PLC是以微處理器為基礎(chǔ)，綜合了計算機技術(shù)、自動控制技術(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控制裝置。
可編程序控制器是一種數(shù)字運算操作電子系統(tǒng)，專為在工業(yè)環(huán)境下應(yīng)用而設(shè)計。它采用了可編程序的存儲器，用來在其內(nèi)部存儲執(zhí)行邏輯運算、順序控制、定時、計數(shù)和算術(shù)運算等操作指令，并通過數(shù)字的、模擬的輸入和輸出，控制各種類型的機械或生產(chǎn)過程？删幊绦蚩刂破骷捌溆嘘P(guān)的外圍設(shè)備，都應(yīng)按易于與工業(yè)控制系統(tǒng)形成一個整體、易于擴充其功能的原則設(shè)計。
PLC產(chǎn)品種類繁多，其規(guī)格和性能也各不相同。對于PLC，通常根據(jù)其結(jié)構(gòu)形式的不同、功能的差異和I/O點數(shù)的多少等進行大致分類。
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機箱內(nèi)，如圖所示。具有結(jié)構(gòu)緊湊、體積小、價格低的特點。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點數(shù)的基本單元（又稱主機）和擴展單元組成，基本單元內(nèi)有CPU、I/O接口、與I/O擴展單元相連的擴展口以及與編程器或EPROM寫入器相連的接口等；擴展單元內(nèi)只有I/O和電源等，而沒有CPU；締卧蛿U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單獨的模塊，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接口等也是各自獨立的模塊，但它們之間是靠電纜進行連接的，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、。
METSO AUTOMATION A413082 / A413082
METSO AUTOMATION A413082 / A413082
METSO AUTOMATION A413082 / A413082
METSO AUTOMATION A413082-32-8M / A413082328M
METSO AUTOMATION A413095 / A413095
METSO AUTOMATION A413110 / A413110
METSO AUTOMATION A413125 / A413125
METSO AUTOMATION A413125 / A413125
METSO AUTOMATION A413135 / A413135
METSO AUTOMATION A413135 / A413135
METSO AUTOMATION A413135 / A413135
METSO AUTOMATION A413139 / A413139
METSO AUTOMATION A413139 / A413139
METSO AUTOMATION A413139E / A413139E
METSO AUTOMATION A413140 / A413140
METSO AUTOMATION A413150 / A413150
METSO AUTOMATION A413150 / A413150
METSO AUTOMATION A413152 / A413152
METSO AUTOMATION A413160 / A413160
METSO AUTOMATION A413160 / A413160
METSO AUTOMATION A413160 / A413160
METSO AUTOMATION A413171 / A413171
METSO AUTOMATION A413187 / A413187
METSO AUTOMATION A413187 / A413187
METSO AUTOMATION A413187D / A413187D
METSO AUTOMATION A413200 / A413200
METSO AUTOMATION A413216 / A413216
METSO AUTOMATION A413230 / A413230
METSO AUTOMATION A413230 / A413230
METSO AUTOMATION A413240 / A413240
METSO AUTOMATION A413240 / A413240
METSO AUTOMATION A413240A / A413240A
METSO AUTOMATION A413240A10 / A413240A10
METSO AUTOMATION A413240AB / A413240AB
METSO AUTOMATION A413256-03 / A41325603
METSO AUTOMATION A413256-04 / A41325604
METSO AUTOMATION A413263-04 / A41326304
METSO AUTOMATION A413263-05 / A41326305
METSO AUTOMATION A413267-02 / A41326702
METSO AUTOMATION A413310 / A413310
METSO AUTOMATION A413311 / A413311
METSO AUTOMATION A413325 / A413325
METSO AUTOMATION A413325 / A413325
METSO AUTOMATION A4133251 / A4133251
METSO AUTOMATION A413383 / A413383
METSO AUTOMATION A413744 / A413744
METSO AUTOMATION A416293 / A416293
METSO AUTOMATION A4400007D / A4400007D
METSO AUTOMATION A4400007D / A4400007D
Metso Automation ADC5483-D200418 Power Supply Module 115/230Vac In 28Vdc Out
METSO AUTOMATION AG193 / AG193
METSO AUTOMATION AG193 / AG193
METSO AUTOMATION AG194 / AG194
Metso Automation AIU-8 Analog Input Module A413125 Rev. 0 Valmet PLC Board AIU8
Metso Automation AIU-8 Analog Input Module A413125 Rev. 10 Valmet PLC Board AIU8
Metso Automation AIU-8 Analog Input Module A413125 Rev. 21 Valmet PLC Board AIU8
Metso Automation AIU-8 Analog Input Module A413125 Rev. 22 Valmet PLC Board AIU8
METSO AUTOMATION APS002 / APS002
Metso Automation APS002 046823 CCI Power Supply 24 VDC PLC Module Rev B no cover
METSO AUTOMATION BIU-8 / BIU8
Metso Automation BIU-82 Binary Input Module A413141 Rev. 10 Valmet PLC BIU82
Metso Automation BIU-84 Binary Input Module A413143 Rev. 07 Valmet PLC BIU84
Metso Automation BIU-84 Binary Input Module A413143 Rev. 09 Valmet PLC BIU84
Metso Automation BOU-8 Binary Output Module A413150 Rev. 15 Neles Valmet BOU8
METSO AUTOMATION BOU-83 / BOU83
METSO AUTOMATION C3247-000-00008 / C324700000008
METSO AUTOMATION C3320-000-10001 / C332000010001
METSO AUTOMATION D100532 02 / D10053202
Metso Automation D100644 Rev. 05 EFC Ethernet Coax Field Bus Converter Valmet
METSO AUTOMATION D100789 / D100789
METSO AUTOMATION D200533 / D200533
METSO AUTOMATION D200533 / D200533
METSO AUTOMATION D200535 / D200535
METSO AUTOMATION D200535 / D200535
METSO AUTOMATION D200536 / D200536
Metso Automation D200566 Rev. 0 CATx KVM Extender Valmet
Metso Automation D201126 DI8 Digital Input Module PLC DI8P Rev. 06
Metso Automation D201134 AI8 Analog Input Module PLC AI8C Rev. B
Metso Automation D201136 AO4 Output Module PLC AO4C Rev. 08 A04
Metso Automation D201138 IBC Controller Module Rev. C Neles Valmet PLC
Metso Automation D201138 IBC valmet Automation Neles
Metso Automation D201171 TI4 Input Module PLC TI4W4 Rev. 8.10
Metso Automation D201351 RES Module PLC Reserve Filler Rev. 02
Metso Automation D201471 Revision 05 DOI4 Module DOI4RO
Metso Automation D201475 Revision B AII4 Module AII4H
Metso Automation D201485 Revision 05 MBI8 Module PLC 8-Slot Rack Chassis
Metso Automation D201784 MBM-80 PLC Module Rack Backplane Rev. 06 Neles Valmet
Metso Automation D201785 MBS-80 PLC Module Rev. 03 Neles Valmet
Metso Automation D201822 Revision 06 DII8U120 DII8 Power Module
Metso Automation D201962 MBM-120 PLC Module Rack Backplane Rev. 08 Neles Valmet
Metso Automation EDS-408A-MM-SC Ether-Device Switch Module 24 VDC Neles Valmet
METSO AUTOMATION EL034 / EL034
METSO AUTOMATION ELO24 / ELO24
Metso Automation HD Node Module D200623 Controller Valmet A1A1/AC01
Metso Automation IOP115 081804 Rev E/F RTD Input Module 4C2&4B1
Metso Automation IOP116-4W 064594 Output Driver Module Rev A/A 064314 4C2
Metso Automation IOP117-4W 064314 Output Driver Module Rev K1/P PLC 4B1
Metso Automation IOP118 081820 Relay Output Module Rev B1/E 4C2
Metso Automation IOP125-6WT 081825 Relay Driver Module Rev A/B 4C2
METSO AUTOMATION IOP301 / IOP301
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