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(duì)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(duì)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?duì)象進(jìn)行監(jiān)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
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Parker SOLENOID VALVE H17VXBG0B9B, PHCH17VXBG0B9B, ShipSameDay #1175D
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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
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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
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PARKER Quick Connect 1/2", 8AH-Q8CY-SSP, 8A-Q8CY-SSP, 8A-Q8VY-SS, LOT 3 #1540Q8
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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
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Parker P1JS050KS0050, P1J-S050KS-0050, Shipsameday #135AE
PARKER NIPPLE & PLUG 1/4" , 4-4 MHN-SS & 4 PHH-SS, LOT OF 29, SHIPSAMEDAY#1327H5
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Parker Needle Valve 1/8" NPT X 1/8" FNPT, 2M2F-V4LN-SS, SHIPSAMEDAY #1326B8
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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
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