国产三级伦理在线,久久久久黄久久免费漫画,成人国产精品日本在线,欧美美最猛性xxxxxx

PLC是以微處理器為基礎，綜合了計算機技術、自動控制技術和通信技術，用面向控制過程面向用戶的“自然語言”編程，適應工業環境，簡單易懂、操作方便、可靠性高的新一代通用工業控制裝置。PLC是在繼電器順序控制基礎上發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字運算操作電子系統，專為在工業環境下應用而設計。它采用了可編程序的存儲器，用來在其內部存儲執行邏輯運算、順序控制、定時、計數和算術運算等操作指令，并通過數字的、模擬的輸入和輸出，控制各種類型的機械或生產過程。可編程序控制器及其有關的外圍設備，都應按易于與工業控制系統形成一個整體、易于擴充其功能的原則設計。

PLC產品種類繁多，其規格和性能也各不相同。對于PLC，通常根據其結構形式的不同、功能的差異和I/O點數的多少等進行大致分類。

按結構形式分類

根據PLC的結構形式，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，如圖所示。具有結構緊湊、體積小、價格低的特點。小型PLC一般采用這種整體式結構。整體式PLC由不同I/O點數的基本單元（又稱主機）和擴展單元組成，基本單元內有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；擴展單元內只有I/O和電源等，而沒有CPU。基本單元和擴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，可根據需要選配不同規模的系統，而且裝配方便，便于擴展和維修。大、中型PLC一般采用模塊式結構。

還有一些PLC將整體式和模塊式的特點結合起來，構成所謂的疊裝式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，不但系統可以靈活配置，還可做得體積小巧。

2.2.按功能分類

根據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、移位以及自診斷、監控等基本功能，還可有少量模擬量輸入/輸出、算術運算、數據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。

Nortel NTST09AG BB-STP TRANSITION MODULE. Brand         !
Nortel NTST11FH BB-STP CMPT ENG 3G 40G DSK BD. Brand         !
Nortel NTST14AG CAM FAN/SHELF ASSEMBLY WITH POWER FILTERS. Brand         !
Nortel NTTC01AA Cable Power 8AWG Grounded 1.5M - Bundle of 3
NORTEL NTTL25BF OTM OPTIVITY TELEPHONY MANAGER SOFTWARE
NORTEL NTTL25BF OTM OPTIVITY TELEPHONY MANAGER SOFTWARE
Nortel NTTQ4010 Wlan Handset 2210
Nortel NTTQ4020E6 Avaya 6120 Cordless Phone
NORTEL NTTQ4020E6 WLAN 6120 COMPLETE HOUSING BRAND         
NORTEL NTTQ4021E6 WLAN 6140 COMPLETE HOUSING BRAND         
NORTEL NTTQ4021E6 WLAN 6140 HANDSET REFURBISHED
NORTEL NTTQ4101 POWER SUPPLY FOR 221X CHARGER,         
NORTEL NTTQ4101 POWER SUPPLY FOR WLAN 2210/2211,         
NORTEL NTTQ5060 DESK CHARGER FOR 2211 HANDSETS
Nortel NTTQ5061 WLAN 2211 Desktop Dual Slot Charger - Does Not Include Power Su
Nortel NTU729JA Cable
Nortel NTVH02PA Reunion 48VDC fan
NORTEL NTVQ01BB 13 MC-32 circuit Board
Nortel NTVQ01BB MC 32 Voice Gateway Media Card Rlse 13 SSC System Core Card
NORTEL NTVQ01BB MC-32 VOICE GATEWAY MEDIA CARD
Nortel NTVQ01BB RLSE 13 Voice Gateway Media Card 32
Nortel NTVQ01BB RLSE-13 Meridian ITG-SA Media MC-32 Port W/ NTH403AC / Warranty
NORTEL NTVQ55AA 06 MERIDIAN ITG-P MODULE
Nortel NTYS02AAE6 Model: NTYS02 1110 IP Phone - PoE - No Power Supply
NORTEL NTYS03 1120E TOP HOUISING BRAND         
NORTEL NTYS03BCE6 1120E VOIP PHONE BRAND         
NORTEL NTYS03BCE6 1120E VOIP PHONE          & POWER ADAPTER
NORTEL NTYS05 1140E TOP HOUISING BRAND         
NORTEL NTYS05BA 1140E VOIP TELEPHONE         
NORTEL NTYS05BEE6 1140E VOIP TELEPHONE         
Nortel NTYS20AA70E6 03 Model: NTYS20 1230 PoE IP Phone - No Power Supply
Nortel NTZE04CA Rel. 0011 SNPQA2W2AA
NORTEL NTZK06AA93 Phone M2006 Basic XH09 Grey ! WOW !
Nortel NTZK16BA-93 M2616 Phone with Display
Nortel OEM Cable Adapter A0655007 / HTAG81CA
Nortel OEM Cable Adapter NTAG81CA A0655007
Nortel Office Business 12-Phones Key Telephone System
Nortel Office Business Telephone System Hosted IP VOIP?
Nortel Office Phone (M3903)
NORTEL OPTERA LH OPTICAL C BAND MUX NTCA15NE WMD2AEC
Nortel Optera Metro 3400, Multi Service Platform NTN404KA NTN434AA NTN410GA OC12
Nortel Optera NTCA03FA SNT3E7ECAA OC-192 STM-64 TX DWDM
Nortel OPTERA NTCA05BA STM-64 OC-192 Demultiplexer
Nortel Optera NTCA36BC - Quad OC-12 STM-4 T/R Refurbished
Nortel Option 11 Mini cabinet power supply **REPAIR** NTDK15A, 1 year warranty.
Nortel Option 11 SSC Processor Card - NTDK20JA R. 1 w/ NTTK25CA NTDK22AA
Nortel Option 11 T1 Clock Controller Card Fully Refurbished NTAK20AD
Nortel Option 11 Telephone System (2-Cabinets, w/ Cards)
Nortel Option 11/61/81 Analogue Trunk Card NT5K18AA
Nortel Option 3-Port SDI Cable NTBK48AA
Nortel Option 81 DPRI Cables - 2 of - 10M
Nortel Option M3902 Phone Charcoal - GRADE A + 12 MONTHS WARRANTY
Nortel Option M3902 Phone Charcoal - Refurbished - (VAT & Delivery Included)
Nortel Option Meridian M3903 phone - Black          + VAT & FREE DELIVERY
Nortel Option Meridian M3903 Telephone In Black NTMN33KC70E6 M 3903 Incl VAT/DEL
Nortel Optoelectronic Device MDTL11-20C33 NOS
Nortel Optoelectronic Device MDTL162W5494-135C28
Nortel P0993624 BCM200 Rack Mount Ears With Screws- PN: 010-02067-0002
NORTEL P110097RA-9643/SCHSBF100153 SPEX-HS 34007 NET PC BOARD ***XLNT***
Nortel part # NTBP12EB PASSPORT CONTROLLER PROCESSOR
NORTEL PASSPORT 15000 NTHR09AA COOLING UNIT BACK PLANE
NORTEL PASSPORT 15000 NTHR53BA CABLE ASSEMBLY
NORTEL PASSPORT 15000 NTHR54BA CABLE ASSEMBLY
NORTEL PASSPORT 15000 NTHR55AA CABLE ASSEMBLY
NORTEL PASSPORT 15000 NTHR56AA CABLE ASSEMBLY
NORTEL PASSPORT 15000 NTHR57AA CABLE ASSEMBLY
NORTEL PASSPORT 15000 NTHR66BA CABLE ASSEMBLY
Nortel Passport 4 Port DS1 MVPE FP Card NTNQ89AA
NORTEL PASSPORT 7480 16 SLOT SHELF ASSEMBLY
NORTEL PASSPORT 7480 NTBP16DC V35 PROCESSOR
NORTEL PASSPORT 7480 NTBP16GB V35 PROCESSOR
NORTEL PASSPORT 7480 NTFP18DA
NORTEL PASSPORT 7840 NTJS80BA MSA 32XE1
NORTEL Passport 8006 6 SLOT CHASSIS DS1402002
NORTEL Passport 8010 10SLOT CHAS-ROHS DS1402001-E5
Nortel Passport 8010 DS1404035 - 8648TXE 48 Port Ethernet Routing Switch Circuit
Nortel Passport 8310 8348 TX PWR GTX 8393 SF POE Switch
Nortel Passport 8393SF 8-Channel Fibre Switch PS1404076 SPNEC09AX Circuit Board
NORTEL PASSPORT 8630 GBR DS1404063 ROUTING SWITCH MODULE
Nortel Passport DC Power Supply (NTBP52BA-07)
NORTEL PASSPORT DS1404024 05 8632TXE 32-PORT 10/100 MODULE
NORTEL PASSPORT DS1404025 02 8691SF
NORTEL PASSPORT DS1404034 8616 GTE CLEI IPC8X0GHAA
Nortel Passport NTA093AA - Refurbished - ￡125 + VAT
Nortel Passport NTFP09AB V.11 Termination Panel
NORTEL PASSPORT NTHR21DA 4P0C3 SMIR
NORTEL PASSPORT NTHR35CA CONTROL PROCESSOR CP2
NORTEL PASSPORT NTNN85AA 1 PORT DSI MVPE FUNC PROCESSOR
NORTEL PASSPORT POWER SUPPLY NTBP52BA 07
NORTEL PASSPORT15K FABRIC CD P/N NTHR16DA CLEI BAC7404HAA
Nortel PBX MICS 8 Line 20 T7316 Business Phone System!
Nortel Peripheral Signaling Card Mfr P/N QPC43R
Nortel Phone Coil Cord, 12 foot, Black
Nortel Phone Handset Coil Cord, 12 foot, Platinum Light Grey Gray,         
Nortel Phone M3903 Charcoal
Nortel Phone NTMN33GA70 Digital Model M3903          
Nortel Phone NTMN37BA70 Key-Based Expansion Module (DSS) for Nortel M3904          
Nortel Phone System Package #10 w/Phones & 1yr Warranty
Nortel Phone System Package #9 w/ Phones & 1yr Warranty
Nortel Phone System Switch Cards NT8D03AE
Nortel Phone System With Caller ID, Flash Voice mail and (8) Speaker LCD Phones
Nortel Phone Systems, MG1000, Meridian, 300+ Phones (i2002,1120E, 5316,5008)
Nortel phone T7316 - NT8B2716 Line/Feature/Autodial Keys - with LCD Indicator
Nortel phone T7316 - NT8B2716 Line/Feature/Autodial Keys - with LCD Indicator
Nortel phone T7316 charcoal great condition NT8B27A
Nortel phones
Nortel Pkg Startalk Flash NTAB2385 w/NT5B06EE & NT5B78EB & NT8B83FA-93
NORTEL PLC MODULE PC PACK CALL PROCESSOR CIRCUIT BOARD NT9D19AA CP 68040 48MB
Nortel POE Adapter Power Over Ethernet Inc VAT/DELIVERY
Nortel POE Splitter PD-PS-402 RA-NRTL
Nortel POE Splitter PD-PS-402 RA-NRTL 3 Months Warranty Incl VAT/DEL
Nortel POE Splitter PD-PS-402 RA-NRTL TJ45 Power Jack Separate Adapter Network
Nortel Polycom Conferencing Soundstation Nortel 2501-03308-001
Nortel Polycom Conferencing Soundstation Nortel 2501-03308-001 C
Nortel Polycom IP Audio Conference Phone 2033          , Base Only, NTEX11AA70E6
Nortel Polycom Sound Station 2
Nortel Polycom Sound Station 2501-03308-001D Audio Conferencing Unit - PARTS
Nortel Power Bar Pack of 5 - for BCM 50 with Warranty + VAT & FREE DELIVERY
NORTEL POWER PLANT INTERCONNECT & DISTRIBUTION UNIT MPR15 MFA50 (87)
Nortel Power Supply for IP Phones          in Box NTYS1