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當CPU處理前臺任務時，USB的傳輸可在后臺進行；后臺中斷服務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志和數(shù)據(jù)緩沖區(qū)來實現(xiàn)。當PDIUSBD12從USB收到一個數(shù)據(jù)包，即對CPU產生一個中斷請求，CPU立刻響應中斷。在中斷服務程序中，固件將數(shù)據(jù)包從PDIUSBD12內部緩沖區(qū)移到循環(huán)數(shù)據(jù)緩沖區(qū)，并將PDIUSBD12的內部緩沖區(qū)清零，以便接收新的數(shù)據(jù)包，使CPU可以繼續(xù)執(zhí)行當前的前臺任務直到完成。本文利用PDIUSBD12的端點1進行命令的傳輸和應答，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應用領域日益擴大，PLC技術及其產品結構都在不斷改進，功能日益強大，性價比越來越高。

    （1）、在產品規(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、技術完善的大型PLC方向發(fā)展。隨著復雜系統(tǒng)控制的要求越來越高和微處理器與計算機技術的不斷發(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)絡化發(fā)展
    PLC網(wǎng)絡控制是當前控制系統(tǒng)和PLC技術發(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)商通用的通信標準，以構成更大的網(wǎng)絡系統(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)和應用不僅增強了功能，擴展了PLC的應用范圍，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準化
    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規(guī)范化和標準化。

SMC Pneumatics Model: 1SE40-C4-62L Pressure Switch.  Max. Presssure  

SMC: Model: NVF3130-5T-02T Pilot Solenoid Valve.  New Old Stock. No Box    

SMC Model: NZM121H  Vacuum Ejector Assembly   

Mace Model: 850-1144 Solenoid Teflon Valve.  New Old Stock  

Numatics Actuator: S4CK-02A21B / KB-190811-4 Cylinder. ?:  1.5.  ST: 2.    

CKD Corporation Model: AVB21-X0017 Aiir Operated Valve for High Vacuum     O

CKD Corporation Model: AVB21-X0022 Aiir Operated Valve for High Vacuum     O

Fabco-Air Mini-Pancake: B-7-X Cylinder, 1/8" Bore  

Numatics Model: P71N-02 Stainless Steel Filter / Regulator with Gauge  .  

Parker Model:  D3W1CNYC 14 Directional Control  Valve    

Hyvair Model: D03SD-2F-115A-35 Pilot Air Valve     

Parker Model:  D3W8ENYC 14 Directional Control  Valve    

Parker Model: PRM3PP25K Pressure Control Valve with Liquid Filled  Gauge    

Parker Model: FM3DD Pressure Control Valve.  3000 PSI     

Dormeyer Model: C9-2000-1 Solenoid.  New Old Stock    

Kuroda XC Cylinder, Mocel: XG2-2020 w/ Sensors & SPU-04-M5 Pneumatic Fittings   

Festo Model: GRLA-1/8-QS-4-RS-D  One Way Flow Control Valve.  New Old Stock  

Numatics Model: 555JJ43AO000000 SOLENOID VALVE/BASE *W

SMC: NVJ3140Y Valve with 2DT-98-009C-E Cable   

Held AG  Model:  DA-25 Rotary Drive Assembly.  0 - 180°, 2 Position, 2.5 Nm Tor 

Robohand Model: SM-200 Pneumatic Air Parallel Gripper  

Vickers Model: QF-3-C-10D1 Double A Hydrulic Valve    

Kuroda Model:  C-2-50-60-R Cylinder.  NO. CA   

Humphrey Model: N8119 Air Pilot Valve, TAC  

Lot of Clippard:  11761-3 Fiber Buna Gaskets. Black   Qty.20.   New Old Stock 

Lot of Clippard:  11761-4 Nylon Gaskets.  White   Qty.20.   New Old Stock 

CKD Model: US-M5-37 General Purpose Solenoid Valve  

MTS Temposonics R·Series Position Sensor,  Model:  RHT1001UD601A01  

MTS Temposonics L·Series Position Sensor,  Model:  LHTRB00U00101A01   

Robohand Model: DLK-10-E-C-2-D Thruster  Cylinder. with Sensors.    

Bosch Rexroth Model: VE2/H Stop Gate, P/N: 3.842.524.896.  With Turk Sensor  W2

MTS Temposonics L·Series Position Sensor,  Model:  LHTRB00U00101A0.  1" Stroke  

Rexroth Bosch Model:  3842526263 / 3 842 526 283 Drive Casing.  New Old Stk   W2

MTS Temposonics L·Series Position Sensor,  Mdl:  LHTRB00U00101A0.  0010" Stroke 

Lot of Swagelok / Cajon: SS-8-VCR-3-6TA Tube Adapter 

MTS Temposonics L·Series Position Sensor,  Mdl:  LHSRB00U0010A0.  1.0" Stroke 

SMC Model: NVZ3540-5LOZ Solenoid / Pilot Valve, 24VDC  

Numatics Actuator Model: F70C-13A1B-AAA2 Cylinder  

Lot of HSV96E Pneumatic Cylinder Valves, Unknown Mfg.  

NUMATICS NAF252004N000F 24-145 psig Valve, =

SMC Pneumatics CY1B10H-500 Rodless Basic Cylinder  

ASCO Valve, new  !!! =

ANDOVER U5B Low Pressure Regulator U5B LP / 5M3, new =

ANDOVER U5 Pressure Regulator 5M2, new =

Bimba EF1,  Model: EFD-2515-3E Pnenumatic Cylinder.  New Old Stock   

SPX / Deltech Triad T125E Breathing Air Filter.  New Old Stock    

Desoutter Model: AFD205-2700 Drill / Tapper Pneumatic Drive / Feed   

UCV 10K - 1/4 Micro-Flow Control Valve, CTFE-SEAT   R

Kuhnke Model: D74-ROR-F-DS7523 Rotary Solenoid.  24V DC, *ED.       

Clippard Model: ET-3M-24VDC Air Valve.    

Lot of SMC Model: KQH11-00 Fittings.  Qty. 3.   New Old Stock    

Fabco-Air P/N:  PS-212 Pneumatic Cylinder   

Bimba EF1,  Model: EFT-3220-3M Cylinder.  New Old Stock   

Numatics: 018SA400M000061 Solenoid Valve Assembly w/ 225-285.  New Old Stock  W2

Parker Directional Valve w/ (2) F71XVBG023A, (2) PS378166P Mouted to Manifold  

SMC Model: NVZ5220 Dual Port Solenoid Valve   W

PNEUTRONICS PN 990-4280-001 CONTROL BOARD PCB NEW  

SMC Model: CDBM2L25-25-RL-C73 Cylinder.  New Old Stock    

Vickers Model: 258249 #1 Keyed Pump Shaft.  New Old Stock   

Industrial Devices Position Indicating Magnet Cylinder w/ S3T Motor & RPS-1    

Industrial Devices: D205A-22-MF1/MS1FT1 Electric Cylinder.  Unused Old Stock   

Numatics Actuator Model: SH10602LB16DS4 Linear Slide.  2" Stroke, 1 1/16" Bore W

SMC Model: NCDJPB10-025D Cylinder.  New Old Stock  

CKD Model: SCPD2-1645 Pneumatic Cylinder.  New Old Stock 

SMC: Model: CXSM25-40 Cylinder.  The Two D-Y59B Switches have Short Cut Wire   W

SMC: Model: CXSM25-40 Cylinder.     W

SMC: Model: MXQ25-150B Slide Table      W

Worchester Series 39 Numatic Actuator.  39N.  80 PSI, 270 IN. LBS, 120 PSI Out  

Turn-Act, MN: TA-B4040 Pneumatic Actuator  

Humphrey Model CS3HA-HP Sensor  

Humphrey Model: 310 Solenoid.  24v DC, 4.5 Watts, 0 - 125 PSI    

Humphrey Model: 320 Solenoid.  24V  DC, 8.0 Watts, VAC-125 PSI    

FABCO-AIR Cylinder H-121-XDR-E-F w/ SMC NJ05 Joint =

BuTech Double-Acting Aluminum Housing Pneumatic Actuator, 3K123 w/ ADA180   W

 Humphrey Model:  CP3054  Pneumatic Cylinder.    

SMC: Model: NVFS4200-5FZ Pilot Solenoid Valve with Manifold and Filters    

Festo Model:  DPZJ-10-25-P-A-S2 Cylinder. PN: 159941.  New Old Stock,  No Box H 

Festo: DSL-16-25-270-P-520-FF. Swivel PN: 159545.  New Old Stock,  No Box    H 

Airmachines.com Model: DD5A06C Pneumatic Self Feed Drill.  600 RPM, 10mm Chuck W

Desoutter Model: AFD205-2700-A6-L32 Drill / Tapper Pneumatic Drive / Feed   

Bimba FLAT-1, Model: FOD-311  .75-4R Cylinder.  New Old Stock   

Humphrey Model: M3E1 Mini-Mizer Valve.  24VDC, .5W, 0 - 100 PSIG  

Allenair Kit Part Number: E-4.0-HTP-P.  New Old Stock  

Festo Model:  LFMP-?-S-C  Filter Element.  Part Number: 159173.  New Old Stock  

CLIPPARD MINIMATIC CS 292 644-6795-003 CYLINDER QTY 2  

Herion (Norgren) Model: 8222400.8024 Valve.  120V, 60Hz, 23VA, 1900 bar   W

Numatics: 237-804B Solenoid Valve.  110-115/15; 110-120/60; 06A.  New Old Stock 

ARO WELDING / SAVAIR STEEL PNEUMATIC CYLINDER J-G3-1680-24N  

CLIPPARD MINIMATIC 3CS1 CYLINDER QTY (3) NEW  

SMC Cylinder Model: RSDQB50-20D-XC18 Cylinder  

R & I MFG. Model: GH-20A Dura-Grip Valve  

American Cylinder: 562DVS-1.00-4 Cylinder.  9/16" Bore, 1" Stroke.  New Old Stk 

Vickers Model: 880024 PBDG4SL 016C B 60 Pilot Valve

SMC Model: MXS20-50 Pnuematic Dual Rod Cylinder Slide w/ (2) D-M9N Sensors  

Predyne (Precision Dynamics): B3313-31 Solenoid Valve  

SMC Pneumatics Model: ARP3000 Precision Air Regulator  

Clippard / Minimatic Model: R-301,  3-Way Valve.  New Old Stock 

SMC Pneumatics Model: ZSE4-01-26 Pressure Switch.  Max. Presssure: 101kPa 

SMC Pneumatics Model: CDJ2L16-15S-C732 Cylinder w/ SMC: D-C73 Reed Switch  

Roessel & Co. Model: 41396501 Air Cylinder.  ?" Bore, 1? Stroke New Old Stock.  

Bank of  Numatics 031SA4154011Z (8) & 236-279 (9)   

Festo Model: GRL-10UNF One Way Flow Control Valve.  New Old Stock  

SMC Pneumatics Model: ISE40-M5-62L Pressure Switch.    

SMC Cylinder Model: NVM12 Momentary Switch  

SMC Model: NCDA1B200-1000 Pneumatic Cylinder.  2IN. Bore, 10In Stoke   W 

Buschjost / IMI Norgren Model: 8235300.9300 Valve.  New Old Stock.  No Box  

SMC Cylinder Model: CQ2B12-25DC Cylinder 

Bosch Rexroth Model:3842-191-721 Switching Pup-Up Stop Gate.  Unused Old Stock  

SMC Cylinder Model: ZSE4B-T1-25 Pressure Switch  

Compact Air Products Model: AS138X512-RF Cylinder.  New Old Stock.  No Box 

Numatics Model: 152SA400M Solenoid Valve.  Unused Old Stock.  No Box  

Numatics Actuator Model: NL-347241-1 Cylinder  

Koganei Model: CS5B Pneumatic Sensor.    

SMC Model:  NVJ5140 Solenoid Valve Pack on Manifold.  Qty. 3.  24VDC 

Kuroda Model: PRN3S-90-90S-A Hi-Rotor  

Hoerbiger-Origa Model: P126-S/25X15-BM Rodless Cylinder  

Numatics Model: DB-0502-U Poppet Valve Solenoid  

NUMATICS 139-145P SOLENOID, New =

Hoerbiger-Origa Model: RK-FD 25S Aluminum Rail Guide.  Ident-No. 20520    

CKD Corporation Model: VYX-0071 Regulator Control  Valve     O

Norgren MH01GDA74AEFA  Air Control Valve, New In Box

SMC Pneumatics Model: NIR201 Precision Regulator.  Max Pressure: 100PSI   W2

Festo Model: GRL-1/8NPT  One Way Flow Control Valve.  New Old Stock  

Watts FluidAir WD-11863-501 Constant Fource w/R364-01B 

SMC Model: NVV5ZS-42-041-B9T Pneumatic Manifold  

SMC: Model: MXH6-15  Rodless Slide Air  Cylinder w/  D-A93 Sensor   

Lot of SMC Model: NVFS4100-5FZ  Solenoid / Pilot Valve with Manifold  

Myotoky LTD.  Model: CVA-10HR-VDN-24B Convum Valve   

TOL-O-Matic Model: CC10 SK37 / (CC#189988)  Cylinder  

GRACO Model: 165741 Pneumatic Hose.  New Old Stock  

Kuhnke Model: UF33-220VAC Relay with Comat CS-11 Base.  Gently Used!    

Kuhnke Model: UF33-220VacN Relay with Base.  Gently Used!    

American Cylinder: 750DV-12.00 Universal Mount Cylinder.  3/4" Bore x 12" Strok 

Bank of  Numatics 031SA4008 w/236-103B on Manifold   

Held AG  Model:  DA-16  Rotating Unit  

ARO Fluid Power Model:104196 Pressure Switch.  New Old Stock  

Vickers: DG4V-3S-6C-M-U-H5-60 w/ DG5S4-046C-T-M-U-H5-60 Direction Control Va W2 

Bosch Rexroth 0820025934 Valve w/ 1824210233  Solenoid & 0821300911 & 350 Reg. W

HUMPHREY T062E1 3 10 36 80 JB VALVE 120V 0-125 PSI.  Unused Old Stock  

Vickers: DG4V-3S-2A-M-U-H5-60 w/ DG5V-7-2A-E-M-U-H5-40 Direction Control Va W2 

Buschjost /  Norgren Magnetventil Mdl:  8212200.8001.02400 alve.  New Old Stk. 

Rams Inc. Model: RM375-24 Rod Alignment Coupler.  New Old Stock   

Vickers: DGMX2-5-PP-BW-S-30 Pressure Reducer.  Ass'y No. 867324.  315 bar   W2 

SMC Model: CXSJL2040 Ball Bearing Cylinder    

Vickers Model: DG4V-3-6N-M-W-B-40  Pilot Valve   

Numatics F10D-01 Coalescing Filter.  1/8" , 150 PSI Max.  

Hoerbiger-Origa Model: 72310-097 Rodless Cylinder.  phd: SGBM36 X 12-BB-H39-H4  

Ingersoll Rand / ARO Part Number: 637006-3 Pump Repair Kit.  H94   

Allied Witan AtoMuffler: M05.  ? Pipe Muffler / Silencer.   New Old Stock  

SMC Model: NCDME106-0200-G59 Round Pneumatic Cylinder.  

Buschjost / IMI Norgren Model: 9300 Coil.  New Old Stock.  No Box  

Lot of Compact Air Products S34X34 HTV Cylinders.  2 

 Kuhnke Cylinders Model: SP726-0029 Cylinder     

Kuhnke Cylinders Model: 87.030.01 Pneumatic Valve.       

Lucas Ledex Model  H2168-32 Rotary Solenoid.  New Old Stock  

Ingersoll Rand / ARO Model: 104068 Autodrain Assembly.  New Old Stock  

Hoerbiger-Origa Model: 68351-097 Rodless Cylinder  

Norgren Model: C0030E Lockout Valve w/ Norgren Solenoid     

SMC Pneumatics Model: AR20-02- Pneumatic Air Regulator.  New Old Stock  

SMC Pneumatics Model: CJ1B15-15 Cylinder   

Kuroda Model: PRN-20A-90-90 Hi-Rotor   

SMC Pnueumatic CDQ-2B40-10D-X202 Cylinder w/(2) D-A77  

Vickers: EHST-3-BIE-40 Proportional Pressure Control w/ Integrated Electronics W

ROBOHAND PST CYLINDER =

ROBOHAND PS CYLINDER PS-4-2SSH =

Swagelok: SS-4-VCO-7-4.  Qty. 2.  Size:  ? VCO, ? NPT Connection.  New Old St   

Kuhnke Cylinders Model: SP779.0006 Mini Air  Valve.       

Numatics FlexiBlok with: (3)  081SA400M000061 Valves and 2 Filters on Manifold  

Bosch Model: 7-782-386-009, WL2260 Signal Light.  220V; 40W; 50/60Hz  

(2) NUMATICS Solenoid 34DSA641F / 34SAD441F, New !!! =

LIN-ACT Model: STPE-4.00x2.00-4.00X2.00-4-B-V Cylinder.  Unused Old Stock.   

SMC: Model: MXQ25-75B-M8PVSAPC Slide Table      W

SMC: Model: MXS12-20 Pnuematic Dual Rod Cylinder Slide w/ (2) D-F9PW Sensors   W

Hoerbiger Model: CR-3/8-US Pressure Regulator Valve with Gauge.   

SMC: Model: CXSM15-20 Dual Rod Cylinder w/ (2) D-Y7P Sensors    W

SMC: Model: MGPL40N-50 Dual Rod Cylinder w/ (2) Turck 4623502 Prox. Sensors    W

SMC: Model: MGPL25N-40 Dual Rod Cylinder w/ (2) Turck 4623502 Prox. Sensors    W

SMC: Model: MGPL16-40 Dual Rod Cylinder    W

SMC Model: NCA1F325-1300-XE57  Pneumatic  Cylinder w/ Mlok RCA-100325-60S   

Copal Electronics Model: PS3-102 Adj. Pressure Switch  

SMC: Model: MGPL20N-40 Dual Rod Cylinder w/ (2) Turck 4623502 Prox. Sensors    W

SMC: Model: MGPL20N-40 Dual Rod Cylinder    W

SMC Model: CDRB1BW50-90D Actuator *W2

SMC Model: CDRB1BW50-180S Actuator *W2

SMC: Model: CXSM25-20 Dual Rod Cylinder w/ (2) D-Y7P Sensors    W

Sanwa Denki Model: SPS-8T Automatic Control Switch   

CKD Corporation Model: AB41-02-2 Solenoid Valve  

CKD Corporation Model: HVB41 Solenoid Valve  

SMC: Model: CXSM25-40 Dual Rod Cylinder w/ (2) D-Y7P Sensors    W

Destaco Model: DLT-12-L-C-S Pneumatic Linear Motion Actuator  W

SMC Model: NVZ110-5G-M5 24V DC Solenoid Valve  

Festo Model: ADV-25-10-A Cylinder.  Part Number: 14912.  New Old Stock,  No Bx  

Compact Air Products Model: ABD34X114 Cylinder.  New Old Stock 

Compact Air Products Model: AS34X212 Cylinder.  New Old Stock 

Humphrey Model: 3E1 Solenoid Valve, 5V DC.  New Old Stock  

BuTech Model: SLPV41V-A7 Pressure Valve with BuTech SLP41V-AT05  

Lot of Festo Model: GRL-?NPT Flow Control Valve.  Qty. 2    

Aladco NU-Check Valve Model:  305001 ?" NPTF Pilot Single w/ Override    

Lot of Compact Air Products Valve, 7.  See List Below  

Numatics: 554BB43AMT00061 Solenoid Valve Ass'y w/ (2) 225-384B & Manifold  

Numatics: 153SS43AM000061 Solenoid Valve Ass'y w/ (2) 225-372B & Manifold  

Koganei Model: PBSA6x13 Pneumatic Cylinder  

SMC Model: NCDQ2A20-25DM Cylinder w/ SMC NJ10-32 Alignment Coupler   W

Dwyer Series 1800, Model: 1910-10 MR Pressure Switch.  New Old Stock  

Clippard / Minimatic: R-421 4-Way Valve with Clippard CM-02 Subplate  W2

Compact Air Products Model: SD34X12 Cylinder.  Unused Stock.  No Box 

Compact Air Products Model: Q91-2404-B Cylinder  

Graco Model: 061-221 Pneumatic Hose.  3/8" Diameter, 60" Length.  New Old Stock 

SMC Pneumatics Model: VT301-021G  Solenoid Valve.  AC100V     

AFAG Model: GMQ 32/P Rotary  Gripper.    W

NUMATICS IH-130739-1 X0EF-12A3B-AAA2A ACUTUATOR NEW  

MERCER Board P/N: 033X056, =K

Kuhnke Model: UF3-24V DC N Relay with Comat CS-11 Base.  Gently Used!    

Rexroth Bosch Model: 3-842-168-820 Switch Bracket.  New Old Stock  

SMC Model: VZ3240-WZ Solenoid Valve, 24V DC  

Material Research Corp.  5030750 2-Way Valve, Qty 2 

SMC Pneumatics Model: GS-40 Pressure Sensor    

Ross Model: 2773A4072 Solenoid Lockout Valve w/ Norgren Quietaire  Muffler    

HUNTINGTON LABS MODEL: PES-150 VALVE S/N-20821-3  

Clippard Minimatic: 9SD-1 Cylinder. 9/16" Bore 1" Stro 

C.A. NORGREN F1013H-22-A1 3/8 CONTROL VALVE  

Bank of  Numatics w/: (5) 031SA4154; (6) 031RS700O-279 & (1) 031SA4004, Guages  

Bank of  Numatics w/: (2) 031SA4154; (5) 031SS4154011Z & (1) 031SA4004 (1) 031S 

Pneumatic Products Corporation PN: 1200453 Repair Kit  

Bank of  Numatics w/: (3) 031SA4154; (5) 031SA4004000061; (1) 031SA4004 & (6)   

Bank of  Numatics w/: (1) 031SA4154; (1) 031SA4004000061; (3) 031SA4004; Guage  

Advance Automation Model: 240 Cylinder, 30 Stroke   

Bank of  Numatics with (4) / 081SS400M,  on  FlexiBlok Manifold  

Bank of  Numatics w/ (4)  031SS4154011Z Valves & Turck:  PKW 3Z 0.9-PSG  3 Cbls 

Bank of  Numatics w/: (1) 031SA4154 Valves on 031RS700O Pressure Regulators   

AFAG Model: LM40 Pneumatic Linear Module for Longitudinal Motions   W

Kuroda XC Cylinder with MT-3U and MT-3 Sensors  

SMC Cylinder Model:  ISE4-T1-65 Pressure  Switch   

Bimba EF1,  Model: EFD-1225-EEE20 Pnenumatic Cylinder.  New Old Stock   

Bimba  Flat-1 Model:  FS-040.5 Pnenumatic Cylinder.  Gently Used Stock  

Vickers: DG4V-3S-6C-M-FPA5WL-B5-60 Direction Control Valve.  New Old Stock   

Swagelok Model: SS-220-3TT 316SS Tee.  New Old Stock    

Vickers Model: 919305 Seal Kit.  New Old Stock.    

Robohand Model: PST-5-2 Pneumatic Cylinder.  New Old Stock   

Alkon Corporation: BF1-1 2X24....DC#2Y4 Cylinder