PLC作用：

PLC是多數(shù)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(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)接近于一臺輕巧型計(jì)算機(jī)，甚至已經(jīng)出現(xiàn)集成個人計(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)動控制

實(shí)際的物理量，除了開關(guān)量、模擬量，還有運(yùn)動控制。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)再對這些數(shù)據(jù)作處理。這時，PLC即成為計(jì)算機(jī)的數(shù)據(jù)終端。

5、用于信號監(jiān)控

PLC自檢信號很多，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ο筮M(jìn)行監(jiān)控。

Tobar 1505D02G14 Transmitter Capsule 1500psi

Tobar 1504D99G17 Transmitter Capsule

Tobar 1504D99G16 Transmitter Capsule

Titan Flow Control CV91 Stainless Wafer 8in Check Valve 300

Titan CV-42-SS Stainless Wafer Check Valve 10in 150

Titan CV-40-41-42-43-44-46 300 Stainless Wafer Check Valve 10in

Timken EE470075-40000 7-1/2in X 2-5/8in Tapered Roller Bearing Cone

Timken EE470075 7-1/2in X 2-5/8in Tapered Roller Bearing Cone

Timken A-5232-WS R6 160mm X 290mm X 3.875in Cylindrical Roller Bearing

Timken 470130 Tapered Roller Bearing Cup 13in X 2-1/2in

Thread-craft T-11585 Precision Ball Screw Assembly 1.98in

Thorn Emi 5336A Pcb Circuit Board

Thomson Micron UT075-010-0-RM075-39 True 75 Gearbox 10:1

Thermon TC 1818A.18.1 Heat Tracing Control And Monitoring Unit 120v-ac

Thermoflex CF200 Heat Detector 200f

Thermo Scientific SV100S Operator Interface Panel

Thermo Scientific AMS-4 Air Monitor

Thermo Scientific 9995 Cooler

Thermo Scientific 60-12C Ramsey Pro-line Speed Sensor

Thermo Scientific 60-12 ENC-500 Belt Speed Sensor

Thermo Scientific 4790 Continuous Gamma Level Sensor Detector

Thermo Scientific 410I-ANPDAB 410i Carbon Dioxide Co2 Analyzer 115v-ac

Thermo Scientific 20-38-4 Ramsey Tilt Switch Control

Thermo Scientific 111553-01 Vacuum Pump W/ Bumper Kit 1/8in Npt 115v-ac

Thermo Scientific 100536-00 42i Measurement Interface Board Rev G

Thermo Scientific 062463 Dp Pump Ship Kit Dual Analytical Ics3/5

Thermo Fisher 100862-00 43i Measurement Interface Pcb Circuit Board Rev H01

Thermo Environmental 200 SPC Stack Probe Controller 115v-ac

Thermo Electron 100862-00 43i Measurement Interface Pcb Circuit Board Rev F

Thermo Eberline HANDECOUNT Portable Counter

Thermo Eberline AC3-7 Alpha Scintillation Probe

Thermal Transfer BF-1602-D6-F-BR Heat Exchanger 250/150psi 350f

Thermal Instrument Adalet XIHFCX2-S4766 920-600-9 Digital Mass Flow Meter System

Thermal Instrument 920-600-9 Digital Mass Flow Meter 110v-ac

Thermal Instrument 600-9 Flow Meter Kit

Thermal Instrument 600 Inline Flow Meter

Thermal Instrument 600 Electronic Transducer 117v-ac

Thayer Scale 274415 PI-164 Controller Module

Textron MSH076SMA023-3 Whisperdrive Cone Drive Gear Reducer 15/16in 1-7/8in 9:1

Textron MSH076SMA023-3 Accudrive Right Angle Gear Reducer 15/16in 1-7/8in

Textron MH057171-5-ASSY Accudrive Gearmotor 3ph 3hp 460v-ac

Textron MH057171-4-ASSY Gearmotor Assembly 3ph 2.4kw

Texas Nuclear 63377D 6400 Level System Pcb Circuit Board

Texas Nuclear 625-63379D 6400 Level System Master Pcb Circuit Board

Tescom 44-1366-2121-273 6000psi 1500psi Self Venting Gas Regulator

Terra Technology SA-102 Accelerometer

Terra Technology DCA-333 80-323127-06 Controller Board

Terra Technology 80-351563-01 Pcb Circuit Board Rev G1

Terra Technology 70-001314-02 Pcb Circuit Board

Teral Kyokuto LLS327-62.2 Submersible Pump 2.2kw 200/220v-ac

Tera Systems PAC Controller Module 110v-ac 3a

Tera 200565B Sensor Interface Pcb Circuit Board

Telsonic SG3510 Handystar Ultrasonic Generator 120v-ac 35khz