PLC作用：

PLC是多數(shù)工業(yè)控制和工廠自動化系統(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)接近于一臺輕巧型計(jì)算機(jī)，甚至已經(jīng)出現(xiàn)集成個人計(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)動控制

實(shí)際的物理量，除了開關(guān)量、模擬量，還有運(yùn)動控制。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、用于信號監(jiān)控

PLC自檢信號很多，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。

Lot Of 4900, PANASONIC Ceramic Capacitor ERJ-3GEYJ153V, SHIPSAMEDAY#AC71

Lot Of 4900, PANASONIC Ceramic Capacitor ERJ-3GEYJ103V SHIPSAMEDAY#AC36

Lot Of 4900, PANASONIC Ceramic Capacitor ERJ3EKF1003V, SHIPSAMEDAY#AC48

LOT OF 49, SMC fitting KJ MINI ONE TOUCH KJW06-M5, KJW06M5, SHIPSAMEDAY#1638B14

Lot Of 4800, PANASONIC Chip Resistor ERJ-6GEYJ301V, SHIPSAMEDAY#N115

Lot Of 4800, PANASONIC Chip Resistor ERJ-6GEYJ100V, SHIPSAMEDAY#W97

Lot Of 4800, PANASONIC Chip Resistor ERJ-6ENF10R0V, SHIPSAMEDAY#N128

Lot Of 4800, PANASONIC Chip Resistor ERJ-3GEY0R00V, SHIPSAMEDAY#N118

Lot Of 4800 PANASONIC Ceramic Capacitor ERJ-3EKF5111V, SHIPSAMEDAY#AC55

Lot Of 4800 CAL-CHIP CHIP RESISTOR RM06F1002CT, SHIPSAMEDAY#AC4

Lot Of 480, Coilcraft Fixed Inductors 0805CS, 0805CS-080XJLC, SHIPSAMEDAY#AA85

LOT OF 48, 3M SHROUDED HEADER 20 POS STRAIGHT, 2520-6002UB, SHIPSAMEDAY #AB8

LOT OF 476 Panasonic CAP ALUM 33UF 20% 50V SMD, EEE-FK1H330P, SHIPSAMEDAY#Y83

LOT OF 475, Samtec TSW-102-02-S-S, 2mm Socket Strip, SHIPSAMEDAY #169S

Lot Of 475, Murata Ceramic Capacitor, GRM21BR71E225KA73L, SHIPSAMEDAY#V194

Lot Of 474, Panasonic ECJ-2FB1E105K, PCC2319CT-ND, CAP CER 1UF 25V 10% X5R 0#V82

Lot Of 4700, YAGEO Chip Resistor RC0603JR-073K3L, SHIPSAMEDAY#AC9

Lot Of 4700, PANASONIC Chip Resistor ERJ-6ENF2102V, SHIPSAMEDAY#W100

Lot Of 4700, PANASONIC Chip Resistor ERJ-3GEYJ560V, SHIPSAMEDAY#N113

Lot Of 4700, PANASONIC Chip Resistor ERJ-3EKF49R9V, SHIPSAMEDAY#X60

Lot Of 4700, PANASONIC Chip Resistor ERJ-3EKF10R0V, SHIPSAMEDAY#N122

Lot Of 4700, PANASONIC Chip Resistor ERJ-1GEF1000C, SHIPSAMEDAY#N121

Lot Of 468, Keystone Electronics 5001 Circuit Board Hardware, 534-5001 , #V7

Lot Of 4600, Rohm Chip Resistor, MCR10EZHF4751 , SHIPSAMEDAY #N157

Lot Of 4600, PANASONIC Chip Resistor ERJ-3GEYJ101V, SHIPSAMEDAY#W107

Lot Of 4600, PANASONIC Chip Resistor ERJ-3GEY0R00V, SHIPSAMEDAY#N135

Lot Of 46, Phoenix Contact 12 Position Terminal Block, 1803374, SHIPSAMEDAY #Y17

Lot Of 4500, PANASONIC Chip Resistor ERJ-6GEYJ330V, SHIPSAMEDAY

Lot Of 4500, PANASONIC Chip Resistor ERJ-3GEYJ100V, SHIPSAMEDAY#N124

Lot Of 4500, PANASONIC Ceramic Capacitor ERJ-3GEYJ472V, SHIPSAMEDAY#AC84

Lot Of 450, PANASONIC Ceramic Capacitor, ECJ-0EB1H101K, SHIPSAMEDAY#V167

LOT OF 450, AVX Tantalum Capacitors Polymer SMD 6.3volts, TCJB107M006R0070 #AA7

Lot Of 450, AVX PBRC-12.00HR CERAMIC RESONATOR, 12MHZ, SMD, SHIPSAMEDAY#S88

Lot Of 45, Texas IC REG LINEAR 3.3V 500MA, LP2989AIMM-3.3/NOPB?, SHIPSAMEDAY

Lot Of 45, Swagelok Male Adapter 1/4" Npt X 10mm, B-10-MTA-1-4, Rack A #A41

LOT OF 45, Samtec Conn Power Mate Terminal Strip, IPBT-105-H1-T-D-RA, #AB9

Lot Of 45 Microchip IC REG LDO 1.8V 1.5A TO263-3, MIC39150-1.8WU, SHIPSAMEDAY#Y4

Lot Of 4400, PANASONIC Chip Resistor ERJ-6ENF1502V, SHIPSAMEDAY#W104

Lot Of 4400, PANASONIC Chip Resistor ERJ-3GEYJ302V, SHIPSAMEDAY#N114

Lot Of 4400, PANASONIC Chip Resistor ERJ-3GEYJ102V, SHIPSAMEDAY#W99

Lot Of 44, Maxim MAX6966AEE+, LED Display Drivers 10-Port Constant LED Dr #Q47

Lot Of 44 Relay Omron Idec Potter Brumfield Releco Culter Hammer, #137L5

Lot Of 4300, PANASONIC Chip Resistor ERJ-3EKF1001V, SHIPSAMEDAY#N134

Lot Of 4300, KOA Thick Film Resistors, RK73B2ALTD102J, SHIPSAMEDAY#AC5

Lot Of 430, PANASONIC CAP ALUM 47UF 20% 35V SMD, EEE-FK1V470P, #AB39

Lot Of 43, Texas Power Switch 2A 6-P, TPS22924CYZPT-BKN, TPS22924CYZPT/BKN #V136

Lot Of 43 Molex CONN HEADER R/A 10POS 4.2MM, 0039301101, WM1367-ND?, SHIPSAMEDAY

LOT OF 43 Centering Ring NW50 Assembly 304 SST, ONLY 8 WIH O-RING, SHIPSAMEDAY

Lot Of 43 AVX TAJB336K016R Cap Tant Solid 33uF 16V B CASE 10% (3.5 X 2.8 X 1#W28

Lot Of 428, AVX Corporation CAP CER 18PF 250V 5% 0603, SQCSVA180JAT1A, N#42