PLC作用:
PLC是多數(shù)工業(yè)控制和工廠自動(dòng)化系統(tǒng)的核心組成部分,通常被稱為工廠的“大腦",PLC 通過接收和處理來自傳感器和機(jī)器的數(shù)據(jù)來實(shí)現(xiàn)廣泛的功能,然后使用這些數(shù)據(jù)來控制和制動(dòng)外部設(shè)備。除此之外,成功的設(shè)計(jì)必須具備可靠性、系統(tǒng)穩(wěn)定性以及與連接的自動(dòng)化系統(tǒng)的互操作性。
現(xiàn)在工業(yè)上使用可編程邏輯控制器已經(jīng)相當(dāng)接近于一臺(tái)輕巧型計(jì)算機(jī),甚至已經(jīng)出現(xiàn)集成個(gè)人計(jì)算機(jī)(采用嵌入式操作系統(tǒng))與PLC結(jié)合架構(gòu)的可編程自動(dòng)化控制器(Programmable Automation Controller,簡稱PAC),能透過數(shù)字或模擬輸入/輸出控制機(jī)器設(shè)備、制造處理流程及其他控制的電子系統(tǒng)。
1、用于開關(guān)量控制
目前,PLC的首要目標(biāo),也是別的控制器無法與其比擬的,就是它能方便并可靠地用于開關(guān)量的控制。用PLC進(jìn)行開關(guān)量控制實(shí)例是很多的,冶金、機(jī)械、輕工、、紡織等等,幾乎所有工業(yè)行業(yè)都需要用到它。
2、用于模擬量控制
模擬量,如電流、電壓、溫度、壓力等等,它的大小是連續(xù)變化的。工業(yè)生產(chǎn),特別是連續(xù)型生產(chǎn)過程,常要對(duì)這些物理量進(jìn)行控制。用PLC實(shí)現(xiàn)模擬量控制是*可能的。
PLC進(jìn)行模擬量控制,要配置有模擬量與數(shù)字量相互轉(zhuǎn)換的A/D、D/A單元。它也是I/O單元,不過是特殊的I/O單元。
3、用于運(yùn)動(dòng)控制
實(shí)際的物理量,除了開關(guān)量、模擬量,還有運(yùn)動(dòng)控制。PLC可接收計(jì)數(shù)脈沖,加上PLC有數(shù)據(jù)處理及運(yùn)算能力,若再配備相應(yīng)的傳感器(如旋轉(zhuǎn)編碼器)或脈沖伺服裝置,則*可以依NC的原理實(shí)現(xiàn)種種控制。
4、用于數(shù)據(jù)采集
隨著PLC技術(shù)的發(fā)展,其數(shù)據(jù)存儲(chǔ)區(qū)越來越大。PLC還可配置上小型打印機(jī),定期把DM區(qū)的數(shù)據(jù)打出來。PLC也可與計(jì)算機(jī)通訊,由計(jì)算機(jī)把DM區(qū)的數(shù)據(jù)讀出,并由計(jì)算機(jī)再對(duì)這些數(shù)據(jù)作處理。這時(shí),PLC即成為計(jì)算機(jī)的數(shù)據(jù)終端。
5、用于信號(hào)監(jiān)控
PLC自檢信號(hào)很多,內(nèi)部器件也很多,多數(shù)使用者未充分發(fā)揮其作用。其實(shí),*可利用它進(jìn)行PLC自身工作的監(jiān)控,或?qū)刂茖?duì)象進(jìn)行監(jiān)控。
Sti MS4332C-AC1-15X-05R Light Curtain Transmitter/receiver Controller Assembly
Sti MCJ47-14-825-X2 Micro Safe Light Curtain Transmitter
Sti MCJ47-14-525-X3 Micro Safe Light Curtain Transmitter
Sti MCJ47-14-525-R3 Micro Safe Light Curtain Receiver
Sti MC42D-2-AC Light Curtain Controller
Sti FS4320BX-2 Flexsafe Light Curtain Transmitter 20in
Sti FS4312BX-1 Flexsafe B Light Curtain Transmitter 12in
Sti F3SJ-A0575P20-D Light Curtain 575mm 24v-dc
Steyr K235A2535AA01 Thrust Ball Bearing 5-7/8in 10-5/8in
Stellar ESC-687 Housing Security System Pcb Board
Stellar E-622B Pcb Circuit Board
Stellar E617/115 Housing Security System Board Assembly
Stearns 524080100 Brush Holder Assembly
Stearns 108704100DQF Electric Brake 35lb-ft 230/460v-ac
Starrett 436 1-12in 0.0001in Outside Micrometer Kit
Star Seiki P470-10 STEC-460 Teach Pendant
Stanley PSI-Q Process Qualifier Controller 110v-ac
Stanley EC02PB-3 Nutrunner 1580rpm 4.29nm
Stanley EC02LB-3 Nutrunner 1580rpm 3nm
Stanley EC02LA10-3 Nutrunner 1445rpm 3nm
Stanley E12PB-4 Nutrunner 2540rpm 7.5nm
Stanley E12LP-4 Nutrunner 2535rpm 4nm
Stanley E12LB-10 Nutrunner 1281rpm 10nm
Stanley E12LA13-18 Nutrunner 589rpm 18nm
Stanley E12LA13-10 Nutrunner 1081rpm 10nm
Stanley 21A111001/QC1001-X Nutrunner Controller
Stanley 21A108705 Nutrunner Torque Controller
Stanford Research Systems DG535 Four Channel Digital/pulse Generator
Square D NF1000G3 Powerlink G3 Controller
Square D 8851 P-7 Power Supply Module
Square D 8810SCO2V02S Size 1 Multi-speed Starter 120v-ac 10hp
Square D 8739 SCA 54 Size 1 Combination Starter 120v-ac 10hp
Square D 8736SDO2V02S Reversing Starter 120v-ac 25hp Size 2
Square D 8030 CRM510 Sy/max Network Interface Module Ser I
Spx ARDB2-0000 Auth Recharging Dehydrating Breather
Spx 3253067 Smart Rev C Pcb Circuit Control Board
Springville M600X43.75 31800 Double Acting Pneumatic Cylinder 6in 43.75in 250psi
Spraco 2647A43H09 Stainless Spray Nozzle
Sporlan SHGB-15E Solenoid Valve 120v-ac
Spirax Sarco FT44-10 Flanged Steam Trap 10bar 1in
Spirax Sarco 58158 Valve Mechanism Kit
Spencer VB-003SB-001 Regenerative Blower 60cfm 1/2hp 44in-h2o 40in-h2o 230v-ac
Spectrum S13624 1690-2000 Action Pak Alarm Module
Spectra-physics MILLENNIA EDGE Laser Controller
Spectra DBSMC1-08FA Channelized Multicoupler
Spears 1662 Flux Probe Kit
Speakman SE-590 10-gal Portable Eye Wash Station
Sparling Instruments 219-M SR-219-B00-51X-X Chart Recorder
Sorrento 0357-2070-012 Pcb Circuit Board Rev An
Sorrento 0357-2040-003 Pcb Circuit Board Rev H
Sorensen PTM15-.8D 440v-dc Power Supply Module
Sony DG10BSM Right Angle Gauging Probe
Sony DG10BP Gauging Probe