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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。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(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(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、。

（1）低檔PLC

低檔PLC具有邏輯運算、定時、計數(shù)、移位以及自診斷、監(jiān)控等基本功能，還可有少量模擬量輸入/輸出、算術(shù)運算、數(shù)據(jù)傳送和比較及通信等功能，主要用于邏輯控制、順序控制或少量模擬量控制的單機控制系統(tǒng)。

HONEYWELL APT2000 CC-0-00 Conductivity Transmitter (NEW in BOX)
HONEYWELL AQ25242B / AQ25242B (BRAND NEW)
HONEYWELL AQ25244B / AQ25244B (BRAND NEW)
HONEYWELL AQ475A1004 / AQ475A1004 (NEW NO BOX)
HONEYWELL AR25BDN2050 / AR25BDN2050 (USED TESTED CLEANED)
Honeywell Assy 4DP7APXDH 511200 Fw Rev A DATA Highway I/F Control Board
Honeywell Assy no 51401642-150 E High Perbance I/O Link Card 51401642150
Honeywell Assy No. 30752588-001 PLC Board Card 8KXI7 CMOS RAM
Honeywell Assy No. 51309175-001 Rev D2 For UDC6300 Digital Controller
Honeywell Assy No. 51309178-001 Rev A3  For UDC6300 Digital Controller
Honeywell Assy No. 51309178-001 Rev A3 For UDC6300 Digital Controller
HONEYWELL ATG-2PCA / ATG2PCA (USED TESTED CLEANED)
Honeywell Battery Backup Backplane 30734501-001 60 DAY WARRANTY!
HONEYWELL BEAM1224 / BEAM1224 (USED TESTED CLEANED)
HONEYWELL BF4CHM / BF4CHM (USED TESTED CLEANED)
HONEYWELL BF4MDC 60130571 HEDP-G 60130572-001 ACCURAY 085156-001 2-085155-001
HONEYWELL BPNL150B-001 INTERFACE CONTROL DISPLAY 60127728-002 BX2CP HEDPG
HONEYWELL BURNER CONTROL RM7800 M 1011,DYNAMIC R7847C1005 ,ST7800A1005, BY
HONEYWELL BURNER CONTROL RM7800 M 1011,DYNAMIC R7847C1005 ,ST7800A1039, BY
HONEYWELL BURNER CONTROL RM7840M1017,ST7800A1005,R7847C1005,Q7800A1005,EY
Honeywell Burner Control Ultraviolet Flame Amplifier ec7850 a 1122
HONEYWELL BXC4S / BXC4S (BRAND NEW)
HONEYWELL C072 / C072 (NEW IN BOX)
HONEYWELL C32211 / C32211 (NEW NO BOX)
Honeywell C6045D 1050 1 Air/Gas Pressure Switch C6045D10501 (Pack of 6)
HONEYWELL C7012A-1160 FLAME DETECTOR used tested shutter is working perfect
HONEYWELL C7012A-1160 FLAME DETECTOR used tested shutter is working perfect
HONEYWELL C7061A-1012 FLAME DETECTOR used tested shutter is working perfect
HONEYWELL C7061A-1012 FLAME DETECTOR used tested shutter is working perfect
Honeywell C7061A1020 UV Flame Detector C7061A1020 Free Expedited Shipping
HONEYWELL C-AF000 / CAF000 (NEW IN BOX)
HONEYWELL CARD DMA 4DP7AXDH 233(A) *NEW NO BOX*
HONEYWELL CC-PDIL01 / CCPDIL01 (USED TESTED CLEANED)
Honeywell CC-PDOB01 Digital Output 24V
Honeywell CC-PDOB01 P/N: 51405043-176 digital output 24V module
HONEYWELL CC-PFB401 / CCPFB401 (USED TESTED CLEANED)
HONEYWELL CC-PSV201 / CCPSV201 (USED TESTED CLEANED)
HONEYWELL CCR30-ISO-IRMS MODULE 65876983
HONEYWELL CCR30-ISO-IRMS MODULE 65876983 Type ELFD P/N: 65876983
HONEYWELL CCT722B / CCT722B (BRAND NEW)
HONEYWELL CC-TAIX01 / CCTAIX01 (USED TESTED CLEANED)
HONEYWELL CC-TAIX11 / CCTAIX11 (NEW IN BOX)
Honeywell CC-TDIL01 Digital Input Board 24v-dc Rev C2
Honeywell CC-TDOB01 I/O BOARD P/n: 51308371-175
Honeywell CC-TDOB01 I/O BOARD P/n: 51308371-175
Honeywell CC-TDOB01 I/O BOARD P/n: 51308371-175 New Unused
HONEYWELL CC-TFB401 51308309-175 NUPI
HONEYWELL CC-TFB402 / CCTFB402 (NEW IN BOX)
HONEYWELL CENTRA MCR 200 MCR200  MCR 200-62 MCR20062
HONEYWELL CENTRA MCR 200 MCR200 MCR 200-62 MCR20062
HONEYWELL CHG-120 / CHG120 (USED TESTED CLEANED)
HONEYWELL CHS5500WF6002 / CHS5500WF6002 (BRAND NEW)
HONEYWELL CLSB9T-BHP-C / CLSB9TBHPC (BRAND NEW)
HONEYWELL CLSXB4T / CLSXB4T (BRAND NEW)
HONEYWELL CLSXB9T-E1 / CLSXB9TE1 (BRAND NEW)
HONEYWELL CLSXE1A / CLSXE1A (BRAND NEW)
Honeywell Coke Feeder Circuit Board WFC1002 120V
Honeywell Conductivity Cell 04973-X01 Module PLC DCS Transmitter Transducer
Honeywell Conductivity Cell 04973-X01 Module PLC DCS Transmitter Transducer   
HONEYWELL CONTROL BOARD 30676602-001 *NEW IN BOX*
Honeywell Control Network Module 620-0038 new
Honeywell Controller XL50
Honeywell ControlNet Repeater Adapter TC-RPA002 NIB
HONEYWELL CP-5801 / CP5801 (USED TESTED CLEANED)
HONEYWELL CP-5802 / CP5802 (USED TESTED CLEANED)
HONEYWELL CP980E1060 / CP980E1060 (BRAND NEW)
HONEYWELL CP-EXPIO / CPEXPIO (NEW IN BOX)
HONEYWELL CP-EXPIO / CPEXPIO (NEW NO BOX)
Honeywell CP-EXPIO ComfortPoint BACnet DDC Solution CPEXPIO New
HONEYWELL CP-IPC / CPIPC (USED TESTED CLEANED)
HONEYWELL CP-SPC / CPSPC (NEW NO BOX)
HONEYWELL CP-SPC / CPSPC (USED TESTED CLEANED)
HONEYWELL C-STC61 / CSTC61 (NEW IN BOX)
HONEYWELL C-TCB YAMATAKE TERMINAL PANEL CONTROLLER FOR C-TCB20,30751315-001,DJ
Honeywell D254.DIN.110.US  Lamp Dimmer 01-9918
Honeywell D254.DIN.110.US Lamp Dimmer 01-9918
HONEYWELL D41997-01 / D4199701 (USED TESTED CLEANED)
Honeywell DC100-8002 Temperature Controller
HONEYWELL DC200C-2-00F-100000-0 UNIVERSAL DIGITAL CONTROLLER UDC2000 MINI PRO
HONEYWELL DC200E-0-210-1F0000-0 UNIVERSAL DIGITAL CONTROLLER UDC2000 MINI PRO
HONEYWELL DC230B-CE-0A-10-0000000-00-0 NSMP
HONEYWELL DC230B-CE-0A-10-0000000-E0-0 NSNP
HONEYWELL DC230B-TE-00-10-0000000-00-0 NSMP
HONEYWELL DC230B-TE-00-10-0000000-00-0 NSNP
HONEYWELL DC230L-EE-20-20-0A00000-00-0 TEMPERATURE CONTROLLER*NEW NO BOX*
HONEYWELL DC300E-E-000-20-BF00-0 TEMPERATURE CONTROLLER *USED*
HONEYWELL DC300E-E-000-22-000-0 TEMPERATURE CONTROLLER * NEW NO BOX *
HONEYWELL DC300E-E-2A0-22-0000-0 TEMPERATURE CONTROLLER  * NEW NO BOX *
HONEYWELL DC300E-E-2A0-22-0000-0 TEMPERATURE CONTROLLER * NEW NO BOX *
HONEYWELL DC300K-E-103-21-0A00-0 TEMPERATURE CONTROLLER * USED *
HONEYWELL DC300K-E-2A3-21-0A00-0 / DC300KE2A3210A000 (USED TESTED CLEANED)
Honeywell DC5062-0-0A00-200-00-0211 Ultra Pro Controller UDC5000 New
Honeywell DCP 25 Controller (Brand New)
Honeywell DCS PLC TC-CCN012 Net Interface Module Transducer Transmitter Meter
Honeywell DCS PLC TC-CCN012 Net Interface Module Transducer Transmitter Meter 
Honeywell DCS PLC TC-CCR013 Net Interface Module Transducer Transmitter Meter
Honeywell DCS PLC TC-CCR013 Net Interface Module Transducer Transmitter Meter 
HONEYWELL DIA-2020 / DIA2020 (USED)
Honeywell Digital Controller SDC 3-10PC Heater Control
Honeywell Digital Controller SDC 3-10PC Heater Controller
HONEYWELL DM106-0-B-00-A-R-1-00000-000-00 / DM1060B00AR10000000000 (USED TESTED
HONEYWELL DM106-0-B-00-A-R-1-00000-000-00 / DM1060B00AR10000000000 (USED TESTED
HONEYWELL DM106-0-B-00-A-R-1-00000-000-E0 / DM1060B00AR100000000E0 (USED TESTED
HONEYWELL DM106-0-B-00-A-R-1-00000-000-E0 / DM1060B00AR100000000E0 (USED TESTED
HONEYWELL DMCH02561110A1-35 / DMCH02561110A135 (USED TESTED CLEANED)
HONEYWELL DMX-PE42 / DMXPE42 (USED TESTED CLEANED)
HONEYWELL DPR51-2410-00 / DPR51241000 (USED TESTED CLEANED)
HONEYWELL DR4200GP2-00-GG00000 CHART RECORDER *USED*
HONEYWELL DR4300 DR4301-0000-B0100-0000-0000-U0-000_AS-PICTURED_GREAT DEAL_$$$!~
HONEYWELL DS06-105-DUS-LF / DS06105DUSLF (BRAND NEW)
HONEYWELL DS06-105-DUT-LF / DS06105DUTLF (BRAND NEW)
HONEYWELL DSP3956 / DSP3956 (BRAND NEW)
HONEYWELL E3DA / E3DA (BRAND NEW)
HONEYWELL E3DM / E3DM (BRAND NEW)
Honeywell E42009287-0642 Power Supply Board E420092870642
HONEYWELL EC7850 A 1080 BURNER CONTROL Digital Display
HONEYWELL EC7850 A 1080 BURNER CONTROL Digital Display
HONEYWELL EC-F9-NH3 / ECF9NH3 (USED TESTED CLEANED)
HONEYWELL EC-FX-NH3-LR / ECFXNH3LR (BRAND NEW)
Honeywell Echelon 1250 Router Model 40222
HONEYWELL EMD/DM/LGC/J/0-999F/SCT/N/0-10VDC / EMDDMLGCJ0999FSCTN010VDC (USED TES
HONEYWELL EMM-ST/N/01 / EMMSTN01 (USED TESTED CLEANED)
Honeywell EPDG 51401286-100 HDW J FW K Enhanced Peripheral Display Generator PLC
HONEYWELL EXD-AR20-3 / EXDAR203 (BRAND NEW)
Honeywell Expansion Module FF-SRE3081E _ FFSRE3081E _ 120V AC _ 50/60 HZ
HONEYWELL F300B2012 / F300B2012 (BRAND NEW)
HONEYWELL F300E1001 / F300E1001 (BRAND NEW)
HONEYWELL F300E1019 / F300E1019 (BRAND NEW)
HONEYWELL F300E1027 / F300E1027 (BRAND NEW)
HONEYWELL F56103101 / F56103101 (USED TESTED CLEANED)
Honeywell FC THERM BOARD 05428901 Rev. A
HONEYWELL FCPS-24FS6 / FCPS24FS6 (NEW IN BOX)
Honeywell FC-RUSIO3224 Remote Universal Safe I/O
HONEYWELL FC-TPSU-2430 / FCTPSU2430 (NEW IN BOX)
HONEYWELL FC-TSDI-1624 NUPI
HONEYWELL FE-MLS2E-5C / FEMLS2E5C (NEW NO BOX)
HONEYWELL FE-MLS2R-5C / FEMLS2R5C (NEW NO BOX)
HONEYWELL FE-MLSTR3 / FEMLSTR3 (NEW IN BOX)
HONEYWELL FE-TR3 / FETR3 (NEW IN BOX)
HONEYWELL FE-TR4-2 / FETR42 (NEW IN BOX)
HONEYWELL FE-TR5 / FETR5 (USED TESTED CLEANED)
HONEYWELL FF3-20-AC-03 / FF320AC03 (BRAND NEW)
HONEYWELL FFS-11-QD05 / FFS11QD05 (BRAND NEW)
HONEYWELL FF-SADL78RE / FFSADL78RE (USED TESTED CLEANED)
HONEYWELL FF-SB14E124-S2 / FFSB14E124S2 (USED)
HONEYWELL FF-SB14E14K-S2/3 / FFSB14E14KS23 (USED TESTED CLEANED)
HONEYWELL FF-SPR47TRG / FFSPR47TRG (USED TESTED CLEANED)
HONEYWELL FFSRO5936E / FFSRO5936E (NEW IN BOX)
HONEYWELL FF-SYA30048Q2 / FFSYA30048Q2 (USED)
Honeywell Flame detectors Ultraviolet C7012E 1104 New no box
HONEYWELL FMA112AV / FMA112AV (NEW IN BOX)
HONEYWELL FMF111-AV / FMF111AV (USED TESTED CLEANED)
Honeywell FSC 10002/1/2 Run Stop with Key Selector Module
HONEYWELL FSC 10006/2/1 Diagnostic and battery module (DBM)
HONEYWELL FSC 10105/2/1 Fail-safe HD analog b module (24 Vdc, 16 channels)
HONEYWELL FSC 10208/1/1 Relay output module (contacts, 12 channels)
HONEYWELL FSD-751PL / FSD751PL (USED TESTED CLEANED)
HONEYWELL FSD-751RPL / FSD751RPL (USED TESTED CLEANED)
HONEYWELL FSP1535 / FSP1535 (NEW NO BOX)
HONEYWELL G3L-CUEA PRAGRAMMABLE LOGIC CONTROLLER MODULE - FREE SHIPPING -
HONEYWELL GKDB2K2 / GKDB2K2 (BRAND NEW)
HONEYWELL GKFE16LXA2 / GKFE16LXA2 (BRAND NEW)
HONEYWELL GKLA14P6A2-FW / GKLA14P6A2FW (NEW NO BOX)
HONEYWELL GKLA-40F1C2-F05-C / GKLA40F1C2F05C (USED TESTED CLEANED)
HONEYWELL GKLG44LXS2 / GKLG44LXS2 (BRAND NEW)
HONEYWELL GKRA-2K1A2-F04 / GKRA2K1A2F04 (USED TESTED CLEANED)
HONEYWELL GKRA40F1C2-F05-C / GKRA40F1C2F05C (USED TESTED CLEANED)
HONEYWELL GKRA-40L6A2-F05 / GKRA40L6A2F05 (NEW IN BOX)
HONEYWELL GMC-755P-G CAMERA
HONEYWELL GMS10-18C / GMS1018C (BRAND NEW)
HONEYWELL GSXA22A1A / GSXA22A1A (BRAND NEW)
HONEYWELL H4D5S2 / H4D5S2 (NEW IN BOX)
HONEYWELL HB546-BVSR-DKSN-15B2-000 / HB546BVSRDKSN15B2000 (NEW NO BOX)
HONEYWELL HC 900 CONTROLLER  900R12-000112 (12 I/O SLOT RACK )
HONEYWELL HC 900 CONTROLLER 900R12-000112 (12 I/O SLOT RACK )
HONEYWELL HC900 10420F-0021 PLC OPERATOR INTERFACE 24VDC
HONEYWELL HC900 Controller 900C32-0244-00 C30 CPU 72-1
Honeywell hc900 controller 900psm-0001 module
Honeywell hc900 controller 900rr0-0001 plc rack
HONEYWELL HC900 CONTROLLER C30 CPU 900C32-0124-00 Upgraded to Revision 4.406
HONEYWELL HC900 CONTROLLER C30 CPU 900C32-0244-00 Upgraded to Revision 4.406
Honeywell HC900 Controller Open Box Brand NEW
HONEYWELL HFM5100-EAM / HFM5100EAM (NEW IN BOX)
HONEYWELL HFM5100-FAM / HFM5100FAM (NEW IN BOX)
HONEYWELL HMR3300 DEMO / HMR3300DEMO (BRAND NEW)
Honeywell Honeywell DCS 51304485-150 MC-PDIX02 DI IOP
HONEYWELL HPFF8CM / HPFF8CM (NEW IN BOX)
HONEYWELL HRGX161 / HRGX161 (USED TESTED CLEANED)
HONEYWELL HVFD2D3B0040 / HVFD2D3B0040 (BRAND NEW)
HONEYWELL HVFD2D3B0050 / HVFD2D3B0050 (BRAND NEW)
HONEYWELL HVFD2D3C0040E2 / HVFD2D3C0040E2 (BRAND NEW)
HONEYWELL HVFD2D3C0050 / HVFD2D3C0050 (BRAND NEW)
HONEYWELL HVFD2D3C0050E2 / HVFD2D3C0050E2 (BRAND NEW)
HONEYWELL HVFD2D3C0075E2 / HVFD2D3C0075E2 (BRAND NEW)
HONEYWELL HVFD2D3F0030 / HVFD2D3F0030 (BRAND NEW)
HONEYWELL HVFD2D3F0050 / HVFD2D3F0050 (BRAND NEW)
HONEYWELL HVFDSD3A0007G100A / HVFDSD3A0007G100A (BRAND NEW)
HONEYWELL HVFDSD3A0010G100A / HVFDSD3A0010G100A (BRAND NEW)
HONEYWELL HVFDSD3A0015G100A / HVFDSD3A0015G100A (BRAND NEW)
HONEYWELL HVFDSD3C0015G100A / HVFDSD3C0015G100A (BRAND NEW)
HONEYWELL HVFDSD3C0020G100A / HVFDSD3C0020G100A (BRAND NEW)
HONEYWELL HVFDSD3C0030G100A / HVFDSD3C0030G100A (BRAND NEW)
Honeywell I/O Ipc 621-9937
HONEYWELL I/O LINK EXTENDER 51304532-100 REV
HONEYWELL I/O LINK EXTENDER 51304532-100 REV
Honeywell I/O Rack Power Supply, 621-9933C (US)
HONEYWELL IAQ-DAV-TRH-D / IAQDAVTRHD (BRAND NEW)
HONEYWELL IAQ-DNC-TRH-D / IAQDNCTRHD (BRAND NEW)
HONEYWELL IAQ-DNV-D / IAQDNVD (BRAND NEW)
HONEYWELL ICM-4 / ICM4 (NEW IN BOX)
HONEYWELL ICM-4 / ICM4 (NEW NO BOX)
HONEYWELL INPUT/OUTPUT LINK MODULE 51201557-350 REV. F
Honeywell io b extender c en p2011045 dc br12w23 p0903 assy no 5130441
HONEYWELL IO-16-485 / IO16485 (NEW IN BOX)
HONEYWELL IO-16-REM-H / IO16REMH (BRAND NEW)
HONEYWELL IO-R-16 / IOR16 (NEW IN BOX)
Honeywell IPC 1000 IPC1000 Programmable Temperature Controller
Honeywell Ipc 620-16 Control Processor Module 620-1633C
Honeywell IPC 620-16 control processor modules 620-1633C
Honeywell Ipc 621 I/O Rack Power Supply 621-9934
Honeywell IPC 621 System Diagnostic Module 621-0004 SDM
Honeywell IPC 621-6551 Output Module 24v Unused Original Box
Honeywell IPC Automation Systems Processor Power Supply Module 620-0083
Honeywell IPC Automation Systems Processor Power Supply Module 620-0083
Honeywell Isolated Analog Input 321-0022R, 321-0022 R
HONEYWELL ISSC 300-LC2A/2 PROCESSOR CARD 300-LC2A-2 300LC2A2 REPAIRED
HONEYWELL IZM-8 / IZM8 (NEW IN BOX)
HONEYWELL J-HCX00 / JHCX00 (NEW NO BOX)
HONEYWELL J-PF200 / JPF200 (USED TESTED CLEANED)
Honeywell Kat CNC Axis, 622-3020A (US)
Honeywell Kat CNC CPU, 622-3010 (US)
HONEYWELL KDM-R2 / KDMR2 (USED TESTED CLEANED)