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(jiǎn)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(wú)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。
Lot Of 3, Aristo Bausch & Lomb Microscope Ring Lights 2M1457-2, 21457-2 #133H
LOT OF 3, Amphenol FCI Conn Daughter Card RCP, 10095505-101LF, M10514A #AA110
Lot Of 3, AMAT 3870-03341 Ham-Let HMS20-4VKLQ-LD Valve, Shipsameday R#18
Lot Of 3, Allen-Bradley 1492-CB2G060 1492CB2G060 Ship Same Day #1654A17
Lot Of 3, Allen-Bradley 1492-CB1-G060-NB 1492CB1G060NB ShipSameDay#1654A16
LOT OF 3, Allen Bradley Circuit Breaker 1492-SP, 1P 20A, 1492-SPM1C200, #1217J
Lot Of 3, Allen Bradley 800MS-PT16R (2X) 800MS-P16 (1X) Shipsameday #1174N
Lot Of 3, ALLEN BRADLEY 592-B0V169 & 595-A02, 3-POLE MANUAL RESET, Rack K #K21
LOT OF 3, ALLEN BRADLEY 1492-GHD010F, 1492GHD010F CIRCUIT BREAKER, #1629AZ
Lot Of 3, ACME CONTROL TRANSFORMER 100VA, ET-83342, SHIPSAMEDAY
Lot Of 3, Absolute Process Instruments Relay W/Base, API-4300-G, API4300G #1637R
Lot Of 3, 3M Wrist Strap Table Grounding System 98-0798-1068-1, Shipsameday#129N
LOT OF 3 Turck cable, PKG 4M-4-RS 4.4T, PKG4M-4-RS4.4T, SHIPSAMEDAY#138K
Lot Of 3 Texas Instruments Interface Module Input 6MT11-E05L, Shipsameday #1166D
Lot of 3 SWAGELOK Union Cross Fitting 1/2", SS-810-4, SS8104, Shipsameday #Z20
LOT OF 3 Swagelok Tee 1/2" & 3/4", SS-1210-3, SS-810-3, SHIPSAMEDAY #125Q4
Lot Of 3 Swagelok SS-4CA-3, SS4CA3, Poppet Check Valve 1/4" COMP ShipSameDay#J11
LOT OF 3 SWAGELOK SS-4C-1/3, Poppet Check Valve 1/3 PSIG, SHIPSAMEDAY
Lot Of 3 SWAGELOK SS-1611-PC, Port Connector 1", SHIPSAMEDAY #1373F2
Lot Of 3 SWAGELOK Quarter Turn Instrument Plug Valve 1/4" NPT, SS-4P4T2 #1325P7
Lot Of 3 SWAGELOK Poppet Check Valve 3/8", SS-6C-1 & SS-6C-1/3, ShipSameDay#ZE48
LOT OF 3 SWAGELOK Male Branch Tee 1/2", SS-810-3-8TTM, SHIPSAMEDAY#V1H
Lot Of 3 Swagelok Bulkhead 3/8"T x 1/2" MVCR, SS-8-VCR-A1-600, Shipsameday ZB#71
LOT OF 3 SQUARE D PILOT LIGHT 9001-JT35, 9001JT35, ShipSameDay BOX "B" #1614B41
Lot Of 3 SMC SOLENOID VALVE 3-PORT, 24V, VP342-5DZ1-02A-F, SHIPSAMEDAY
LOT OF 3 SMC Shock Absorber; M10xP1.0 6mm stroke, RB1006SJ, MAB01040 SHIPSAMEDAY
Lot Of 3 Siemens Motor Strater Protector 3RV1021,3RV1421, See Detail Bel #137H4
Lot Of 3 SIEMENS 6ES7 151-1CA00-0AB0, SIEMENS 6ES7 151-1CA00-0AB0, #1607P2
Lot Of 3 SICK I11-S213, SICK I11S213, Safety Switch, ShipDameDay#1646BQ
LOT OF 3 SCM MANIFOLD VALVE, SV3000-50-21A-C0, SV30005021AC0, SHIPSAMEDAY#120PB
LOT OF 3 RSI CABLE ABF02KM5c-250.06.0 (2X) & RSI ABF02KM5c-250.09.0 #142H
Lot Of 3 PULLEY/SEHO Pulley, 93010920, SHIPSAMEDAY
LOT OF 3 PARKER TEE UNION 1/2" & 3/4", 8-8-8 JLZ-SS & 12-12-8 JLZ-SS, #1622C4
Lot Of 3 PARKER Needle Valve 1/4", 4Z(A)-V4LN-B & 4M-V4LN-B, SHIPSAMEDAY
Lot Of 3 PARKER Female Pipe Elbow NPTF / NPTF, 1/2 DD-SS, 1/2 DDSS, SHIPSAMEDAY
LOT OF 3 PARKER Check Valve 1/4” NPT, 4M-C4L-1-BN-B, SHIPSAMEDAY
Lot Of 3 PARKER Check Valve 1/2", BRASS, 8A-C8L-1/3-BN-B, SHIPSAMEDAY
Lot Of 3 PARKER Ball Valve 1/8”, 2Z(A)-MB2LPFA-BP, 2Z-MB2LPFA-BP, SHIPSAMEDAY
LOT OF 3 PARKER 8A-V6LR-SS (2X) & 4A-V4LN-SS, Needle Valve 1/2" & 1/4" #1537P3
Lot Of 3 Parker 6A-C6L-1/3-BN-B, Check Valve 1/3 PSI, 3/8" COMP, SHIPSAMEDAY#Q1D
Lot Of 3 OMRON Optical Switches, EE-SX771 (1X) & EE-SX871P (2X), SHIPSAMEDAY
Lot Of 3 OMRON LIMIT SWITCH, SHL-Q22155, SHLQ22155, SHIPSAMEDAY
Lot Of 3 OMRON Fiber Optic Sensors HEAVY DUTY, E32-D11, E32-D11, ShipSameday
Lot Of 3 NURPO Poppet Check Valve 1/3 PSIG, SS-4C-1/3, SS4C1/3, SHIPSAMEDAY
Lot Of 3 Nupro Poppet Check Valve 1/8", SS-2C2-TR-100, 100 Psi, Shipsameday#ZR8
Lot Of 3 Nupro ADJUSTABLE RELIEF Valve 1/4",1psi, SS-4CP2-SI-1, Shipsameday#ZR7
Lot Of 3 Modicon Processor AS-S942-012 (2X) & AS-S908-110 Shipsameday
LOT OF 3 MILLIPORE Filter 1/4” VCR WG2FT1RR2, 4HS-P8779-1, GLFF4400VMM4, #1174Q1
Lot Of 3 LANSING RESEARCH 22 505 & THE L.S.STARRETT ATHOL 0-20 Shipsameday#1373M
Lot Of 3 IKO Roller Follower, NAST17ZZUUR, SHIPSAMEDAY
LOT OF 3 IDEC IZUMI PUSHBUTTON 41-10650,ABS300, 68X33, HW-G01, A600, 69211#1622T
Lot Of 3 HOKE 3732M4Y, VALVE NEEDLE 1/4" NPT, SHIPSAMEDAY #1549D4