描述
面向?qū)ο缶幊淌怯?jì)算機(jī)高級(jí)語(yǔ)言的一種先進(jìn)的編程模式,在工業(yè)控制系統(tǒng)的PLC程序中也可以采用這種設(shè)計(jì)思想,雖然我們無(wú)法實(shí)現(xiàn)面向?qū)ο蟮暮芏鄡?yōu)秀特點(diǎn)如“繼承”,甚至于它根本就不具備面向?qū)ο缶幊陶Z(yǔ)言的特點(diǎn),但面向?qū)ο缶幊痰幕靖拍罹褪穷惡皖惖膶?shí)例(即對(duì)象),我們只需要使用這種概念就可以了。在計(jì)算機(jī)編程中我們需要把一些事物抽象和歸納,才能編寫類,而在工業(yè)控制系統(tǒng)中,控制對(duì)象如:電機(jī),閥等等是很明顯的控制類別,不需要抽象就可以很明顯的針對(duì)它們編寫類,以下將會(huì)用到西門子的Step7編程語(yǔ)言和施奈德的Unity編程語(yǔ)言來(lái)講解PLC的面向?qū)ο缶幊獭? 面向?qū)ο缶幊淘赟tep7中使用功能塊(即FB)編程,一談到此大家就會(huì)想到西門子提出的模塊化編程,不錯(cuò),就是這個(gè)模塊化編程,但西門子提出的模塊化、背景數(shù)據(jù)塊、多重背景等名詞并不能讓大家很明白的理解和使用這種優(yōu)秀的設(shè)計(jì)理念。如果大家從面向?qū)ο缶幊痰慕嵌热ダ斫猓瑒t可以很好的理解這種設(shè)計(jì)模式?!癋B塊”被看成“類”,它可以被看成是對(duì)相似的控制對(duì)象的代碼歸納,如對(duì)MM440的變頻器可以編寫FB塊:MtrMM440,這在面向?qū)ο缶幊讨蟹Q為“類”,當(dāng)需要編程控制具體的電機(jī)時(shí),可以給它分配一個(gè)背景DB塊,在面向?qū)ο缶幊讨蟹Q為類的實(shí)現(xiàn)(即創(chuàng)建類的實(shí)例:對(duì)象),當(dāng)需要控制多個(gè)電機(jī)時(shí),可以分配不同的背景DB到這個(gè)FB塊,即創(chuàng)建類的多個(gè)實(shí)例。Step7中有另外一種程序塊,即FC塊,以FC塊為主的編程在西門子中稱為結(jié)構(gòu)化編程,這也可以類比于計(jì)算機(jī)編程中的面向過(guò)程編程,即純粹以函數(shù)為主體的編程。使用這種設(shè)計(jì)模式,可以將程序設(shè)計(jì)分為兩個(gè)階段,即標(biāo)準(zhǔn)庫(kù)、基本架構(gòu)開(kāi)發(fā),以及實(shí)際應(yīng)用層面設(shè)計(jì)。其中標(biāo)準(zhǔn)庫(kù)、基本架構(gòu)是制定程序標(biāo)準(zhǔn)化的基礎(chǔ),而應(yīng)用層設(shè)計(jì)是針對(duì)具體的控制工程編程,這樣可以把程序設(shè)計(jì)人員分成兩類,一類是標(biāo)準(zhǔn)開(kāi)發(fā),由資深程序員負(fù)責(zé),一類是應(yīng)用設(shè)計(jì)(其中程序調(diào)試規(guī)劃到應(yīng)用設(shè)計(jì)),由經(jīng)過(guò)標(biāo)準(zhǔn)化培訓(xùn)的一般程序員完成,通過(guò)這種分配就可以解決中國(guó)工業(yè)自動(dòng)化中面臨的尷尬局面。傳統(tǒng)的中國(guó)控制工業(yè),一個(gè)程序設(shè)計(jì)由一個(gè)人完成,這樣他還必須負(fù)責(zé)現(xiàn)場(chǎng)調(diào)試,而擁有豐富經(jīng)驗(yàn)的程序員一般是三十歲后,這時(shí)他已經(jīng)成家,而顯然長(zhǎng)期出差對(duì)家庭不利,很多優(yōu)秀的程序員為了家庭考慮不得不改行,要么轉(zhuǎn)到管理崗位,要么去制造工廠搞設(shè)備維護(hù),這是資源的嚴(yán)重流失。毫無(wú)疑問(wèn),使用以上的設(shè)計(jì)流程,我么可以讓經(jīng)驗(yàn)豐富的程序員搞標(biāo)準(zhǔn)庫(kù)和架構(gòu)的設(shè)計(jì),而讓剛踏入這個(gè)行業(yè)的年輕人搞應(yīng)用設(shè)計(jì)和調(diào)試,這不僅可以讓老程序員繼續(xù)他自己的工作,而不影響家庭,也可以讓年輕的程序員參入現(xiàn)場(chǎng)調(diào)試,培養(yǎng)自己的經(jīng)驗(yàn),提高自己的收入。
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢(shì)價(jià)格,大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂(lè)。ACSO,橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家
RADIAL PISTON PUMP # H20H-F2 AND H20L-F2
RADIAL PISTON PUMP # HEO55-F2
VICKERS VANE PUMP REMAN VVB032F-PW-20CB?W12/V101S5S11A2?0
SAUER SUNDSTRAND 90M100 HYDRAULIC PISTON MOTOR
RACINE HYDRAULIC PUMP MODEL#PSV-PSAF-?15ERM-56 REMAN/NEW
RACINE HYDRAULIC PUMP MODEL#PSV-PSAF-?10HRM-56 REMAN/NEW
RACINE HYDRAULIC PUMP MODEL#PSV-PSSF-?10HRM-56 REMAN/NEW
RACINE HYDRAULIC PUMP MODEL#PSV-PSSF-?15ERM-56 REMAN/NEW
CONTINENTAL PUMP NEW #PVR1530B10RFO5?21D
RACINE PSQ-PSSF-09ERM-?20 HYDRAULIC VANE PUMP NEW
CONTINENTAL VALVE VS100M-3A-G3B5H?L2-60L-G D10 – 1 1/4
NORTHMAN VALVE SW-G10-C4-A120-?10 NEW SURPLUS D10 -1 1/4
CONTINENTAL PUMP NEW #PVR68B06RFO12H
BOSCH 0811-403-114 NG6 PROPORTIONAL FLOW CONTROL
REBUILT RACINE VANE PUMP # PVS-PSSO-12ER-0?1
NACHI FLOW CONTROL # FG10-373-20 NEW NEVER USED
CONTINENTAL VANE PUMP MODEL# PVR1520B15RMP13?JY5518-1
VICKERS HYDRAULIC VANE PUMP REBUILT #45V42A1C22R
CONTINENTAL MANIFOLD MOUNTED VANE PUMP
OIL GEAR PISTON PUMP NEW SURPLUS W/1 YEAR WARRANTY
REXROTH PROPORTIONAL DIRECTIONAL VALVE REMAN
ROTAC HYDRAULIC ROTARY ACTUATOR MODEL# MPJ34-2V REMAN
VICKERS REMAN VANE PUMP #V2106A DOUBLE SHAFT
BOSCH VALVE NG6 PROPORTIONAL RELIEF MODEL#0811-402-?030
BOSCH D05 DIRECTIONAL VALVE #9810-232-138 110V COILS
VICKERS PUMP REMAN MODEL# V104-G-10 W/1 YEAR WARRANTY
VICKERS VANE PUMP REBUILT FIXED DISP. #25VQ12A11B20
PVR1-6B10-RMP6H?2 NEW CONTINENTAL PUMP
PVR1-6B10-RMP6H?2 NEW SURPLUS CONTINENTAL PUMP
HEYPAC HYDRAULIC DOUBLE ACTING PUMP #GX40-NSNW1 REMAN
RELIANCE ELECTRIC MOTOR NEW ID#P56H1332H
GRESEN DIRECTIONAL VALVE
PARKER D63W1D4Y33 D08 DIRECTIONAL VALVE REMAN
PARKER D63W1B45Y36 D08 DIRECTIONAL VALVE REMAN
PARKER VALVE #D63W1C456Y34 REMAN D08 DIRECTIONAL
VICKERS HIGH SPEED VANE MOTOR NEW SURPLUS #M2335751C13
PACO PUMP CAT# 101250110006122?12 SER#SPE15049-10?02 NEW
PARKER HYDRAULIC ACTUATOR HTR9-18030-BD11?W-A NEW
TUTHILL HYDRAULIC PUMP MODEL# 1RC-RH X191A
RACINE VALVE #FE1-PBAE-T06W-?10 PRESSURE CONTROL NEW
MOOG VALVE SELLING AS-IS MODEL#D642-515A?/SN#D601
MOOG VALVE SELLING AS-IS MODEL#D644-519/?SER#D284
MOOG VALVE SELLING AS-IS MODEL#D642-515A?/SER#D647
WANDFLUH HYDRAULIC VALVE MODEL# AMW4D102 NEW
WANDFLUH HYDRAULIC VALVE D03 MODEL# AMW4D62 NEW
PARKER/NICHOLS MOTOR NEW SURPLUS #050-2-AS-H8-12?48
CHARLYNN/EATON HYDRAULIC MOTOR #103-1022-010 NEW
CO-AX VALVE PART#FL06680/MO?D.#VSVF502C216G?GD50120VXXXP1
VICKERS VALVE#DG4V32AMS?6UH760 NEW VALVES NEVER USED
PARKER HYDRAULIC CYLINDER NEW #CC2HLU18AC 3000PSI
WHITE HYDRAULICS MOTOR#200250A11?02AAAAA NEW SURPLUS
VICKERS HTLS MOTOR NEW SURPLUS # HMA-1030-APO10
VICKERS VALVE D03 NEW SURPLUS MODEL#DG4V32AMF?PA5WLB660
VICKERS D03 VALVE NEW SURPLUS #DG4V3S6NMFPA5W?LH560
VICKERS VALVE D03 NEW SURPLUS DG4V3S6CMFPA5WL?B560
VICKERS VALVE#DG4S2LW01?2AB60 DIRECTIONAL VALVE
REXROTH VALVE MODEL# 4WE6D60OFEG24N9?Z45 D03 REMAN
NACHI VALVE MODEL# SA-G01-C5-C1-30 D03 DIRECTIONAL
VICKERS VANE PUMP REMAN MODEL#V102P2P1C?20
VICKERS VANE PUMP REMAN MODEL#V102P3P10?A20
VICKERS VANE PUMP REMAN MODEL#V102P3P10?A20
VICKERS VANE PUMP REMAN MODEL#V102P3P1D?20 FIXED PUMP
VICKERS HYDRAULIC VANE PUMP REMAN MODEL#V102P2P1C?20
PARKER AIR CYLINDER SER. 2AN #02.00KJTC2ANU3?4A39A1.00
PARKER HYDRAULIC CYLINDER SER. 2H #01.50CJJ2HTV19?AC2.00
PARKER HYDRAULIC CYLINDER SERIES 2H #02.00C2HLT14A2?.000
PARKER HYDRAULIC CYLINDER SERIES 3L #02.50CD3LLU14A?C5.0
BOSCH VALVE 0811-101-272 RELIEF MODULE D05 PATTERN NEW
REXROTH CONTROL COVER MODEL#LFA25H4-7?0/F/12 NEW SURPLUS
BOSCH UNIVERSAL CHASSIS 2 SLOT CARD HOLDER
REXROTH DIRECTIONAL VALVE REMAN
WANDFLUH HYDRAULIC VALVE D05 MODEL# AMW42100A NEW
BOSCH VALVE 9810-161-190 RELIEF MODULE D03 PATTERN
PARKER D3W4CNJC56 DIRECTIONAL VALVE
VICKERS VANE PUMP MODEL#V201P6S1A?11 REMAN
HJC CL-12 SNOWMOBILE HELMET ADULT SIZE LIKE NEW
PARKER DIRECTIONAL VALVE NEW IN BOX
PARKER VALVE #D41FHB61F2VB00?35 USED AS-IS
PARKER FLOW CONTROL NEW IN BOX
FESTO PNEUMATIC CYLINDER DNC-50-50PPV-A NEW
FESTO PNEUMATIC CYLINDER DNC-40-151-PPV-?A NEW
ROSS PNEUMATIC VALVE W7016A2332 NEW
ROSS PNEUMATIC VALVE MODEL# 2751A5001 NEW
NACHI HYDRAULIC VALVE MODEL# SA-G01-C6-C115-?E31 NEW DO3
PARKER CYLINDER NEW NEVER USED.
BOSCH #0521-220-004 NEW HYDRAULIC VALVE
FESTO PNEUMATIC CYLINDER NEW DNC-50-50PPV-A
FESTO PNEUMATIC CYLINDER NEW DNC-40-151-PPV-?A
WEBSTER PUMP MODEL#30B1J3HX-?7L REMAN W/ 1 YEAR WARRANTY
PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家