PLC作用：

PLC是多數工業控制和工廠自動化系統的核心組成部分，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器的數據來實現廣泛的功能，然后使用這些數據來控制和制動外部設備。除此之外，成功的設計必須具備可靠性、系統穩定性以及與連接的自動化系統的互操作性。

現在工業上使用可編程邏輯控制器已經相當接近于一臺輕巧型計算機，甚至已經出現集成個人計算機(采用嵌入式操作系統)與PLC結合架構的可編程自動化控制器(Programmable Automation Controller，簡稱PAC)，能透過數字或模擬輸入/輸出控制機器設備、制造處理流程及其他控制的電子系統。

1、用于開關量控制

目前，PLC的首要目標，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量的控制。用PLC進行開關量控制實例是很多的，冶金、機械、輕工、、紡織等等，幾乎所有工業行業都需要用到它。

2、用于模擬量控制

模擬量，如電流、電壓、溫度、壓力等等，它的大小是連續變化的。工業生產，特別是連續型生產過程，常要對這些物理量進行控制。用PLC實現模擬量控制是*可能的。

PLC進行模擬量控制，要配置有模擬量與數字量相互轉換的A/D、D/A單元。它也是I/O單元，不過是特殊的I/O單元。

3、用于運動控制

實際的物理量，除了開關量、模擬量，還有運動控制。PLC可接收計數脈沖，加上PLC有數據處理及運算能力，若再配備相應的傳感器(如旋轉編碼器)或脈沖伺服裝置，則*可以依NC的原理實現種種控制。

4、用于數據采集

隨著PLC技術的發展，其數據存儲區越來越大。PLC還可配置上小型打印機，定期把DM區的數據打出來。PLC也可與計算機通訊，由計算機把DM區的數據讀出，并由計算機再對這些數據作處理。這時，PLC即成為計算機的數據終端。

5、用于信號監控

PLC自檢信號很多，內部器件也很多，多數使用者未充分發揮其作用。其實，*可利用它進行PLC自身工作的監控，或對控制對象進行監控。

Lot 2 Parker Check Valve ?", 4V-C4L-1/3-SS, Shipsameday #1541F

LOT 17, Swagelok Hose Connector, 1/4" Male NPT, 5/16" Hose ID, SS-5-HC-1-4, #T10

LOT 11 Swagelok Hose Connector 1/4" Female NPT, 5/16" Hose ID, SS-5-HC-7-4, #T11

Lot 10 Swagelok/Parker/Millipore Check Valve WGFG01HR1, 8Z(A)-C8L-1-T-SS #121V7

Lot 0f 55 CAPACITOR CERAMIC MULTILAYER 150V, 100A820FT150XTV #W68

Lot 0f 390 CAPACITOR CERAMIC MULTILAYER 150 V, 0.000075 uF, 100A560FT150XTV#W64

Lot 0f 354 CAPACITOR CERAMIC MULTILAYER 150 V, 0.000075 uF, 100A750FT150XTV#W63

Lot 0f 236 CAPACITOR CERAMIC MULTILAYER 150V, 100A360FT150XTV #W74

Lot 0f 20 SAMTEC SOCKET, 0.635MM, 100 POSITION, LSS-150-03-L-DV-A #W56

Lot 0f 150 CAPACITOR CERAMIC MULTILAYER 150V, 100A101FT150XTV #W67

Lot 0f 110 CAPACITOR CERAMIC MULTILAYER 150 V, 0.000075 uF, 100A360FT150XTV #W65

LOF OF 4 Parker A-LOK Inch Tube NPT Male Elbow, 12MSEL8N-316, 12MSEL8N316,

Lite-On Inc LED BAR GRAPH 10-SEGMENT GREEN, LTA-1000G, Lot Of 478, SHIPSAMEDAY

LINX REPEATER WITH TRIPLE ISOLATION, RS-422/485, 485OPDRI-USA, 4850PDRI-USA

Linear Switching Voltage Regulators, LT1373IS8#PBF, LOT OF 9, SHIPSAMEDAY

Linear Switching Voltage Regulators Ultra, LT1534IS#PBF, LOT OF 10, SHIPSAMEDAY

Linear LT1963ES8-3.3, LT1963ES8-3.3#PBF-ND, Lot Of 80, H#21

LINEAR LM317 Adjustable Output Voltage Regulator , LOT OF 50, SHIPSAMEDAY

Linear IC Reg Boost Adj 2a, LT1534IS-1#PBF, Lot Of 40, H#60

Linear IC POE CNTRL 1 CHANNEL 8DFN, LTC4257IDD-1#PBF, LOT OF 124, SHIPSAMEWDAY

Linear IC Opamp Gp 1.2 Mhz, LT1638IS8#PBF, LT1638IS8#PBF-ND, Lot Of 45, G#3

LIN ENGINEERING 8718L-02P-RO, 8718L-02P-R0, 8718L02PRO, SHIPSAMEDAY RACK H #H64

Leybold Inficon Heater Jacket, 912-322-P2, 117V, 95W, SHIPSAMEDAY#113P

Leybold AF 1,6 (No Motor) AF 1.6, 18902, 20200016568, SHIPSAMEDAY, RACK H #1M

LETATWIN Ribbon cartridge WHITE, LM-IR50W, LM-IR50W/WHITE, SHIPSAMEDAY

LETATWIN Ribbon cartridge Black, LM-IR50B, Max USA LM-IR50B, SHIPSAMEDAY

LEMO PHG.OK Cable 5 Pins, Shipsameday#1551A2

Lem Transducer LA305S, LA 305-S, 04-0150, 040150, SHIPsameday#1618B1

Legris MALE RUN TEE 3103 60 18, 31036018, 3/8" Npt X 3/8" Tube, Lot Of 11, K#8

LEGRIS MALE CONNECTOR 1/8" TUBE X 1/8" NPT, 3175 53 11, 31755311, LOT OF 99

LEGRIS ELBOW 1/8" TUBE X 10-32 UNF, 3109 53 20, 31095320, LOT OF 31 #129V6

Legris 3144 04 56, 31440456, 5/32" x 1/4" Double Y Adapter, Lot Of 11, P#13

Legris 3144 04 56 Fitting 5/32" x 1/4" Double Y Adapter, 31440456 Lot Of 10, K#7

LEGRIS 3100530099, Cartridge 1/8"mm, Lot of 94, SHIPSAMEDAY

Legris 3018 60 18, Single Banjo 3/8" tube x 3/8" NPT, 30186018, Lot Of 10, K#20

Legris 3009 58 14, 5/16" x 1/4" FNPT Female Elbow 30095814, Lot Of 10, K#22

LDS Vacuum Products 0531, Thermocouple Vacuum Gauge, 1/8" Npt, v#28

LDS FULL NIPPLE NW25 X 12.60", NW25-100-NL, NW25100NL, SHIPSAMEDAY

LDS CONICAL REDUCER, NW40 to NW25, NW40-25-CR, LOT OF 4, ShipSameDay#1628C2

Large Lot Miscellaneous Sanitary END CAP, REDUCER GASKET, GAUGE, SHIPSAMEDAY

Lancast TRANSLATOR CARD 10MBPS, 7318-14, 731814, Shipsameday #1212F

Lambda POWER SUPPLY INPUT 100-240VAC, HWS30-5/A, OUTPUT 5V, HWS305A, SHIPSAMEDAY

Laird Technologies DIRECT AIR MODULES 7.2A, 71w, DA-075-12-02-00-00, BOX 4 "P8"

Laird RF SHIELD 1.326"X1.45", BMI-S-106, BMIS106, LOT OF 76, SHIPSAMEDAY

Laird Ferrite Beads 600ohms 100MHz 1.5A Monolithic, MI1206K601R-10, LOT OF 2300

Kyocera XTAL OSC XO 40.0000MHZ, KC2520C40.0000C2YE00, LOT OF 83, SHIPSAMEDAY

KURT J. LESKER Weldable Tube Tee 4", G-7W-400, G7W400, SHIPSAMEDAY #158E

KURT J LESKER THERMOCOUPLE FEEDTHROUGH, TFT2KY00002, SHIPSAMEDAY#1654P1

KURT J LESKER SENSOR THERMOCOUPLE, CF 1-1/3", Lot Of 2, L#6

Kurt J Lesker Pneumatic angle valve NW-40, SA0150PVQF, SHIPSAMEDAY#129C3