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ο筮M(jìn)行監(jiān)控。
SMC DOUBLE ACTING AIR CYLINFDER 100MM BORE 525MM STROKE CLAFN100-525N-E-X1US
SMC CYLINDER SLIDE TABLE STROKE ADJ. MXS12L-20AS NNB
SMC CYLINDER NCA1X250-0600-XTST
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SMC CYLINDER 40 MM BORE 600 MM STROKE CY2B40H-600-X132
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SMC COMPACT ROTARY ACTUATOR CDRQ2BS30-180C-M9BL NNB
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SMC 145PSI PNEUMATIC CYLINDER SLIDE MGGLB40-100+400-X61US
SMC 145PSI 1.0MPa PNEUMATIC CYLINDER CDNAFN80N-480-D
SMC 145PSI 1.0MPa PNEUMATIC CYLINDER CDNAFN63N-G3306-XC11(114-330)
SMC 145PSI 1.0MPa PNEUMATIC CYLINDER CDNAFN63N-900-D
SMC 145PSI 1.0MPA PNEUMATIC CYLINDER ACNL-X2-80X785-CB-S-X0 18-X142US
SMC 145PSI 1.00MPA PNEUMATIC CYLINDER CLA2L63TN-470-E-X1US 100910
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SMC 100MM BORE 525MM STROKE AIR CYLINDER CLAFN100-525N-E 101002
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SMC 0.15-0.7MPA PNEUMATIC GUIDED CYLINDER PRESS MXW16-150B-M9N
SMC ELECTRO-PNEUMATIC REGULATOR ITV2050-11N3BL4
SMB LAC-2 DRIVE CONTROLLER BOARDS 10302PC-01 / 10292PC-04 / 10302A1-01 105433
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SMARTEYE CORP SP1029/02 SER.94033 SEA NEMA-12 W/ DISP & MDI
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SKF/TCM BALLSCREW 2.00DX.25P A-7799 / 30-829
SKF/TCM 23334, BALL SCREW WITH BALL NUT, 38" OVERALL LENGTH,
SKF PROGRESSIVE FEEDER VPBM-4-ZY
SKF PRECISION BALL BEARING 6210 Y/C782
SKF MAINTENANCE PRODUCT HEATER 728605 A / 8008
SKF MAINTENANCE PRODUCT 729134
SKF LDS OIL SEAL 2225569
SKF LARGE DIAMETER SEAL 1900569
SKF BEARING LUBRICATOR CNP 2 / 787 95 TR / HMV 33 A
SKF BEARING LUBRICATOR 8 GANG/ZOLL 66