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IC693ACC303IC693ACC303

當(dāng)CPU處理前臺任務(wù)時，USB的傳輸可在后臺進行；后臺中斷服務(wù)程序和前臺主程序循環(huán)之間的數(shù)據(jù)交換可以通過事件標(biāo)志和數(shù)據(jù)緩沖區(qū)來實現(xiàn)。當(dāng)PDIUSBD12從USB收到一個數(shù)據(jù)包，即對CPU產(chǎn)生一個中斷請求，CPU立刻響應(yīng)中斷。在中斷服務(wù)程序中，固件將數(shù)據(jù)包從PDIUSBD12內(nèi)部緩沖區(qū)移到循環(huán)數(shù)據(jù)緩沖區(qū)，并將PDIUSBD12的內(nèi)部緩沖區(qū)清零，以便接收新的數(shù)據(jù)包，使CPU可以繼續(xù)執(zhí)行當(dāng)前的前臺任務(wù)直到完成。本文利用PDIUSBD12的端點1進行命令的傳輸和應(yīng)答，端點1每次接收計算機發(fā)送過來的8 B指令，其指令格式如表2所示。例如，接收到十六進制碼52 01 00 03 00 07 00 50，表示讀24C01器件從03字節(jié)開始的7個字節(jié)的數(shù)據(jù)。52H為R的ASCII碼，57H為W的ASCII碼。端點2用于數(shù)據(jù)的傳輸。

PLC的發(fā)展趨勢
    隨著PLC應(yīng)用領(lǐng)域日益擴大，PLC技術(shù)及其產(chǎn)品結(jié)構(gòu)都在不斷改進，功能日益強大，性價比越來越高。

    （1）、在產(chǎn)品規(guī)模方面，向兩極發(fā)展。一方面，大力發(fā)展速度更快、性價比更高的小型和超小型PLC。以適應(yīng)單機及小型自動控制的需要。另一方面，向高速度、大容量、技術(shù)完善的大型PLC方向發(fā)展。隨著復(fù)雜系統(tǒng)控制的要求越來越高和微處理器與計算機技術(shù)的不斷發(fā)展，人們對PLC的信息處理速度要求也越來越高，要求用戶存儲器容量也越來越大。
    （2）、向通信網(wǎng)絡(luò)化發(fā)展
    PLC網(wǎng)絡(luò)控制是當(dāng)前控制系統(tǒng)和PLC技術(shù)發(fā)展的潮流。PLC與PLC之間的聯(lián)網(wǎng)通信、PLC與上位計算機的聯(lián)網(wǎng)通信已得到廣泛應(yīng)用。目前，PLC制造商都在發(fā)展自己的通信模塊和通信軟件以加強PLC的聯(lián)網(wǎng)能力。各PLC制造商之間也在協(xié)商通用的通信標(biāo)準(zhǔn)，以構(gòu)成更大的網(wǎng)絡(luò)系統(tǒng)。PLC已成為集散控制系統(tǒng)（DCS）*的組成部分。
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鄭娟萍

廈門仲鑫航自動化設(shè)備有限公司  

 （3）、向模塊化、智能化發(fā)展
    為滿足工業(yè)自動化各種控制系統(tǒng)的需要，近年來，PLC廠家先后開發(fā)了不少新器件和模塊，如智能I/O模塊、溫度控制模塊和專門用于檢測PLC外部故障的智能模塊等，這些模塊的開發(fā)和應(yīng)用不僅增強了功能，擴展了PLC的應(yīng)用范圍，還提高了系統(tǒng)的可靠性。
    （4）、編程語言和編程工具的多樣化和標(biāo)準(zhǔn)化
    多種編程語言的并存、互補與發(fā)展是PLC軟件進步的一種趨勢。 PLC廠家在使硬件及編程工具換代頻繁、豐富多樣、功能提高的同時，日益向MAP(制造自動化協(xié)議)靠攏，使PLC的基本部件，包括輸入輸出模塊、通信協(xié)議、編程語言和編程工具等方面的技術(shù)規(guī)范化和標(biāo)準(zhǔn)化。

Baumer Electric Model:  IFR05.26.45 Proximity Sensor.  New Old Stock   

Anver Corporation Model: PS40-120V-PAR-102 Sensor.  0 - 100Kpa.  New Old Stock  

Compact Automation Products Model: RK6 Cylinder Repair Kit.  New Old Stock   

Turck Model: Ni5-G12-AP6X-V1131 Proximity Sensor  

Baumer Electric: IFMR 08P1703/S35L Inductive Prox. Sen 

Baumer Electric: IFMR 08P17A3/S35L Inductive Prox. Sen 

Baumer Electric Model: IFRM 08P17A3/S35L  Proximity Sensor.    

Baumer Electric Model: IFRM 05P3501/S35L  Proximity Sensor.    

Lot of Karl Lumberg:  RSC 4/9 Connector Kit. WAD-N.r:  3795345803. New Old Stk 

Turck Model: VB2-FSM 4.4/2FKM 404/S651 Cord Connector.  New Old Stock  

Honeywell / Micro Switch Model: FE-TLS3 Sensor  

Novotechnik Model: FTI 10.4.67.0.k1 Non-Contacting Precision Sensor. Sm. Tip   W

Lot of HAMLIN: 59145-010 9927 SENSORS.  QTY (3).  New Old Stock   

Turck Model: Bi1.5-H6.5-AP6X-V1131 Proximity Sensor with Cable      

Optek Technology Model:  OPB982T51 Sensor.  New Old Stock.  No Box  

SMC Pneumatics Model: D-H7PW Band Mount 3-Wire PNP Switch  

Allen Bradley 42KB-S2LPSA-A2 Photoelectric Sensor.  Series A  

SMC Pneumatics Model: D-H7A2 Band Mount Sensor  

Baumer Electric: IFRS 12P1002  Proximity Sensor  

Omron Model: TL-X2MC1-GE Proximity Switch  

Honeywell / Micro Switch  WZE-RQK6  Switch.   NIB

Honeywell / Micro Switch 201LS503 Limit Switch, NIB

Honeywell Micro Switch Model: 926AB2W-A9T.  New Old Stock.  No Box    

Honeywell /Micro Switch / Yamatake FE3-DD6-P Fiber Amp 

Turck Model: PKW 3Z-0.3-PSG 3/S90 Cord.  ID Number: U0075.  New Old Stock   

Baumer Electric My-Com Model: G75P/300/L Precision Switch.  New Old Stock   

Turck Model: BS8141-0 Circular Connector.  Ident. No: 69010.  New Old Stock   

Turck: Bi1-EG05-AP6X Proximity Sensor, Ident. # 4609740.  New Old Stock  

Turck Model: Bi1-M12-AP6X-H1141 Proximity Sensor   

Lot of pHd Pneumatics: ML188220 Transition Plates, 3 

Lot of pHd Pneumatics: 12243 Hardware Kit, Qty. 3.  New Old Stock   

InterlinkBT: PKGE4M/3M PicoFast Cable.  IPSKP4-3/S90 

InterlinkBT: PKGE4M8/RK4.4T PicoFast Cbl. RK4.4T-8-IPS 

GUARDSCAN PSSU/2 24V 6VA CONTROL UNIT QTY (2)  

MICRO SWITCH LS10 HONEYWELL MICRO SWITCH LS10 NEW  

Honeywell / Microswitch Model: 922AA1E-B4N-L Proximity Sensor.  New Old Stock  

Honeywell / Microswitch Model: 922FS1-A4P-6.5 Proximity Sensor.  New Old Stock  

BERNSTEIN SENSO-PLUS M18PA/008-2 Sensor, new =

HONEYWELL HPF-T010-H 0044 SENSOR.  New Old Stock    R

Honeywell / Microswitch: 922FC06YA-A3P-L-Z295 Proximity Sensor.  New Old Stock 

pHd, Inc Model: 17524 Proximity Switch Hall Effect PNP.  Gently Used Stock   

Turck Model: MK1-22UP-Ex0/24VDC Multi Modul Switching Amplifier. Good Used.    W

Honeywell / Microswitch: 922FS0.8-4AP-G-Z925 Proximity Sensor.  New Old Stock 

Turck  Part Number: PKG 3Z-6/S90 Euro Fast Cord.  ID: U0067. New Old Stock  

Turck Model: Ni8U-EM12-AN6X. 7m Sensor, Ident-No: 1644323.  New Old Stock   

Turck Model: MK13-UPF-Ex0  Multi Modul Switching Amplifier. Good Used.   

Turck Model: MK13-UR-Ex0/24VDC  Multi Modul Switching Amplifier. Good Used.   

Turck Model: MK72-S01-Ex/24VDC  Multi Modul Switching Amplifier. Good Used.   

Turck Model: MK1-22UN-Ex0/24VDC  Multi Modul Switching Amplifier. Good Used.   

Weber WN 101892 N Proximity Sensor.  New Old Stock.  No Box  

Turck Model: Bi1-EG05-AP6X-V1331 Proximity Sensor, with U0073 Cord / Cable.   

Hamlin Model: 59135-010 Magnetic Sensor.  New Old Stock.  

Turck Model:  Ni2-M12-AP6X-H1141 Proximity Sensor  with U2159 Cord / Cable   

ipf Model: MZ R9 01 74 Infrared Sensor.  10-36V DC, 300mA.  New Old Stock.   

Turck Model:  Bi2-M12-AD4X-H1141 Proximity Sensor.    

Turck Model: 16025 Sensor with Cable   

Turck / PicoFast: U2134-25.  P/N: PKG 3Z-0.3-PSG 3/S90 

Turck Model: Bi2-M12-AP6X-H1141 Proximity Sensor.  Unused Old Stock   

Turck / Pico Fast: T-338797-HP-TBP Multibox Junction  

Baumer Electric: FED 14.24.45/L/K858 Proximity Sensor.  New Old Stock  

Turck ID Number: U2173.  Part Number: RK 4.4T-4 Cord  

Lemo  Model: FGG.1B.  Red Dot.  Seven Pin Circular Connector.  New Old Stock   

Compact Comtronic Series Model:  WSCL-3  Limit Sensor.  PNP.  New Old Stock   

Turck: Bi1-G08K-AP6X-H1341 Proximity Sensor, Ident. # 46720  

Turck Model: Ni8-S18-AP6X-H1141 Inductive Sensor 

Turck P/N:  Bi5-G18-AP6X-B1341 Proximity Sensor.     

Honeywell / Micro Switch LSP1 Limit Switch, w/ Lever  

Honeywell / Micro Switch LSP1 Limit Switch, w/o Lever  

Honeywell / Micro Switch 923AA2XM-A7T-L Proximity Swt 

Turck Model:  Ni3-EG08K-AP6X  Proximity Sensor    

Honeywell / Micro Switch  Model: FE7B-DD5-M957A Sensor.  New Old Stock    

Turck Model: Bi4-M12-AP6X-H1141 Proximity Sensor  w/ U2211 Cable   

Turck: Bi1-G08-AP6X Proximity Sensors, 7.00M 

Compact Air Products  Model:  WSCLP Limit Sensor.   New Old Stock   

CompactAir Products Model: AWHE Sensor.  New Old Stock   

Lumberg Model:  RK 50-677/6FT Mini Connector Cable.  New Old Stock   

Sensopart Model: FMS 12-165 / PN: 517-51418 Sensor  

Lot of Turck: Bi2U-M12-AP4X-H1141 Proximity Switches.  Qty. 2.  New Old Stock   

Lot of Veeder-Root: 656540-010 NPN Current Sinking.  New Old Stock  

Lot of Hamlin Model: 59135-020 Sensors.  Qty. 3.  New Old Stock.  No Box   

Honeywell / Micro Switch BAF1-2RN18-RH Limit Switch.  New Old Stock  

HONEYWELL MICRO SWITCH FEF-PLT1-L2 FEA0923 CABLE NEW  

Honeywell / Microswitch: 922AB2XM-A9P-L-Z925  Switch.  New Old Stock  

Turck: Bi2-M12T-AP6X Proximity Switche, Nr. 4606000  

Turck Part Number: RK 4.4T-2 / U2172 EuroFast Cable 

pHd / Brad Harrison  Proximity Sensor, PN's  Below 

pHd, Inc Cordset Pin Assignmnent, Model: 17533-00-02.  New Old Stock   

Turck Model: Bi3NF-EM12HE-AP6X2-1141 Proximity Sensor.  New Old Stock.     

Turck Model: BC10-S30-Y1X Capacitive Sensor.  Gently Used.      

Baumer Electric Model: FSE 200C4002 Plastic Fiber Optic Cable.  New Old Stock  

Pepperl+Fuchs Model: NJ 2-F1-E2  Inductive Sensor.  New Old Stock. .   

Turck Model: VB2-FSM 4.41/2FKM 4.21 Cord Connector.  Unused.  Old Stock No Box 

Baumer Electric: IFRM 06P1501/S35L  Proximity Sensor.  New Old Stock  

Lot of Mixed Honeywell / Micro Switch Proximities.    

Turck Model: BS 5133-0 Circular Connector.  Ident. No: 6901012.  New Old Stock 

Rotron EG&G Model: 2A Air Flow Swich.    

Turck Model: 4623502 Cylinder Proximity Sensor * W2

EPARTS 207-001 AIR PROXIMITY SENSOR 7290-0025 NEW 

IFM Electronics Model: OK5008/OKF-FPKG Fiber Amplifier 

Pulnix TM-7EX Monochrome Video Camera  w/ AC Adapter  

Sony Model: XC-75CE CCD Camera Mounted to Philips Base 

Pulnix TM-7EX Monochrome Video Camera  

Austria AGRU: PN 10.   PVDF-HP-Elbow  45° elong  Elbow.  90 X 2.8 3".  New Old  

Austria Model: PVDF-HP Union with Viton Sealing.  PN16.  New Old Stock   

Agru Fittings:  25x2,7 SDR11 FPM-0-Rg. PPR-Union butt/type 2.  New Old Stock  

Austria Model: PVDF 45° elong High Purity Elbow.  New Old Stock   R

Austria Model: PVDF 45° elong High Purity Elbow.  63mm O.D.   New Old Stock   R

Georg Fischer + GF+ PVDF-HP Reducing Bushing  R

Georg Fischer + GF+ PVDF-HP 45° High Purity Elbow  R

Georg Fischer + GF+ PVDF-HP 45° High Purity Elbow  R

Austria Model: PVDF 90° elong High Purity Bend.  110mm O.D.  New Old Stock   R

Georg Fischer + GF+ PVDF-HP 90° High Purity Bend  R

Parker / emecanique Model: PS1E28102B Micro Valve.  New Old Stock  

Lot of Parker 4 FNV-SSR 316L SS Vacuseal High Purity  

Lot of 8500W / 400V Quartz Infrared Lamps, New.    R

Lot of 8500W / 400V Quartz Infrared Lamps, New.    R

Lot of 6000W / 300V Quartz Infrared Lamps, New.    R

Lot of 10000W / 480V Quartz Infrared Lamps, New.    R

Lot of 10000W / 480V Quartz Infrared Lamps, New.    R

Lot of 10000W / 480V Quartz Infrared Lamps, New.    R

Lot of 8500W / 400V Quartz Infrared Lamps, New.    R