无码国产精品一区二区免费16-奶头好大揉着好爽视频-亚洲人成网站在线观看播放-国产日韩精品suv-国产精品日韩欧美一区二区三区

PR6424-000-030 PR6424-000-030  

PLC實質(zhì)上是一種工業(yè)控制計算機，PLC與計算機的組成十分相似。只不過它比一般的計算機具有更強的與工業(yè)過程相連接的接口，以及更直接的適應(yīng)控制要求的編程語言。從硬件結(jié)構(gòu)看，它由CPU、存儲器、輸入/輸出接口、電源等組成。PLC的基本組成框圖如圖1所示。下面對PLC控制系統(tǒng)的主要硬件部分進行介紹。

手機

： 

 Qq:

鄭娟萍

廈門仲鑫航自動化設(shè)備有限公司

  1）、*處理器（CPU）
    一般由控制器、運算器和寄存器組成，這些電路都集成在一個芯片內(nèi)。CPU通過數(shù)據(jù)總線、地址總線和控制總線與存儲單元、輸入/輸出接口電路相連接。
    與一般的計算機一樣，CPU是整個PLC的控制中樞，它按PLC中系統(tǒng)程序賦予的功能指揮PLC有條不紊的進行工作。CPU主要完成下述工作：
    （1）接收、存儲用戶通過編程器等輸入設(shè)備輸入的程序和數(shù)據(jù)。
    （2）用掃描的方式通過I/O部件接收現(xiàn)場信號的狀態(tài)或數(shù)據(jù)，并存入輸入映像寄存器或數(shù)據(jù)存儲器中。
    （3）診斷PLC內(nèi)部電路的工作故障和編程中的語法錯誤等。
    （4） PLC進入運行狀態(tài)后，執(zhí)行用戶程序，完成各種數(shù)據(jù)的處理、傳輸和存儲相應(yīng)的內(nèi)部控制信號，以完成用戶指令規(guī)定的各種操作。
    （5）響應(yīng)各種外圍設(shè)備(如編程器、打印機等）的請求。
    PLC采用的CPU隨機型不同而不同， 目前，小型PLC為單CPU系統(tǒng)，中型及大型則采用雙CPU甚至多CPU系統(tǒng)。目前，PLC通常采用的微處理器有三種：通用微處理器、單片微處理器（即單片機）、位片式微處理器。
    2）、 存儲器
    PLC系統(tǒng)中的存儲器主要用于存放系統(tǒng)程序、用戶程序和工作狀態(tài)數(shù)據(jù)。PLC的存儲器包括系統(tǒng)存儲器和用戶存儲器。
    （1）系統(tǒng)存儲器
    系統(tǒng)存儲器用來存放由PLC生產(chǎn)廠家編寫的系統(tǒng)程序，并固化在ROM內(nèi)，用戶不能更改。它使PLC具有基本的功能，能夠完成PLC設(shè)計者規(guī)定的各項工作。系統(tǒng)程序質(zhì)量的好壞很大程度上決定了PLC的性能。
    （2）用戶存儲器
    用戶存儲器包括用戶程序存儲器（程序區(qū)）和數(shù)據(jù)存儲器（數(shù)據(jù)區(qū)）兩部分。用戶程序存儲器用來存放用戶針對具體控制任務(wù)采用PLC編程語言編寫的各種用戶程序。用戶程序存儲器根據(jù)所選用的存儲器單元類型的不同（可以是RAM、EPROM或EEPROM存儲器），其內(nèi)容可以由用戶修改或增刪。用戶數(shù)據(jù)存儲器可以用來存放（記憶）用戶程序中所使用器件的ON/OFF狀態(tài)和數(shù)據(jù)等。用戶存儲器的大小關(guān)系到用戶程序容量的大小，是反映PLC性能的重要指標(biāo)之一。

BROWNING NSS1652 SPUR GEAR 52 TEETH 3/4 BORE ***XLNT***

GOODYEAR 031905Z HORIZON 200PSI  1?" HOSE ***XLNT***

4" x 9" x 1-3/4" BROCHURE HOLDER (LOT OF 15) ***NIB***

SIMONDS WOODCUTTING RED CENTER RIP SAW BLADE ***NIB***

MONARCH 1-1/2" ALUMINUM PANEL CLIPS (LOT OF 20) ***NNB***

HAFELE 637.45.326 LEGS PLASTIC BLACK  (LOT OF 8)  ***NNB***

HAFELE 637.45.326 BELLS PLASTIC BLACK  (LOT OF 25)  ***NNB***

ATE 12BK 4 LUG ROTOR 110-151min. TH. 8mm 36.4  26HC ***XLNT***

STILMEC D48 BRAKE CALIPERS FOR VW 1 PAIR (LOT OF 2) ***XLNT***

INSULTAB HS-105 BLACK HEAT SHRINK TUBING 1/2" X 25' 600V ***NIB***

CONSTANT FORCE SPRING LIFT/TENSIONER **XLNT**

TECHNICAL SPECIALTIES COMPANY 180168 RUBBER GASKET 15" DIAMETER (LOT OF 2) *NNB*

MELISSA LIGHTING OUTDOOR PIER MOUNT  5.75 X 5.75 X 3.5  ***NNB***

47FT≈ POWER CORD REEL WITH PARKER PUSH-LOK CORD 1/2" X 1F 12.5MM  ***XLNT***

THE CARLSON CO./POWER FLO 8.5CK-40-2B CLUTCH ***NNB***

CRL GG38100 100' X 3/8" GLAZING GASKET ROLL ***NIB***

DOUBLE ROW BALL BEARING ROLLER GUIDE (LOT OF 10)  ***NNB***

DOUBLE ROW BALL BEARING ROLLER GUIDE (LOT OF 8)  ***NNB***

THE CARLSON CO./POWER FLO 1184-4 INNER/OUTER TORQUE PLATE ASSEMBLY ***NNB***

MCMASTER-CARR 94290A591 TUBE CONNECTOR (LOT OF 30) ***NIB***

6" SLATWALL SCANNING HOOK (LOT OF 19) ***NNB***

6" SLATWALL SCANNING HOOK (LOT OF 20) ***NNB***

JP WARD 1-1/2 X 1-1/4 PLEATED WIRE ELEMENT/FILTER ***NNB***

MILWAUKEE 1230-31-24S-1X5 PNEUMATIC CYLINDER (LOT OF 2) ***XLNT***

ADM SNEEZEGUARDS EP15 BRUSHED STAINLESS STEEL (GLASS NOT INCLUDED) ***NNB***

6" SLATWALL METAL PEG HOOKS BLACK (LOT OF 10) ***NNB***

6" SLATWALL METAL PEG HOOKS BLACK (LOT OF 7) ***NNB***

8" SLATWALL METAL PEG HOOKS CHROME PLATED (LOT OF 8) ***NNB***

TAISEI KOGYO SFT-24 SUCTION STRAINER ***NIB***

4" SLATWALL METAL HOOKS CHROME PLATED (LOT OF 7) ***NNB***

ALLRED METAL STAMPING AMS.DS.XX.SP D3 ANGLE BRACKET 3X1X1 (LOT OF 20) **NNB**

FILTROIL BU-100 HYDRAULIC FILTER ***XLNT***

HAFELE 251.01.106 FURNITURE BOLT STRAIGHT NICKLE PLATED 50MM (LOT OF 50) **NNB**

FILTROIL BU-100 HYDRAULIC FILTER ***XLNT***

FILTROIL INSTALL KIT FOR HYDRAULIC FILTERS ***NNB***

HAFELE MINIFIX 262.27.949 CONNECTING FURNITURE BOLT (LOT OF 92) **NNB**

HAFELE MINIFIX 262.27.949 CONNECTING FURNITURE BOLT (LOT OF 100) **NNB**

SCANNER HOOK 8" SLATWALL ZINC FINISH (LOT OF 20) ***NNB***

HAFELE 1-1/2 x 9-1/2" PIANO HINGE (LOT OF 10) ***NNB***

VARIABLE SPEED PULLEY 3 SHEAVE STAINLESS STEEL ***XLNT***

HAFELE KEKU BLACK CONNECTOR FEMALE (LOT OF 30) ***NNB***

VARIABLE SPEED PULLEY 3 SHEAVE ALUMINUM ***XLNT***

HAFELE KEKU BLACK CONNECTOR MALE (LOT OF 26) ***NNB***

FILTER-MART CORP. 05-0635 FILTER ***NIB***

V3.0623-26 FILTER ***NIB***

V3.0510-18 FILTER ***NIB***

FERRARI 1566 CONCEALED EUROPEAN CABINET HINGES NO MOUNTING PLATE(LOT OF 24)*NNB*

CRL GSR600CH CHROME PLATED GLASS SHELF RESTS (LOT OF 2) ***NIB***

HAMON DISCHARGE ELECTRODE RAPPER SHAFT INSULATOR **NIB**

BUSCH 532.004.00 FILTER ***NIB***

AIR HANDLER 5W082 PAD HOLDING FRAME 12" X 12" X 1"(BOX OF 3) **NIB**

COOPER P1404040-00207 HIGH PERFORMANCE SPIN-ON FILTER 200PSI MAX ***NIB***

AIR HANDLER 5W082 PAD HOLDING FRAME 12" X 12" X 1"(BOX OF 4) **NIB**

DAYTON 2W435 VACUUM ACCESSORY CARTRIDGE FILTER (LOT OF 2) **NIB**

WIX 46020 AIR FILTER (LOT OF 4) ***NIB***

THOMAS&BETTS 5333 3/4" LIQUIDTIGHT CONDUIT CONNECTOR (BOX OF 8) **NIB**

STEEL CITY HS-102 SNAP-STRAPS 3/4" RIGID CONDUIT (BOX OF 50) **NIB**

WIX 46020 AIR FILTER (LOT OF 3) ***NIB***

EXAIR MODEL 7194 ION AIR JET ***NIB***

MINERALLAC MED45 3/4" 1 HOLE EMT CONDUIT STRAP (BOX OF 100) **NIB**

COOPER CROUSE-HINDS CHICO X4 FIBER FOR SEALING FITTING DAMS **NIB**

HUBBELL 3513-8 3/4" LIQUID-TIGHT STRAIGHT CONNECTOR INSULATED (LOT OF 5) **NIB**

COOPER RE21 CONDUIT HUB REDUCER 3/4"-1/2" (BOX OF 11) **NIB**

15-3/4" DIAM. STAINLESS STEEL 4 BLADE INDUSTRIAL FAN BLADE **NNB**

HAFELE NICOLL 100 B101 PLASTIC WHITE VENT (LOT OF 10) ***NNB***

UNBRACKO 1-1/2" SOCKET CAP SCREW 1-1/2-12X6-1/4 (LOT OF 3) ***NIB***

HERA PORTABLE CABINET LED LIGHT BIG6/2 LED WW 7.2W 350mA CC ***NNB***

KEYSTONE TECHNOLOGIES S115 18" FLUORESCENT LIGHT FIXTURE ***NIB***

HAFELE SIMPLEX 110° CHROME PLATED GLASS DOOR HINGE (LOT OF 2 PAIR (4)) ***NNB***

SIRO DESIGNS 1408-720N1 25-3/16" BAR PULL IN  STAINLESS STEEL **NIB**

HSS27 MAPLE RAIL BLANKS DRILLED 40-3/8" X 6/8" X 1"  (LOT OF 4) *NNB*

COUPLINGS CO. 469FF 1/2 X 1/2 COMP MALE ELBOW BRASS FITTING (BOX OF 10) **NIB**

COUPLINGS CO. 468FF 1/2 X 1/2 COMP MALE CONN. BRASS FITTING (BOX OF 20) **NIB**

COUPLINGS CO. 468FF 1/2 X 1/2 COMP MALE CONN. BRASS FITTING (BOX OF 10) **NIB**

COUPLINGS CO. 468F 1/2 X 3/8 COMP MALE CONN. BRASS FITTING (BOX OF 10) ***NIB***

COUPLINGS CO. 112XF 1/2 HEX NIPPLE CX37150 BRASS FITTING (BOX OF 10) ***NIB***

SIRO DESIGNS 10-3/4" EUROPEAN BAR PULL IN  STAINLESS STEEL **NIB**

HAFELE MAGNETIC CATCH BROWN 4-5KG W/STRIKE (LOT OF 14) ***NIB***

***TEMPLATE*** RANDOM NIB ABC123DEF 1.375" DURAMETALLIC OUTSIDE SEALS ***NIB***

BILSOM QUIETZONE REUSABLE CORDED EARPLUGS 24 DECIBELS ***NIB***

MCMASTER-CARR 93MM ANGLE BRACKET ***NNB***

RICHELIEU 2-1/2" ALUMINUM HD PANEL CLIPS ***NNB***

FARRARI B0610MB30 HINGE PLATE FACE FRAME (LOT OF 15) **NNB**

HAFELE SELF CLOSING EASY-ON HINGE (LOT OF 4) *NNB*

HAFELE KEKU BLACK CONNECTOR MALE (LOT OF 20) ***NNB***

HAFELE HINGE FLAP METAL 90D 35MM (LOT OF 10) ***NNB***

HAFELE MORTISE PULL HANDLE NICKEL/MATTEBLACK (LOT OF 5)

SIRO DESIGNS 1408-560N1 18-7/8" BAR PULL IN  STAINLESS STEEL **NIB**

SIRO DESIGNS 1408-432N1 13-7/8" EUROPEAN BAR PULL IN STAINLESS STEEL **NIB**

SPOTNAILS 2605PG 16 GAUGE GALVANIZED CHISEL POINT STAPLES 15/16" CROWN **NIB**