DR45AT-1100-00-000-0-000P00-01通訊板
DR45AT-1100-00-000-0-000P00-01通訊板
DR45AT-1100-00-000-0-000P00-01通訊板
PLC編程語言與一般計算機語言相比,具有明顯的特點,它既不同於語言,也不同與一般的匯編語言,它既要滿足易於編寫,又要滿足易於調試的要求。目前,還沒有一種對各廠家產品都能兼容的編程語言。如三菱公司的產品有它自己的編程語言公司的產品也有它自己的語言。但不管什麼型號的其編程語言都具有以下特點圖形式指令結構:程序由圖形方式表達,指令由不同的圖形符號組成,易於理解和記憶。係統的軟件開發者已把工業控制中所需的獨立運算功能編制成象徵性圖形,用戶根據自己的需要把這些圖形進行組合,並填入適當的參數。在邏輯運算部分,幾乎所有的廠家都採用類似於繼電器控制電路的梯形圖,很容易接受。如西門子公司還採用控制係統流程圖來表示,它沿用二進制邏輯元件圖形符號來表達控制關係,很直觀易懂。較復雜的算術運算、定時計數等,一般也參照梯形圖或邏輯元件圖給予表示,雖然象徵性不如邏輯運算部分,也受用戶歡迎,明確的變量常數:圖形符相當於操作碼,規定了運算功能,操作數由用戶填人,如等中的變量和常數以及其取值範圍有
簡化的PLC程序結構:的程序結構通常很簡單,典型的為塊式結構,不同塊完成不同的功能,使程序的調試者對整個程序的控制功能和控制順序有清晰的概念
4.簡化應用軟件生成過程:使用匯編語言和語言編寫程序,要完成編輯、編譯和連接三個過程,而使用編程語言,只需要編輯一個過程,其餘由係統軟件自動完成,整個編輯過程都在人機對話下進行的,不要求用戶有高深的軟件設計能力。強化調試手段:無論是匯編程序,還是語言程序調試,都是令編輯人員頭疼的事,而的程序調試提供了完備的條件,使用編程器,利用和編程器上的按鍵、顯示和內部編輯、調試、監控等,並在軟件支持下,診斷和調試操作都很簡單。
總之的PLC編程語言是面向用戶的,對使用者不要求具備高深的知識、不需要長時間的專門訓練。
一、前言
當前,可編程控制器(PLC)作為一種成熟穩定的控制器,以的穩定性、可靠性、抗幹擾性和編程簡單、容易掌握等特點在工業控制領域得到了越來越廣泛的應用。在控制係統中,PLC作為主控設備,與控制對象中的各種輸入信號(如:按鈕、接近開關、編碼器等檢測信號)和輸出設備(如繼電器線圈、電磁換向閥等執行元件)相關聯,隨著控制係統的復雜程度和控制設備增多,PLC需要的輸入輸出點數也大量增加,這就有必要通過採用各種方法對I/O點進行優化,來減少係統佔用I/O點數使用數量,提高I/O的利用率,降低硬件使用成本,下面以西門子PLC為例從軟件和硬件兩個方面進行探討。
二、軟件方法
1. 單按鈕控制啟動/停止
通常情況下,PLC控制的外部設備至少要有一個啟動和一個停止按鈕作為輸入信號來控制程序的運行和停止,因此至少需要兩個輸入點,在點數緊張的情況下可採用單按鈕控制進行優化,將節省下的點留作擴展功能。
圖1為PLC的外部接線,SBl接輸入I0.0,Q0.0接繼電器輸出,通常情況下,繼電器應反向並聯一個二極管。
圖2中,輸入信號I0.0第一次短暫閉合,在正向脈衝指令下,輔助繼電器M0.0輸出一個周期的脈衝,則使網絡3接通,輸出Q0.0並實現自鎖,輸入信號I0.1第二次閉合,則網絡2接通,使輔助繼電器M0.1接通,常閉點M0.1打開,使網絡3斷開,輸出Q0.0停止輸出。
除了上述的方法外還可以採用計數器,R/S指令,寄存器等方法實現。圖3為採用R/S指令方式的方法
2. 典型問題和解決方法
在實際運用的過程中,如果對PLC的運行原理不了解或理解的不夠透徹,那麼在程序的編寫上很容易出現問題,左圖也為單按鈕實現啟動/停止的梯形圖,但在實際的調試中確是不可行的,達不到為我們預期的效果,通過與圖2的對比我們發現:在網絡1上少一個正向脈衝指令,這個指令是關鍵。這樣我們就清楚問題的所在:由於I0.0.接通的時間比一個掃描周期的時間長,有時為N個或N+1個,要達到我們的目的每次都是奇數才可以,所以導致調試時的不成功,因此加一個正向脈衝指令可解決這個問題。同樣如果將圖2中網絡2和網絡3顛倒,其結果是Q0.0沒有輸出,原因是:在一個掃描周期內,網絡2和網絡3先後接通,然後將運算結果存人映像寄存器當中,所以就不會有任何的輸出
在R/S方法中,容易出現的問題是鎖存器的R/S端不能採用圖5這種結構,係統會提示錯誤,所以只能是圖2中的結構,才能正確執行
上述是用單觸點實現啟動/停止方法中比較常見的典型問題,尤其是初學者容易出現,這些問題雖然不大,但往往都是關鍵,如果在設計和調試中考慮到這些因素的存在,那會減少錯誤和縮短調試的周期。
三、硬件方法
1. 優化輸入點數
在某些應用場合下有“自動控制/手動控制”的要求,並且在運行過程中,自動和手動不會同時進行,這樣就可以將自動和手動按照不同的控制狀態分組接入PLC輸入端,可減少輸入點,提高輸入點的利用率,圖6中的示例節省了50%的I點,相當於輸入點數擴充了一倍
其中SA為手動/自動切換開關,SBl,SB2,SB3為一組輸入,SBl0,SB20,SB30為一組輸入。
在某些聯鎖情況下,如果PLC內部不採集該觸點信號的狀態,可採用物理聯鎖的方式進行,即硬件連接上進行聯鎖(不必每一個開關量都接到PLC的輸入端),也可在程度上減少輸入點數。
2. 優化輸出點數
除了優化輸入點數外還可優化輸出點數,對係統整個運行過程中,輸出狀態完全一樣的執行元件可以採用並聯的方式,但要注意負載的功率情況,通常情況下採用繼電器加續流二極管。此外還可以採用三八線譯碼器等方法,但需採用外部元器件,操作略微復雜一些。
四、結論
上述的幾種方法雖然比較簡單,但切實可行並且容易掌握,在不同的PLC中實現的途徑略微不同,但基本思路都是一致的,通過對係統的優化可以進一步提高I/O的利用率,節省輸入和輸出點的數量,減少PLC的體積,降低硬件成本,具有很高的實用價值。
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llen-Bradley Model: 100-A30NZ*3 Starter, Series B
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TORQUE GEAR REDUCER TYP Z 20 Md MAX 2500 NCM i 190 NEW
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WESTINGHOUSE Series C HMCP 3 Amps 3 Pole 600VAC =
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Altech Corp. 1GU05 Manual Motor Controller, G 0.5A
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Square D Class 2510, Type: MCG3 Manual Starter. 3 Phase, 200/230, 380/460 V AC
Eaton / Cutler-Hammer Model: 10250T Contact Block
Eaton / Cutler-Hammer: 8530A-6501 Output Device Relay
BOSCH SCHWENKANSCHLAG 3842184750 NEW
Allen Bradley 800T-D Momentary Switch. Series T.
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ALLEN BRADLEY 1492-SP3C040 SER C 4 AMP CIRCUIT BREAKER
Motion Control Products Centent, Model: CN0165. Genltly Used
ALLEN BRADLEY 1492-SP2C040 SER C 4 AMP CIRCUIT BREAKER
Danfoss Type: CH-16 Contactor with Danfoss Type: TI-16C Overload Relay
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Allen-Bradley Cat. # 1492-CB2-G050 Breaker. 5A, 1?HP. Series B.
ORIENTAL MOTOR 3RK15GN-A REVERSIBLE MOTOR 15WATT 100V 0.42/0.45A
Siemens Model: 6ES7901-0AE00-0XA0 5M USB Cable. New Old Stock
Heinemann AM3-A3-A 3 Pole Breaker, AM3--A3-0015-02E
Lot of Togi ATK-20 Direct Mounting Terminal Blocks. 2
Hitachi Earth-Leakage Circuit Breaker, Model: EX50B
Fuji Electric Model: EG53A Circuit Breaker. 40A.
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Allen-Bradley Cat. # 1492-SP3C400 Circuit Breaker. 3 Poles, 40A. Series C.
Allen-Bradley Cat. # 1492-SP3C020 Circuit Breaker. 3 Poles, 2A. Series C.
Allen-Bradley Cat. # 1492-SP3C060 Circuit Breaker. 3 Poles, 6A. Series C.
Allen-Bradley Cat. # 1492-SP2C040 Circuit Breaker. 2 Pole, 4A. Series C.
Fuji Electric Model: EG33A Circuit Breaker. 20A.
Fuji Electric Model: SRCa361-0/X Contactor.
Fuji Electric Model: 26 Magnetic Contactor. P/N: SC-1N/S.
Fuji Electric Model: CP32D Breaker. 30A
Fuji Electric Model: 13 Magnetic Contactor. P/N: SC-0/C.
Electroid Model: BEC-42C-0-8-90V-H Clutch. New Old Stock
Allen-Bradley Cat. #: 193-EB1DB Overload Relay. Series B
Allen-Bradley Cat. # 1492-FB3C30-L Fuse Holder. Series A.
Danfoss Model: 176G7310 Remote Kit, 2 Meter
Square D Catalog Number: SDSA3650 Secondary Surge Arrestor. 650VAC Max.
Allen-Bradley Cat. # 1492-FB2C30 Fuse Holder. Series A.
Siemens Model: 5SX25 (C10) Circuit Breaker with 5SX9100HS Auxiliary Contact
ABB Model: 1SNA021053R1000 BF0M-16-TF Interface Module
Fuji Electric Model: 65 Magnetic Contactor. P/N: SC-3N/S.
Fuji Electric Model: 19 Magnetic Contactor. P/N: SC-4-1/C
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Moeller Model: FAZN-B16-2 Starter / Contactor
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Allen Bradley Cat. #: 592-B0V169 Overload Relay. Series B =
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Sprecher + Schuh Model: KTA3-25 Motor Protector.
Cutler Hammer: C306DN3 Circuit Breaker With H2001 Overload Heater Elemet
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Siemens Model: 5SY6202-8 / 5SY62MCB-D2 Breaker. 400V, 2 Pole.
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Oriental Motor Model: SS31MA-J Control without Base
Allen Bradley Model: 700DC-MB400* Contactor, Series A
ALLEN BRADLEY 800T-N51 CLUSTER PILOT LIGHT LENS NEW
Siemens Model: 3TH2040-0BA4 Contactor
Traco Engineering TB5-5 Speed Controller in Hoffman w/
Sprecher + Schuh Model: KTA3-25 Motor Protector. New Old Stock
Siemens BERO Inductive Sensor, Model: 3RG1613-0AB00. 65 V DC pnp. 0.2A
Allen-Bradley: 700-F400A1, Series B Control Relay
Cutler-Hammer: HFD3040L Series C Circuit Breaker. 40A; 3 Pole. New Old Stock
Cutler-Hammer: H2023-3 Freedom Series Heater Pack. Set of 3. New Old Stock
Cutler-Hammer: H2004B-3 Freedom Series Heater Pack. Set of 3. New Old Stock
Cutler-Hammer: H2011B-3 Freedom Series Heater Pack. Set of 3. New Old Stock
Cutler-Hammer: H2015B-3 Freedom Series Heater Pack. Set of 3. New Old Stock
Cutler-Hammer: H2022-3 Freedom Series Heater Pack. Set of 3. New Old Stock
Cutler-Hammer: H2008B-3 Freedom Series Heater Pack. Set of 3. New Old Stock
Lot of Cutler-Hammer Model: E22B1 Contact Blocks, 2
Siemens Model: 3TF44 Contactor w/: 3TY7561-1B & 3TY7561-1A Aux. W2
Siemens Model: 3UA59 00-1G Contactor. 4-6, 3A W2
Allen Bradley Cat #: 700DC-MB220* Contactor. Series A
ABB Model: 017926920 Communication Cable. 1SNA179269R2000. New Old Stock
Allen Bradley Cat #: 195-MA04 Auxiliary Contact Adder Deck. Series A W2
Lot of Allen Bradley Cat #: 199-MSMD1 Surge Supressor. Qty. 2. Series A
SIEMENS 3TH2022-OBB4 RELAY =
Cutler-Hammer: H2002B-3 Freedom Series Heater Pack. Set of 3. New Old Stock
Oriental Motor: SS21-UL Control Pack w/o Base
Siemens Model: 3VU1300-1ML00 Circuit Breaker
Mars Model: 35006 Motor Overload. New Old Stock.
Merlin Gerin Model: DPNa vigi. Multi9 C16 Circuit Breaker.
Klockner Moeller Model: DIL EM-10-G Contactor
Allen-Bradley: 193-BSB 16 Overload Relay, Series B
Allen Bradley Model: 100-A09ND3 Contactor. Series B
Cutler-Hammer Model: E22E2 Red Extd PB. New Old Stock
Sprecher + Schuh Model: CT3-32 Thermal Overload Relay O
ITT Neo-Dyn: 200P183C Adjustable Press. Switch. Incr. Range:1K - 10K PSIG
Allen Bradley Model: 500-BOD93 Contactor
Square D Model: 8501 Industrial Control Relay
Square D Model: FA36100 Molded Case Circuit Breaker
ALLEN BRADLEY 700-CP1 SERIES A. New Old Stock
Allen-Bradley: 500-AOD950 w/ 595-A Auxiliary Contact
Tazmo Model: E0R05-17895B Pulse Control Board
ABB Model: CBK-EP1 Enclosure with ABB CE4T-10R-02 Emergency Stop Pushbotton
Square D Cat. No.: FA62407010 Circuit Breaker
Reliance Electric IMPakPlus VS Drive
Allen-Bradley Cat. #: 193-A4D1 Overload Relay. Series A
Allen-Bradley Cat. #: 193-EA1EB Overload Relay. Series B
Danfoss Type: T1 16C Overload Relay.
ALLEN BRADLEY 1492-CB1H070 B CIRCUIT BREAKER 7AMP NEW
Danfoss Type: CI-16 Contactor with Danfoss Type: CB-NO Aux. Contactor
Danfoss Type: CI-9 Contactor
Danfoss Type: C-10 Contactor with Danfoss Type T16C Overload Relay
Slo-Syn / Fico Trim & Form Systems Motor Control Cable
Sprecher + Schuh Model: CS4-P Auxilary Contact. New Old Stock. No Box
Moeller Model: DIL00A M AC Contactor / Starter
Benedikt & Jager Model: K16 A21s Circuit Breaker
Oriental Motor Model: 2RK6GN-AWM AC Magnetic Brake Motor O
Oriental Motor: 2RK6GK-AM w/ Oriental Motor: 2GK30K Gearhead Servo Motor O
Lot of Siemens Model: 5SX21 Mini. Circuit Breakers. K
Lof of Siemens Starters and Thermal Overload Relay K
Parvalux Gear Motor. Ref: SD 1C SiS / 618561 / 7D
Allen Bradley Cat #: 700DC-M400* Miniature Relay. Series A
Varitap Model: VP-05C Potentiometer with Light Star 605A-S Guage