PLC作用：
PLC是多數工業(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(tǒng)穩(wěn)定性以及與連接的自動化系統(tǒng)的互操作性。
現在工業(yè)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(tǒng))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(tǒng)。
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(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，特別是連續(xù)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(fā)展，其數據存儲區(qū)越來越大。PLC還可配置上小型打印機，定期把DM區(qū)的數據打出來。PLC也可與計算機通訊，由計算機把DM區(qū)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(jiān)控
PLC自檢信號很多，內部器件也很多，多數使用者未充分發(fā)揮其作用。其實，*可利用它進行PLC自身工作的監(jiān)控，或對控制對象進行監(jiān)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
