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。
PARKER/SWAGELOK TEE UNION 3/8", SS-600-3 & 6SC6-316, LOT OF 7 SHIPSAMEDAY#128R22
PARKER/SWAGELOK TEE ELBOW UNION, 8FEL8N-316, SS-810-3, SS-810-6, LOT OF 3#1649V7
PARKER/SWAGELOK TEE ELBOW 3/8", 6EE6-316, SS-600-3, SS-600-6, LOT OF 5#1649V3
PARKER/SWAGELOK TEE ELBOW 1/4" SS-400-3, 4ET4-316, SS-400-8-4 , LOT OF 7#1649V4
PARKER/SWAGELOK TEE 4ET4-316, 6ET6-316, 8TUR4-316, SS- 810-3, SS- 600-1-6#1543P8
Parker Veriflo Bellows Sealed Valve, 944AOPHPNCSFSMM, SHIPSAMEDAY #128B9
Parker VacuSeal Male Nut 1/4", 4 BVI-SS .54, 4 BVISS.54, LOT OF 22, #1539H4
PARKER UNION TEE ELBOW 3/4", 12SC12-316, 12ET12-316, 12EE12-316, LOT OF 9
PARKER UNION 3/4" 12ET12-316, 12SC12-316, 12MSC12N-316, 12MSEL12N-316 #1325F5
PARKER UNION 1/4" 3/8 1/2", 4SC4-316, 6SC6-316, 8SC8-316, LOT OF 15, #1606Z14
PARKER TUBE STUB CONNECTOR LOHT3-SS, 16-8X065 LOHT3-SS, 16-8X065LOHT3-SS #1535B6
PARKER TRIPLE-LOK® 37° 5/8" Nuts 10 BTX-SS (13X) & Sleeves 10 TX-SS (13X) #1605B
PARKER TRIPLE-LOK® 37° 1/4" Nuts 4 BTX-SS (26x) and Sleeves 4 TX-SS (27x) #1605Z
Parker Triple-Lok Union Elbow 16 ETX-SS, 16-ETX-SS, 16ETXSS, Shipsameday #C19
PARKER Triple-Lok 37° Plug and Cap PNTX, 8 PNTX-SS, 8PNTXSS, LOT OF 17
PARKER Triple-Lok 37° 90° Elbow C5OX, 12-10 C5OX-SS 3/4" X 7/8-14 #ZL23
PARKER Three Way Ball Valve 1/4" FNPT, 4F-B6XJ-SSP, 4FB6XJSSP, SHIPSAMEDAY
Parker Tee Union 1" X 1/2" X 1", 16-16-8 JLZ-SS, 16168JLZSS, SHIPSAMEDAY
Parker Solenoid Valve, 7121KBN2LR00A0J322C2, SHIPSAMEDAY #1615B5
PARKER Solenoid valve H21WXBG323000FC, H2 S SOL 120 AC, SHIPSAMEDAY #1614J
Parker SOLENOID VALVE H17VXBG0B9B, PHCH17VXBG0B9B, ShipSameDay #1175D
PARKER SOLENOID VALVE 1/4" FNPT, 04F20C3103A1F4C80, Shipsameday#1654A48
PARKER SOLENOID VALVE 1/4" FNPT, 04F20C3103A1F4C80, Shipsameday#156AF
Parker Solenoid & DSL103N, 120V 20W ShipSameDay W/2-3daysShip #1544Z
Parker Skinner Valve 24V N.C., 71215SN2GN00N0H111C2, Shipsameday#1623K
PARKER SKINNER VALVE 10WATTS, N0C111C2, 400 PSI, 71225SN1GF00 Shipsameday#1624Z5
PARKER Reducer 3/8" X 1/4", 6TUR4-316, 6TUR4316, LOT OF 12, SHIPSAMEDAY #1604N18
PARKER Quick Connect, NSS-371-6FO, NSS-371-6F0, SHIPSAMEDAY#1535Q14
Parker Quick Connect 1/4", Green Key, 4A-Q4CY-SSK3, LOT OF 3, SHIPSAMEDAY#1604N6
PARKER Quick Connect 1/4" FNPT, FS-251-4FP, FS2514FP, LOT OF 2 #1535Q12
PARKER Quick Connect 1/2", 8AH-Q8CY-SSP, 8A-Q8CY-SSP, 8A-Q8VY-SS, LOT 3 #1540Q8
PARKER Push-Lok, Female Seal-Lok, JC88-16-16C, JC881616C, SHIPSAMEDAY#1535B7
Parker Push-Lok to CPI Connector 1/4", 4-4 P2T2-SS, 44P2T2SS, LOT OF 19 #1540Q6
PARKER PUSH ON FIELD ATTACHABLE HYDRAULIC HOSE 3/4", 30682-12-12B, LOT OF 10
Parker Process Ball Valve 1/4" 4Z(A)-B6LJ-SSP, 4Z-B6LJ-SSP, SHIPSAMEDAY #ZB47H
Parker Precision Metering Valve, 4V-NML-V-SS-V, Shipsameday#102PL
PARKER Port Connector 3/8", 6PC6-316, 6PC6316, LOT OF 18, SHIPSAMEDAY#1604N9
PARKER Poppet Check Valve 1/4", 4V-C04L-1/3-V-SS-PP, 4V-CO4L-1/3-V-SS-PP, #Y33
PARKER PLUG 3/8" & 1/2", 8BLP8-316 & 6BLP6-316, LOT OF 19, SHI[SAMEDAY #1604N12
Parker P1JS050KS0050, P1J-S050KS-0050, Shipsameday #135AE
PARKER NIPPLE & PLUG 1/4" , 4-4 MHN-SS & 4 PHH-SS, LOT OF 29, SHIPSAMEDAY#1327H5
PARKER Needle Valve 3/8", 6A-V6LN-SS, 6AV6LNSS, SHIPSAMEDAY#1325F3
Parker Needle Valve 1/8" NPT X 1/8" FNPT, 2M2F-V4LN-SS, SHIPSAMEDAY #1326B8
PARKER Needle Valve 1/4", 4M-V4LN-SS-C3, 4MV4LNSSC3, SHIPSAMEDAY#S5
PARKER Needle Valve 1/4", 4M-V4LN-SS, 4MV4LNSS, Lot Of 2, SHIPSAMEDAY#1325A8
Parker NEEDLE VALVE 1/4", 4A-P4R-SSV, 44900306, 315577-2, SHIPSAMEDAY#128R11
PARKER Needle Valve 1/4" FNPT, 4F-V6LR-SS, 4FV6LRSS, SHIPSAMEDAY
