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各大進(jìn)口品牌DCS控制備件
AB 1771 1785 1756 1746 1747系列價(jià)格超低
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GE IC697、IC693備件
ABB機(jī)器人控制備件DSQC開(kāi)頭,3H開(kāi)頭的型號(hào)及老系統(tǒng)備件
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各大品牌機(jī)器人控制備件
各大老系統(tǒng)備件及停產(chǎn)備件,專門解決你找不的產(chǎn)品難題
線性程序具有簡(jiǎn)單、直接的特點(diǎn)。編程時(shí),不必考慮功能塊如何編程及如何調(diào)用,也不必考慮如何定義局部變量及如何使用背景數(shù)據(jù)塊。由于所有的指令在一個(gè)塊內(nèi),因此它適用于只需一個(gè)人編寫(xiě)的、相對(duì)簡(jiǎn)單的控制程序。
這是一種部分模塊化的程序結(jié)構(gòu),也稱為部分結(jié)構(gòu)化。程序被分成各部分放在若干功能塊中,每個(gè)功能塊含有用于一種設(shè)備的一系列控制邏輯。放置在組織塊OB1中的指令決定控制程序的各功能塊的執(zhí)行。比如說(shuō),一個(gè)分部程序可能包含以下內(nèi)容:
(1) 用于控制設(shè)備每一部分的FC;
(2) 用于控制設(shè)備每一工作狀態(tài)的FC;
(3) 用于控制操作員接口的FC;
(4) 用于進(jìn)行PLC自診斷的FC。
在分部程序中,既無(wú)數(shù)據(jù)交換也沒(méi)有重復(fù)利用的程序代碼。各功能塊收集并使用自己的數(shù)據(jù),功能塊不傳遞也不接收參數(shù),功能塊的編程與調(diào)用比較簡(jiǎn)單。由于每個(gè)功能區(qū)分為不同的塊,因而使得多個(gè)程序員能夠同時(shí)編程而不發(fā)生沖突。分部程序結(jié)構(gòu)的編程效率比線性程序有所提高,程序測(cè)試也較方便,對(duì)程序員的要求也不太高。對(duì)不太復(fù)雜的控制程序可考慮采用這種程序結(jié)構(gòu)。
3. 結(jié)構(gòu)化程序結(jié)構(gòu)
完全結(jié)構(gòu)化(模塊化)的程序結(jié)構(gòu)是PLC程序設(shè)計(jì)和編程有效的結(jié)構(gòu)形式,它可用于復(fù)雜程度高、程序規(guī)模大的控制應(yīng)用程序設(shè)計(jì)。結(jié)構(gòu)化程序可以重復(fù)使用某些功能塊,只需要在使用功能塊時(shí)為其提供不同的環(huán)境變量(實(shí)參),就能完成對(duì)不同設(shè)備的控制。例如,在工業(yè)攪拌控制過(guò)程中有三臺(tái)泵,對(duì)它們的控制功能相似,可以編寫(xiě)一個(gè)用于對(duì)泵進(jìn)行控制的功能塊,編程時(shí)先定義泵控制所需的變量(形參),并使用這些變量構(gòu)成一個(gè)稱為“泵控制”的一般功能塊。在調(diào)用該功能塊時(shí),通過(guò)改變傳入功能塊中的參數(shù)(實(shí)參),可以分別對(duì)成分A、成分B和攪拌桶中的三臺(tái)泵進(jìn)行控制。
結(jié)構(gòu)化程序有高的編程和程序調(diào)試效率,應(yīng)用程序代碼量也小。結(jié)構(gòu)化程序也支持多個(gè)程序員協(xié)同編程。這種程序結(jié)構(gòu)建立在對(duì)PLC系統(tǒng)功能的合理分析、分解及綜合的基礎(chǔ)之上,程序具體結(jié)構(gòu)形式的確定與程序設(shè)計(jì)人員的水平及經(jīng)驗(yàn)關(guān)系很大,對(duì)程序員的要求也較前兩種高。
1. 將過(guò)程分割為任務(wù)和區(qū)域
一個(gè)自動(dòng)化過(guò)程包括許多單個(gè)的任務(wù),通過(guò)識(shí)別一個(gè)過(guò)程內(nèi)的相關(guān)任務(wù)組,然后將這些組再分解為更小的任務(wù),即使復(fù)雜的過(guò)程也能夠被定義。下面將這個(gè)工業(yè)攪拌過(guò)程構(gòu)造為四個(gè)功能區(qū)域:配料A區(qū)域、配料B區(qū)域、混合罐區(qū)域和排料區(qū)域。
2. 說(shuō)明各個(gè)功能區(qū)域
1) 配料A和配料B區(qū)域
(1) 每種配料的管道都配備有一個(gè)入口和一個(gè)進(jìn)料閥以及進(jìn)料泵。
(2) 進(jìn)料管還有流量傳感器。
(3) 當(dāng)罐的液面?zhèn)鞲衅髦甘竟逎M時(shí),進(jìn)料泵的接通必須被鎖定。
Ametek 2 Stage Tangential Discharge Motor 7.2", 120V, 1400W
Returns: Accepted
AMETEK DIGISTROBE III HANDHELD STROBESCOPE MODEL 1965
AMETEK PANALARM ACS8-120A RELAY 8 PIN 120VAC 60HZ - NEW IN BOX
Ametek / USG Pressure Gauge w/ Diaphragm 0-100 psi
Ametek Pressure Transducer 100SV3000SM41B?3 3000PSIG New
AMETEK MODEL 116523-00
Ametek Motor 510438 1HP
AMETEK PHOTOTACH M#1893 DIGITAL ( B2)
AMETEK & ASHCROFT DEAD WEIGHT TESTER PUMP * SERVICE *
AMETEK L50-100 HYDROMETER
M998 SERIES HUMMWV H1 PRESTOLITE STARTER SOLENOID 24V SAT-4108UT M966 M1113 NEW
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Ametek Prestolite Power 500704-002 PM500 Battery Charge
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AMETEK DREXELBROOK 407-6000 SERIES LEVEL CONTROL
SCIENTIFIC COLUMBUS/AMETE?K 4044 TRANSDUCER ***NNB***
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New Ametek 316 SST Digital Compensated Pressure Transducer
Kenworth Speedometer W/Trip W900,T800,T600?,T300
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PANALARM AMETEK 8-PIN RELAY ACS8-120A NEW ACS8120A
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AMETEK IPS-200 INDICATING PRESSURE SWITCH -30 to 60 PSI
AMETEK LKG1 HUNTER SPRING MECHANICAL FORCE GAUGE IN CASE with INSTRUCTION MANUAL
AMETEK TAK-ETTE 1707 DIGITAL TACHOMETER TACH METER
RIS ISOLATED TRANSMITTER SC1302 SC-1302 NEW AMETEK
UE / Ametek Pressure Switch w/ Liquid Filled Viton Diaphragm H100-523 / LB
UE / Ametek Pressure Switch w/ Liquid Filled Viton Diaphragm H100-524 / LB
AMETEK T-750 Pneumatic PORTABLE Handheld Pump, 0 - 30" HG Vacuum
LOT 7 NOS AMETEK AEROSPACE / MIL-SPEC INDICATOR CABLES 2603W87P002 6680011979075
AMETEK MODEL 1893 PHOTOTACH
Drexelbrook Ametek Level Controller 408-8200 *NEW*
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AMETEK PRESSURE TRANSDUCER 12-28 VDC, NEW SURPLUS 1990
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AMETEK/HUNTER SPRING STATIC DISCHARGE & GROUNDING REEL + GROUNDING CABLE ~NEW~
NEW AMETEK DREXELBROOK 406-6100 SERIES LEVEL CONTROL
# Ametek Drexelbrook The Point PXLX Series Point Level Switch SERIAL# ABK-007248
Ametek Gemco Foot Switch 1025-B-1SP-U-X ____________S6?2
AMETEK MODCAL 2 MULTIFUNCTION CALIBRATOR
Ametek 1726 Digital Tachometer with Case
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NEW ACCURAY CORP. 072929-002 HEMI-PLUS SENSOR HI-TEMP SOURCE/DETECTO?R
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AccuRay Systems Thickness Gauge Scanner Radioactive Core Removed
AccuRay Scanner Overhead Track Thickness Gauge System Paper Processing
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ACCURAY 082157-002 USPP 082157002
ACCURAY 069829-002 NSPP 069829002
ACCURAY 069829-002 USPP 069829002
ACCURAY BMDC004A-006 LOGIC CONTROL MODULE BMDC004A006
ACCURAY 61595-003 NSFP 61595003
AccuRay 069829-001 FTI PC Board
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ACCURAY ABB 64844-004 PC BOARD PRI 64844004 064844-004
ACCURAY 082157-002 HRVI SCANNER CONTROL BOARD CIRCUIT BOARD MODULE CARD 51996
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ADEPT TECH 10330-11140 USPP 1033011140
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ADEPT TECH 90001-30320 NSFP 9000130320
ADEPT TECH 10400-07003 USPP 1040007003
Adept Tech 10133-11000 REV E Teach Pendant Controller
NEW Adept Tech Pendant P/N 101
30 Day Warranty
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ADEPT TECH VIDEO-BUS USPP VIDEOBUS
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Adept Tech 10300-11200 Rev. L JIB Control Board
Adept Tech 10300-11200 Rev. W Joint Interface Control Board
Adept Tech 10310-70200 Rev. D Master Control Board
Imaging Tech. IM-VME-ADEPT R-B1 L1 VME
Adept Tech VME 19000-00041 Flat Cable with LPT-10 Conn
Adept Tech 10203-30000 User Signal Adapter Belt Encoder
ADEPT TECH 90400-24035 USPP 9040024035
Adept Tech. 2 Robots #840 & 1 Controller Unit/Amplifier #310 w Remote, Used
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ADEPT TECH 10330-10150 PROCESSOR BOARD
OFFER & WIN ASSY 10330-00500 ADEPT TECH MODULE VJI
NEW IN BOX NIB ADEPT TECH CONTROL TEACH PENDANT 90400-02100-EX?TB01AD
ADEPT TECH 10330-12350 MODULE
ADEPT TECH 10330-11150 MODULE
ADEPT TECH/TECHNOLOG?Y 10338-53005 POWER AMP MOD C ***XLNT***
ADEPT TECH 10330-10200 MODULE
USED WORKING PULLOFF ADEPT TECH CONTROL TEACH PENDANT 90400-02100-EX?TB01AD
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