PLC作用：
PLC是多数工业控制和工厂自动化系统的核心组成部分，通常被称为工厂的“大脑"，PLC 通过接收和处理来自传感器和机器的数据来实现广泛的功能，然后使用这些数据来控制和制动外部设备。除此之外，成功的设计必须具备可靠性、系统稳定性以及与连接的自动化系统的互操作性。
现在工业上使用可编程逻辑控制器已经相当接近于一台轻巧型计算机，甚至已经出现集成个人计算机(采用嵌入式操作系统)与PLC结合架构的可编程自动化控制器(Programmable Automation Controller，简称PAC)，能透过数字或模拟输入/输出控制机器设备、制造处理流程及其他控制的电子系统。
1、用于开关量控制
目前，PLC的首要目标，也是别的控制器无法与其比拟的，就是它能方便并可靠地用于开关量的控制。用PLC进行开关量控制实例是很多的，冶金、机械、轻工、、纺织等等，几乎所有工业行业都需要用到它。
2、用于模拟量控制
模拟量，如电流、电压、温度、压力等等，它的大小是连续变化的。工业生产，特别是连续型生产过程，常要对这些物理量进行控制。用PLC实现模拟量控制是*可能的。
PLC进行模拟量控制，要配置有模拟量与数字量相互转换的A/D、D/A单元。它也是I/O单元，不过是特殊的I/O单元。
3、用于运动控制
实际的物理量，除了开关量、模拟量，还有运动控制。PLC可接收计数脉冲，加上PLC有数据处理及运算能力，若再配备相应的传感器(如旋转编码器)或脉冲伺服装置，则*可以依NC的原理实现种种控制。
4、用于数据采集
随着PLC技术的发展，其数据存储区越来越大。PLC还可配置上小型打印机，定期把DM区的数据打出来。PLC也可与计算机通讯，由计算机把DM区的数据读出，并由计算机再对这些数据作处理。这时，PLC即成为计算机的数据终端。
5、用于信号监控
PLC自检信号很多，内部器件也很多，多数使用者未充分发挥其作用。其实，*可利用它进行PLC自身工作的监控，或对控制对象进行监控。
PARKER NEEDLE VALVE 1/4" FNPT, 4F-V6LK-SS-1799, 4FV6LKSS1799 SHIPSAMEDAY#1535Q29
PARKER Miniature BALL VALVE 1/4", 4A-MB4LPFA-SSP, SHIPSAMEDAY#1624B7
PARKER Male Elbow 12BU, 12 CBU, 12CBU 3/4" Tube X 3/4" NPT, Lot Of 6, G#18
PARKER Male Connector 8-12 FTX-SS, 8-12-FTX-SS, LOT OF 3, SHIPSAMEDAY#1327H4
Parker Male Connector 37° Flare, 8-4 FTX-SS, 8-4-FTX-SS, LOT OF 5, SHIPSAMEDAY
PARKER MALE CONNECTOR 3/8" NPT, 4MSC6N-316 & 6MSC6N-316, LOT OF 24#1604N14
PARKER Male Connector 24 FTX-SS, 24FTX-SS, 24FTXSS, 1-1/2 X 11-1/2, Q#2
Parker Male Connector 1/2", 8MSC6N-316, 8MSC6N316, LOT OF 11, SHIPSAMEDAY
Parker Male Connector 1/2" NPT, M6MSC1/2N-316 & M12MSC3/4N-316, LOT OF 4 #1605N7
Parker Kuroda Solenoid With Block, PCS241B-NB-D24SP & PCL241B-NB-D24SP #1540D9
Parker Kuroda Solenoid With Block, PCS241B-NB-D24** & PCL241B-NB-D24** #1540D11
Parker Kuroda Solenoid With Block PCS241B-NB-D24** & PCL241B-NB-D24**, #1540D10
Parker Kuroda Solenoid PCS241B-NB-D24SP, With Block, SHIPSAMEDDAY#1554C2
Parker Kuroda Solenoid PCL241B-NB-D24SP, PCL24B-NB-D24**, SHIPSAMEDDAY#154D4
PARKER Inline Filter 5 MICRON, 1/4" COMP, 4Z(A)-F4L-5-SS, SHIPSAMEDAY
Parker Hannifin manual ball valve 1/2" FEMALE/MALE, XV501SS-8, LOT OF 2 #M15A
Parker Hannifin manual ball valve 1" SST, FEMALE/MALE, XV501SS-16, SHIPSAMEDAY
Parker Hannifin Fixing Clamp 21 cfm Domnick Hunter Air FXKE1, SHIPSAMEDAY#1550E6
Parker Hannifin Aries Servo Motor Drive, AR-01AE, AR01AE, SHIPSAMEDAY#1213GB
Parker Hannifin Aries Servo Motor Drive, AR-01AE, AR01AE, SHIPSAMEDAY#1213GA
Parker Filter 1 Micron Model 4Z-F4T-1-SS, shipsameday, #1547C5
Parker Female Bulkhead 1/2" FNPT X 12MM, M12FBC1/2N-316, LOT OF 3 #1605N6
PARKER FEMALE ADAPTER 3/8" COMP, 6FSC4N-316, 8FSC4N-316 , LOT OF 11 #1606Z15
PARKER EWAL Toggle Lever Bellow Valve 1/4" VCR, SHIPSAMEDAY #132711
Parker ETM6-316, SCM6-316, M6MBC1/4N-316, M6MSEL1/4N-316, M6MSEL1/8N-316 #1605N8
PARKER ELBOW UNION 1", 16EE16-316, 16EE16-SS, 16EE16316, SHIPSAMEDAY #1608P5
Parker ELBOW Flare 37°, 24CTX0-S, 24CTX0S, 1-1/2-11-1/2 X 1-1/2, #134A
PARKER Disconnect Female Thread Nipple 1/4" FNPT, FS-252-4FP, LOT OF 2 #S15V
Parker CYLINDER REPLACEMENT PK152HK001, ShipSameDay W/2-3Days Shipping #1639A8
Parker Cylinder 02.00CBB2AU14AC 1.000, CC564650A, 250psi, Shipsaneday #137G9
Parker CPI Ball Valve 1/2", 8Z(A)-B8LJ-SSP, 8Z-B8LJ-SSP, Shipsameday #ZR3
Parker CPI Ball Valve 1/2" PTFE, 8Z(A)-B8LJ-SSP, 8Z-B8LJ-SSP, Shipsameday #ZE32
PARKER Coupler & Nipple, NSS-371-6FO & NSS-372-6FO, 1 SET, SHIPSAMEDAY#1370Z6
Parker Compumotor M57-51-B, M5751B, Shipsameday W/2-3DAYSSHIPPING#1222G
PARKER Check Valve 3/8", 6Z(A)-C6L-1/3-SS, 6Z-C6L-1/3-SS, SHIPSAMEDAY#102V2
PARKER CHECK VALVE 3/8", 6A-C4L-1-BN-B, 6AC4L1BNB, LOT OF 2, SHIPSAMEDAY#102V3
PARKER Check Valve 1/8" & 1/4" FNPT, 4F-C4L-1/3-SS & 2F-C2L-1-SS, Lot Of 2 #ZG32
PARKER CHECK VALVE 1/4" NPT, 10 PSI, 4M-CAL-10-SS, LOT OF 2 SHIPSAMEDAY#B9E
PARKER Check Valve 1/3 PSI, 4A-C4L-1/3-SS, LOT OF4, SHIPSAMEDAY#1325F6
PARKER Check Valve 1/2", 8A-C8L-1-SS-C3, SHIPSAMEDAY, #1622B4
PARKER Check Valve 1/2", 1/3 psig Crack, 8A-C8L-1/3-SS, SHIPSAMEDAY#1370Z14
Parker Check Valve 1/2" FNPT, 1 Psi, 8F-C8L-1-T-SS, Shipsameday Box "B" #1614B50
PARKER Check Valve 1", 1/3 PSIG, 16A-C16-1/3-BN-B, SHIPSAMEDAY#1605V33
PARKER CAP 3/8" & 1/2", 6BLEN6-316, 8BLEN8-316, LOT OF 18, SHI[SAMEDAY #1604N11
Parker Buttweld Connector 6-1/4 ZHLW2-SS, 6-1/4 ZHBW2-SS, Lot Of 12, #123Q3
PARKER Bulkhead Union 3/4", 12-12WBZ-SS, 12-12 WBZ-SS, 1212WBZSS, shipsameday#S2
Parker Bulkhead 3/8", 6BC6-316, 6BC6316, Lot Of 6, SHIPSAMEDAY
PARKER BONNET NEEDLE VALVE 3/8", 6Z(A)-V6LK-SS, SHIPSAMEDAY#1649Q11
PARKER BONNET NEEDLE VALVE 3/8", 6A-V6LK-SS-1771, SHIPSAMEDAY#1606Z12
Parker Ball Valve Brass 1/2", 8A-B8LJ-BP, 8AB8LJBP, Shipsameday Box B #1614B51
PARKER Ball Valve 3/8", 6Z(A)-NP6LR-SSP, SHIPSAMEDAY#Q1A
