve Rubber Products RE65-SR-BE-OE Hose Flange 4in
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Dependable Power Systems 200500 Pcb Circuit Board Rev 3
Foxboro M/63R-OB-H Style B Alarm Relay 115v-ac 28v-dc
Yokogawa B9573SP-0 Power Assy Pcb Circuit Board
Ue ited Electric C11 102W Temperature Controller 0-225f 125/250v-ac
Fanuc Abu10a A03B-0819-C001 Chassis Module
Honeywell RMA300-SM-00-F1C3 Smart Meter 42v-dc
Foxboro 2DC-K Pcb Circuit Board
Reliance Electric 802820-119RB Reddency Processor Module
Burling B-2C Temperature Controller 250-500f 125/250/480v-ac
Beck 20-2901-06 Stall Protection Module
Jamesbury RKN81 TT 4in Valve Repair Kit
Of 5 Precision Brand 42465 Stainless Shim 4in X 4in 0.125 1-1/4in
Accu-sort Fing Mirror 36in
Gresen MHB-060-LEDH-16N-01 Dana Hydraulic Valve
Crydom M5060CC1200 HBC-103 Diode Module
Pack Of 10 Sandvik N151.3-500-40-7G Carbide Insert
Siemens 7ML11180CA40 XPS-15 Ultrasonic Level Transducer
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Arvin Diamond 511920-1043 Interface Pcb Circuit Board Rev D
Anderson 13523 TS3 Wire Wheel 3in
Panasonic AZ46049 Limit Switch 250v-ac
Fuji B32SAM-3P010 Med Case Circuit Breaker 3p 10a Amp 230/400v-ac
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Yachiyo MR 12MN SU1 V0N-230L Linear Guide
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Allen Bradley 1771-OAD 12-120vac Output Module
Allen Bradley 1771-OAD 12-120vac Output Module
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