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PLC是以微處理器為基礎(chǔ)，綜合了計(jì)算機(jī)技術(shù)、自動(dòng)控制技術(shù)和通信技術(shù)，用面向控制過程面向用戶的“自然語言”編程，適應(yīng)工業(yè)環(huán)境，簡(jiǎn)單易懂、操作方便、可靠性高的新一代通用工業(yè)控制裝置。PLC是在繼電器順序控制基礎(chǔ)上發(fā)展起來的以微處理器為核心的通用自動(dòng)控制裝置。

可編程序控制器是一種數(shù)字運(yùn)算操作電子系統(tǒng)，專為在工業(yè)環(huán)境下應(yīng)用而設(shè)計(jì)。它采用了可編程序的存儲(chǔ)器，用來在其內(nèi)部存儲(chǔ)執(zhí)行邏輯運(yùn)算、順序控制、定時(shí)、計(jì)數(shù)和算術(shù)運(yùn)算等操作指令，并通過數(shù)字的、模擬的輸入和輸出，控制各種類型的機(jī)械或生產(chǎn)過程。可編程序控制器及其有關(guān)的外圍設(shè)備，都應(yīng)按易于與工業(yè)控制系統(tǒng)形成一個(gè)整體、易于擴(kuò)充其功能的原則設(shè)計(jì)。

PLC產(chǎn)品種類繁多，其規(guī)格和性能也各不相同。對(duì)于PLC，通常根據(jù)其結(jié)構(gòu)形式的不同、功能的差異和I/O點(diǎn)數(shù)的多少等進(jìn)行大致分類。

按結(jié)構(gòu)形式分類

根據(jù)PLC的結(jié)構(gòu)形式，可將PLC分為整體式和模塊式兩類。

整體式PLC

整體式PLC是將電源、CPU、I/O接口等部件都集中裝在一個(gè)機(jī)箱內(nèi)，如圖所示。具有結(jié)構(gòu)緊湊、體積小、價(jià)格低的特點(diǎn)。小型PLC一般采用這種整體式結(jié)構(gòu)。整體式PLC由不同I/O點(diǎn)數(shù)的基本單元（又稱主機(jī)）和擴(kuò)展單元組成，基本單元內(nèi)有CPU、I/O接口、與I/O擴(kuò)展單元相連的擴(kuò)展口以及與編程器或EPROM寫入器相連的接口等；擴(kuò)展單元內(nèi)只有I/O和電源等，而沒有CPU。基本單元和擴(kuò)展單元之間一般用扁平電纜連接。整體式PLC一般還可配備特殊功能單元，如模擬量單元、位置控制單元等，使其功能得以擴(kuò)展。

2）模塊式PLC

模塊式PLC將PLC的各組成部分分別做成若干個(gè)單獨(dú)的模塊，如CPU模塊、I/O模塊、電源模塊（有的含在CPU模塊中）以及各種功能模塊。模塊式PLC由框架或基板和各種模塊組成，模塊裝在框架或基板的插座上，如圖所示。這種模塊式PLC的特點(diǎn)是配置靈活，可根據(jù)需要選配不同規(guī)模的系統(tǒng)，而且裝配方便，便于擴(kuò)展和維修。大、中型PLC一般采用模塊式結(jié)構(gòu)。

還有一些PLC將整體式和模塊式的特點(diǎn)結(jié)合起來，構(gòu)成所謂的疊裝式PLC。疊裝式PLC的CPU、電源、I/O接口等也是各自獨(dú)立的模塊，但它們之間是靠電纜進(jìn)行連接的，并且各模塊可以一層層地疊裝。這樣，不但系統(tǒng)可以靈活配置，還可做得體積小巧。

2.2.按功能分類

根據(jù)PLC的功能不同，可將PLC分為低檔、中檔、。

Woodward Synchronizing System SPM-D Controller 8440-1301 Rev E Model: SPM-D10
Woodward Synchronizer P/N 9907-029 Rev C
Woodward SY2 Synchronisierger?t SY 2 SY2-400-50 Synchronizing Unit SEG 2G
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Woodward Steuerger?t EPG Speed Control 8290-044 E
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WOODWARD SPM-A SYNCHRONIZER, PN 9905-005, EXC COND
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WOODWARD SPM-A SYNCHRONIZER, PN 9905-003, EXC COND
WOODWARD SPM-A SYNCHRONIZER, PN 9905-001, EXC COND
Woodward SPM-A Synchronizer PN 9905-002
WOODWARD SPM-A SYNCHRONIZER MODEL 9905-001 L - CLEAN
Woodward SPM-A Synchronizer 9905-002 REV-P 
Woodward SPM-A Synchronizer 9905-002 N 
WOODWARD SPM-A SYNCHRONIZER 9905-002
WOODWARD SPM-A SYNCHRONIZER 50/60HZ 10W 9907-028 REV D
WOODWARD SPM-A SYNCHRONIZER 50/60HZ 10W 9905-002 REV N
Woodward SPM-A Synchronizer / Part # 9907-028
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Woodward SPM-A synchonizer 9907-029 REV.B
Woodward SPM-A synchonizer 9907-018 Rev. C
WOODWARD SPM-A (9905-001) SYNCHRONIZER WITH MANUAL 
WOODWARD SPM SYNCHRONIZER, PN 8272-385, 
WOODWARD SPM SYNCHRONIZER, PN 8271-610, EXC COND
Woodward SPM Synchronizer Model 8271-607A NNB
WOODWARD SPM SYNCHRONIZER 8272-190-C
Woodward Speed Setting Potentiometer Bracket Assembly 5438-121 NOS
WOODWARD SOLENOID VALVE 8402-238
WOODWARD SOLENOID VALVE 8402-214 5852-159
WOODWARD SOLENOID VALVE 5852-130
WOODWARD SOLENOID VALVE 5852-130
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Woodward ProTech 203 Overspeed Protection System 9905-990 Rev G With Key
Woodward ProTech 203 Overspeed Protection System 9905-990 Rev G No Key
Woodward Protech 203 Overspeed Protection System 9905-990 Rev G Missing 2 PS
Woodward Protech 203 Overspeed Protection System 8200-203 Rev N
WOODWARD PROTECH 203 OVERSPEED PROTECTION PN 9905-995
WOODWARD PROTECH 203 OVERSPEED PROTECTION PN 8200-301
WOODWARD PROCESS/IMPORT-EXPORT CONTROL, PN 9905-090, EXC COND
WOODWARD Process Import-Export Control (Part #9905-090 H) EXC COND
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Woodward PM Motor Control 8272-536 
Woodward Piston Part # 3525-039
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WoodWard PG Lever Governor S/N: 420991
WOODWARD PEAK 150 DIGITAL STEAM TURBINE CONTROLLER 9905-867 REV-J NNB
Woodward Part # 8272-288 0 Load Sharing Speed Controller 2301A
Woodward Netcon 5000 Input Module 5464-333
WOODWARD NETCON 5000 DISCREET OUTPUT MODULE, EXC COND
WOODWARD NETCON 5000 CPU MODULE, , EXCELLENT COND
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WOODWARD NETCON 5000 (PART # 5464-588) SERIAL #11459522
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Woodward Module 5466-409
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Woodward MFR 1 RELAY
Woodward Master Synchronizer and Load Control 9907-004 Rev N
Woodward Master Synchronizer and Load Control 9905-797 Rev M
WOODWARD LOAD SHARING AND SPEED CONTROL, PN 9905-068, EXC COND
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WOODWARD LOAD SHARING AND SPEED CONTROL 8271-652, EXC COND
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Woodward Governor w/ Bodine Electric Co Motor for Detriot Diesel - P/N: 8561-537
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Woodward Governor Type UG-8 PN: 34381 NOS
WOODWARD GOVERNOR TYPE PG-PL PUMP CONTROL 8552-674, 
WOODWARD GOVERNOR TURBINE ELECTRICAL CONTROL ASSEMBLY, MODEL 8230-621
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WOODWARD GOVERNOR SPEED SETTING PISTON 361324
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Woodward Governor Part # 8240-005 Serial # 1088064 
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Woodward Governor Oil Gauge Site Glass 1832-109 NOS
Woodward Governor Gas Shutoff Valve 9905-451
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Woodward Governor Field Terminal Module 5437-079
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