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
Komatsu 723-21-03700 Valve Asm
Hyster 1479749 Pump Steering
Detroit Diesel DDE RA9482600563 Shift Positioner
Kenworth 2195287PE Reactor, Decomp
Aftermarket AN241747 Structural Tube
Axletech 3202B7698 Axle Shaft Special Order
Komatsu 79713373 Pipe
Shur Co 1122948 Shur Co
Aftermarket N302260 Bracket
Mazda BAR367010E Harness Front
3638327 Oem Part, Guard Gp Oem Part for Caterpillar
Aftermarket 40121067 Control
5091463ZP Multi Media Radio for Chrysler
5091463ZM Multi Media Radio for Chrysler
5091463ZO Multi Media Radio for Chrysler
Case 2806680 Gear
Komatsu 209-60-53101 Valve Asm
1424412 Shaft for Caterpillar
Siemens 6FH9340-3BX88-O Card
Construction Equip. 0501-004-072 Caliper Asm for Hyundai
Terex 15051649 Caliper Asm
Replacement 1119770 1119770 for Caterpillar
Hitachi YJ00002326 Cylinder
Dana 217294 Dana Spicer Oil Sump
Pai 381186 Turbocharger Gray, With Gasket, For 3126 E Applica for Caterpillar
Hyster 1553526 Thermostat
Peterbilt P92JAEHAH000000000 Instrument Panel Wiring Harness
Aftermarket 9123068 Housing
Dana KF4047/3 Swivel Jaw
Minnpar Replacement M0964591 Cyl Cap
Terex 15265949 Gear
Skyline Emissions CJ0423-C Doc Kit Consisting Of 1 Doc, 2 Gaskets, And 2 Clamps
Pai 312601-017 Engine Hardware Kit For 3126 Application for Caterpillar
wws837033472 Tail Light Bracket for liner
Kobelco S19031-13044
Peterbilt 1854422PEX Pump Tandem Steering/Fuel 18
Aftermarket EPC048413 Lift Arm
Terex 15501903 Shaft Sun
Komatsu KD0-35730-0162 Rectifier Asm
Meritor A3111S3477 Steering Knuckle Right Hand (Rh) Side
Husqvarna 967872804 Vibrator Poker Smart 40 115 V / 1 Ph / 50/60 Hz
1115029 Harness Asm for Caterpillar
AE9Z7427407LA Panel Asy Door Trim for Ford
Vermeer 296328300 Rod Recycler 5.50 Fh Api P
Pow R Quik TAS85029 P/S Gear
Meritor A-3302E1045 Joint Double
PAI 060172E Cylinder Head Assembly
Mcneilus 1558GX1 Brake Drum
Liebherr American 9325867 Pin
Detroit Diesel RA9482600563 Shift Positioner
8211106830 Wire Engine Room Main for Toyota
International 2229059C3 Heater Rear Engine Wshld Defr
Hyundai Construction Equip. XKDE-00455 Motor Assy Start
Shyft Group Inc. 1786-KK1-001 Gear Steering Tas65 W/O R
5579409PX Injector Kit for Cummins
FC4Z4141B Carrier Differential for Ford
Case 89500433941 Converter
Komatsu 427-S95-A680 Switch, Pressure
Dana 2109406 Spindle
5290492 Bolt for Caterpillar
Aftermarket AH174596 Hydraulic Cylinder
Komatsu 423-01-H2260 Silencer
Fabtech FTS24267 Dirt Logic 2.5 Stainless Steel Resi Coil Over Shock Absorber;
Case 87253933 Mounting Parts
Dayton Parts DT-7-A Spring Road
Hyster 1692449 Kit Hose Internal Hose
4111535020 Air Brake Compressor for Wabco
8211104780 Wire Engine Room Main for Toyota
50200-S3V-030 Sub Frame, Fr. for Honda
Aftermarket 4214805 Wiring Harness
Pai 312601-021 Engine Hardware Kit For 3126 Series Applicatio for Caterpillar
Pai 312601-027 Engine Hardware Kit For 3126 Application for Caterpillar
Case 84552493 Motor Starter
Yale 580060589 Side Gate Linkage
Agco AG517542 Hydraulic Motor
Aftermarket 0010089597 Tube
Komatsu 90594740 Tube
Tci KDRL43LM0DV Line Reactor 690 V 675 A 0.050m H
Aftermarket AN261904 Structural Tube
Wacker Neuson Const Eq. 5000118635 Tank Hydraulic
Chelsea 489DFMAX-56XK Power Take (Pto) Direct Drive
Trp RF99963190 Control Panel Assy
Case 87389488 Harness Wire
Case 89500420509 Harness Wire
Horton 79A8124RMAN Fan Hub
Tadano America Corporation 94763294140 Pilot Control Lever
Tadano America Corporation 63294140 Pilot Control Lever
Hyster 1341676 Cylinder
Shyft Group Inc. 0896-FF1 Cooler Hyd Fluid
Paccar P92-5894-8Y1300090 Harness Chassis Main Ngp
4391515 Gasket for Caterpillar
Wirtgen Group 2436132 Pressure Relief Valve
AE9Z7427407HA Panel Asy Door Trim for Ford
Bendix K152939 Tabs6 Abs Modulator Abs Trailer Module, Service
Paccar A3713 Housing Clutch Kwp
Terex 501092-030 Roller Assy Superseded By 5115
Otc Tools Equipment 3824CBL-UPG Esi (Truck) Highway Upgrade Cable Kit
Aftermarket AT280858 Roller
4714461 * for Caterpillar
Agilent 86116B 4.4psec tr/80GHz Electrical 7.4 psec FWHM/65GHz Optical
RohdeSchwarz NPR-Z28 level control sensor 10MHz-18GHz, 200pW-100pW,
Anritsu MU181040A opt.002,030 (OPT-002 0.1 to 12.5Gbit/s)
National Instruments NI PXI 2796 40GHz Dual 6X1 50ohm Multiplexer
Tektronix CSA8200 Communications Signal Analyzer
Tektronix CSA8200 Communications Signal Analyzer
ST5540 LEAK CURRENT HITESTER
Keysight Agilent N1024A TDR Calibration Kit
Agilent 16196B Test Fixture 4287A Test Head
Keithley 2425 100W Sourcemeter
keithley 6485 Picoammeter
keithley 6485 Picoammeter
Keithley 2601A SYSTEM SourceMeter
Agilent N4010A Wireless Connectivity Test Set Opt 101,110,112,113,107
Polytec OFV-552 fiber vibrometer
Anritsu MT8852A Bluetooth Test Set
BK Bruel Kjaer UA 1404 4188 Outdoor MicrophKit
Maury Microwave 2750B DIN Calibration Kit 7-16
Anritsu MU181020A 12.5 Gbit/s PPG (OPT 002 0.1 to 12.5Gbit/s)
Agilent Keysight E9327A Peak and Average Power Sensor
Agilent E9326A Peak and Avg Power Sensor
SPIRENT STR4500 MULTI-CHANNEL GPS SIMULATOR
keysight N7551A ECal module DC 6.5GHz
Agilent DSO-X 2014A DSOX2014A Mixed Signal Oscilloscope 100MHz-2GSa/s
Spirent GSS6100 GPS/SBAS Signal Generator
ROHDE SCHWARZ SFC COMPACT MODULATOR
Tektronix TAP 1500 1.5GHz active probe 15Vpk max
Vintage Accelerometer(1966) Bruel Kjaer (BK) type 310
YEW 2755 Portable WheatstBridge
Keysight Agilent N4430A 4-port RF ECal Module 30 kHz to 6 GHz
Panasonic VP-8193A 100 kHz to 140 MHz AM / FM Stereo Signal Generator