3A99860G01西屋等你來

3A99860G01西屋等你來

I/O總線，它把多種I/O信號送到控制器，由控制器讀取I/O信號。這稱為I/O總線。I/O板相互之間并不交換數(shù)據(jù)。I/O總線的速率是不高的。從幾十K到幾兆不等。這與計算機技術的發(fā)展情況有關。80年代初是20K，80年代中期是40K、80年代末期是80K，90年代是幾兆。為了快速，是并行總線。采用并行總線，其I/O模件必需與控制器模件相鄰。采用串行總線的情況下，I/O板和控制器之間的距離也要比較近才行。把控制器模件和I/O模件裝在一個機柜內(nèi)或相鄰的機柜內(nèi)。遠程I/O應該采用現(xiàn)場總線。如CAN、LONWORKS、HART總線等。現(xiàn)場總線是90年代初發(fā)展起來的。在I/O板中從硬件來說應該有能接收現(xiàn)場總線來的信號的輸入、輸出板。從軟件來說在控制器中應該有讀取和寫到現(xiàn)場總線信號的功能塊。在DCS系統(tǒng)中，遠程I/O采用HART總線比較多。比如現(xiàn)場的變送器，離控制器機柜距璃比較遠，把16個變送器來的信號編成為一組，用HART總線把信號送到控制器，空制器同時讀進16個變送器來的信號。控制器和變送器兩者距離可達1公里以上。在從美國、歐洲進口的DCS系統(tǒng)中，幾乎都有HART協(xié)議板。實際應用中，遠程信號是比較多的。如水泥廠，回轉(zhuǎn)窯的窯頭與窯尾，兩者距離有幾百米，如果在網(wǎng)絡上設兩個結點，需要兩套結點的接口模件，接口模件的費用比較高，如果設一個結點，在地理位置上不管結點安排是在窯頭還是窯尾，都需要采用遠程I/O。
在DCS網(wǎng)絡中，數(shù)據(jù)傳輸是以信息幀的形式傳輸?shù)摹Ｋ峭桨l(fā)送星息。半雙工發(fā)送。雙工發(fā)送的極少。每一幀信息都有信息頭，信息尾，信息幀中緊跟首旗的是地址，其中包括信號發(fā)出的結點的源地址，如結點號、模件號、功能塊號以及接收信息的結點的目的地址，如結點號、模件號和功能塊地址。信息幀的中間是數(shù)據(jù)，再后面是校驗。校驗zui多的是采用循環(huán)冗余校驗。CRC碼是一種高效能的檢錯和糾錯碼。數(shù)據(jù)在傳輸過程中，可以是一幀，也可以是兩幀，如果是兩幀，頭幀是旗，第二幀才是數(shù)據(jù)。zui長的一幀信息可長達200多個字節(jié)。采用存儲轉(zhuǎn)發(fā)協(xié)議的網(wǎng)絡中，當一個結點發(fā)生故障時，把這個結點旁通，讓信息通過。

BIMBA S/S d-82316-a-1 d82316a1 3 11/16" - 4 11/16" AIR PNEUMATIC CYLINDER NEW

PARKER 1.50NSR01.0 4 7/8" - 5 7/8" AIR PNEUMATIC CYLINDER NEW

REXROTH 522 673 480 0 AIR PNEUMATIC CYLINDER NEW

LIN-ACT M86-394 MD-1.125X1-N DUAL ACTING AIR CYLINDER

Koganei Air Cylinder Slim 3" stroke DAB16x75-2 NEW

Lot of 3 Hydro-Line CSK-35-23 Seal Kit CSK3523 New

ALLENAIR A-2-1/2 X 2-NT A212X2NT 8" - 10" 2 1/2" BORE AIR PNEUMATIC CYLINDER NEW

CKD SSD-L-12-5 SSDL125 1 13/32" - 1 19/32" AIR PNEUMATIC CYLINDER NEW

New Koganei Air Cylinder PBDAW 16X11X11 PBDAW16X11X11

New SMC Cylinder CM2C32-320A 9.9 kgf/cm2 150 PSI

PNEUMAX 2420A0291 17 1/2" - 26 1/2" AIR PNEUMATIC CYLINDER NEW

New Rexroth Air Cylinder 521 165 000 0 5211650000 150PS

MECMAN REXROTH PNEUMATIC CYLINDER ACTUATOR 63MM BORE X 28" STROKE 170-360-0280

Compact Air Products Cylinder GCD212X1 1" stroke NEW

NORGREN AIR CYLINDER RLD00P-DAN-AA00 250-PSI NEW

REXROTH 323 806 000 0 PNEUMATIC AIR PNEUMATIC CYLINDER 

ITT Conoflow Pneumatic Piston Actuators GB511041 3 Stroke 3-15 PSI Used

SCHRADER BELLOWS 30911-0120 309110120 FIXED EYE AIR PNEUMATIC CYLINDER NEW

Rexroth Cylinder 1" stroke 521 165 606 0 5211656060 NEW

JOHNSON SERVICE 9007 8-13 DAMPER ACTUATOR 1/8" NPT 

ARO 10" CYLINDER ECONOMAIR 2340-5009-020 NEW

Servomech Actuator M56B4 220/380V .12HP 3 Mot. IP65

BIMBA BF-041.5-D BF0415D 5 1/2" - 7" STAINLESS S/S AIR PNEUMATIC CYLINDER NEW

COMPACT SD34X112-FT SD34112FT 1 1/2" APPROX. TRAVEL AIR PNEUMATIC CYLINDER NEW

SHEFFER CLAD6 CLA-D6 8 15/16" - 14 15/16" AIR PNEUMATIC CYLINDER NIB

CHICAGO CYLINDER MR1-A-1-1/2X3-5/8-SM-NC NEW

New SMC Pneumatic Air Cylinder ECDQ2B32-20D Z-1293

MRC 7206DU-0001 Steel/ABEC-1 Bearing 7206D New

HOERBIGER P126 P126 20X4-5-14 48" STROKE AIR PNEUMATIC RODLESS CYLINDER REBUILT

Johnson Controls Diaphragm Actuator V-3000-1 w. 1-1/2" NPT Brass Bronze Valve 

ARO 0176-1019-020 6 1/2" - 8 1/2" MICRO-AIR AIR PNEUMATIC CYLINDER

Inline Pneumatic Actuator w. 1-1/2" NPT Ball Valve AP-SR-100-B-N APSR100BN New

BIMBA FLAT-1 FS-090.75-MT FS09075MT 2 5/8" - 3 3/8" AIR PNEUMATIC CYLINDER NEW 

NEW JOHSON CONTROLS M9116-AGC-2 M9116AGC2 ELECTRIC MOTOR ACTUATOR 24VOLT 0-90

SCHRADER BELLOWS AIR CYLINDER FAC100821 2" STROKE NEW

SMC CJPB10-20D AIR PNEUMATIC CYLINDER NEW

PARKER ACTUATOR PTR151-1803FP-AB21M-C 250PSI 7/8" NEW

Triac Doulbe Acting Rack & Pinion Actuator 2R80DA New in Box

FESTO AIR CYLINDER ADVU-20-80-P-A ADVU2080PA NEW

Festo Magnet Air Cylinder DNU-80-200-PPV-A 5-3/4 Stroke

HUMPHREY 5-SRP-7 5DRP7 SPRING EXTRACTED AIR PNEUMATIC CYLINDER NEW

HYDRO-LINE CYLINDER LR2E 4X11 1C8706-0970-2B 11" 3/4"

Schneider T.A.C Pneumatic Damper Actuator MK-3101-0-2 MK310102 3-1/2" Stroke New

Compact Air Cylinder ASFH34X134-EX114FT 1 3/4" str NEW

Compact Air Cylinder R138X12 NM A138X12-NM 1/2" str NEW

LIN-ACT A2B-2.5X15-HC-2 A2B2.5X15HC2 AIR PNEUMATIC CYLINDER NEW

HUMPHREY 25-D2EY-1 AIR CYLINDER 7/16" 9" LENGTH NEW

Compair Air Cylinder C16DE025 C16DEO25 3/4" stroke NEW

No Name Coil 6375538G2 New

BOSCH AIR CYLINDER 0 822 351 600 0822351600 STROKE 1"

PARKER CYLINDER SER 2A 1" KJ2A KJ2ALU13A13A KJ2ALU13A

FESTO DSNU-20-50-PPV-A-Q DSNU2050PPVAQ 7 1/2" - 9 1/2" AIR PNEUMATIC CYLINDER 

BRAY 90-1270-21321-532 AIR PNEUMATIC ACTUATOR 140 PSI W/ 8" BUTTERFLY VALVE 

New Miller Air Cylinder AL4-84B2B-04.00-20.000-0100-N11M-9

Compact Air Cylinder ASHH11X1 1" stroke NEW

FESTO 1" AIR SPRING LOADED CYLINDER DSN-25-25-PA-SA NEW

PARKER 03.25 TC2AU14 6.000 PNEUMATIC CYLINDER W/ CLEVIS

SMC CQ2B 20-50DC DQ-DE AIR PNEUMATIC CYLINDER NEW

New Aris Actuator 0717-65603-01001 N-1G 18VA 90° 2ZW

ORIGA PNEUMATIC DRIVE 210/20 PNEUMATIC DRIVE 29580 NEW

NEW BOSCH AIR CYLINDER 0 822 351 021 0822351021 1/4" NPT 40/150

NORGREN DTF 5/16-REV. #0 10 3/8" DUAL ACTING AIR PNEUMATIC CYLINDER NEW

BAHR MODULTECHNIK LINEAR ACTUATOR MODULE 11059 NEW

NORGREN EDJ0955A1 A6-TX  DUAL ACTUATING AIR PNEUMATIC CYLINDER REBUILT

PENINSULAR 020508 HP28200A 15 1/4" - 22 1/4" AIR PNEUMATIC CYLINDER NEW

NEW WORCESTER PNEUMATIC VALVE ACTUATOR A34 SERIES 34 125PSI

PENINSULAR 1500 PSIG LH28200B 7 1/2" - 8" AIR PNEUMATIC CYLINDER NEW 

AMETEK GEMCO 950MD LINEAR DISPLACEMENT TRANSDUCER 950MD120A05B05CC5A343145 NEW

BIMBA STAINLESS S/S BR-092 BR092 7 1/4" - 10 1/4" AIR PNEUMATIC CYLINDER NEW

PARKER 1.50DSR10.0 14 1/2" - 24 1/2" AIR PNEUMATIC CYLINDER NEW

PNEUMAX 2420070011 PNEUMATIC CYLINDER 5" STROKE 10 BAR

PHD Inc. Air Cylinder ML-204889 ML-204889 1" stroke NEW

Masoneilan Regulator 3/4" NPT 20-225 20225 New

BOSTON GEAR E15-15DC1-1040 E1515DC11040 73280 070186 AIR PNEUMATIC CYLINDER NEW

FESTO DMM-20-10-PA J808 AIR PNEUMATIC CYLINDER NEW

URBAN ED 50/145 10BAR AIR PNEUMATIC CYLINDER NEW

Diablotek ATX Power Supply DA Series PSDA400 400 Watt 115/230 VAC SEALED 

ARO ECONOMAIR 2420 1009 300 24201009300 36" - 66" AIR PNEUMATIC CYLINDER NIB

BIMBA STAINLESS S/S 7014-DXP 7014DXP 22 1/4 - 36 1/4" AIR PNEUMATIC CYLINDER NEW

TRD TA-MP1-2 X 4.25-HC-MP TAMP12425HCMP 2" X 4 1/4" AIR PNEUMATIC CYLINDER NEW

Compact Air Cylinder GCD2118X2 2" stroke NEW

LYNAIR H-E142 1" STROKE CYLINDER NEW

BOSCH R160520131 16 1/4"LINEAR BEARING RAIL NEW

HUMPHREY 6-BFD-B M 6BFDB 10 3/4" - 16 3/4" AIR PNEUMATIC CYLINDER NEW

CVP D-45672-A-.5 D45672A5 4 1/4" - 4 3/4" AIR PNEUMATIC CYLINDER NEW

COMPAIR C16DE50 10BAR MAX AIR PNEUMATIC CYLINDER NEW

Koganei Air Cylinder DAB16x752 DAB16 2 7/8" stroke NEW

CVP SYSTEMS 7707-980 7707980 D-38243-A D38243A AIR PNEUMATIC CYLINDER NEW

PHD AF3/4X1-P AF34X1P 4 1/4" - 5 1/4" AIR PNEUMATIC CYLINDER NEW

HYDRO-LINE N5CM-3.25X3 AIR PNEUMATIC CYLINDER NEW

PARKER  MA 04.00 CHMAUS14AC 9.750 200 PSI CYLINDER NEW

SCHRADER BELLOWS FW2B102421 3.000 ECONO-RAM II AIR PNEUMATIC CYLINDER NEW

HOERBIGER P126-S/25X60-VM 60" STROKE AIR PNEUMATIC RODLESS CYLINDER REBUILT

SMC CQ2B12-20DC CQ2B1220DC 41MM - 61MM AIR PNEUMATIC CYLINDER NEW

SMC NCDGBA50-0300 145 PSI AIR PNEUMATIC CYLINDER NEW

SCHRADER BELLOWS PND118421 1.000 CYLINDER 10.75" EXT L

SMC NCDQ2B40-50D NCDQ2B4050D 3 25/32" - 5 25/32" AIR PNEUMATIC CYLINDER NEW

SMC CD85N12-40-B CD85N1240B 5 3/4" - 7 1/4" AIR PNEUMATIC CYLINDER NEW

BRAY DOUBLE ACTING ACTUATOR 90-0830-21320-015 90083021320015

(4) ORTLINGHAUS ROTARY JOINT SEAL RING 860001627159000

BIMBA FLAT-1 FO-041.5 FO0415 2 3/16" - 3 11/16" AIR PNEUMATIC CYLINDER NEW

ITT CONOFLOW 3B50XCACXX05000 AIR PNEUMATIC VALVE ACTUATOR 6" STROKE 3-15 PSI 

MILLER FLUID POWER AL74B5N 22 1/2" - 39 1/2" AIR PNEUMATIC CYLINDER 1-1/2" BORE

MILLER FLUID POWER AL71B2B 1 1/2" BORE 14 3/4" - 22 3/4" AIR PNEUMATIC CYLINDER

CHICAGO DP-12-2-V DP122V 7 1/2" - 9 1/2" AIR PNEUMATIC CYLINDER NEW

NUMATICS RK-512918-3 T6EQM-10A3D-DAA0 AIR CYLINDER 2-1/2" BORE 10.000 STROKE

SCHRADER BELLOWS 02.00 SPU16 14.000 20 1/2" - 34 1/2" AIR PNEUMATIC CYLINDER NEW

UNKNOWN BRAND AIR PNEUMATIC CYLINDER 165MM STROKE 63.5MM SHAFT 47.5X12 THREAD

Allen Bradley Overload Relay 592-A2JD Ser A 14-45A 

TRUE BLUE AIR ACTUATOR ABVA 1.2, ABVS 1.2 50/80 PSI 5.5 BARS

FESTO AIR CYLINDER DNU-40-128-PPV-A DNU40128PPVA 175PSI

FESTO DSNU-63-170-PPV-MQ DSNU63170PPVMQ 13 3/4" - 20 1/4" AIR PNEUMATIC CYLINDER

FESTO DC-35-15-PPV DC3515PPV R314 AIR PNEUMATIC CYLINDER NEW

REXROTH 0 822 406 340 0822406340 27MM - 30MM AIR PNEUMATIC CYLINDER NEW

COMPAIR CT032U0030 PNEUMATIC AIR CYLINDER NEW

LIN-ACT 01.50 ST-1.50X2.25-4 AIR PNEUMATIC CYLINDER NEW

PENINSULAR 070705 LM24200A 2" BORE 10 1/4" - 13 1/4" AIR PNEUMATIC CYLINDER NEW

MILLER FLUID POWER J61R2B 18 3/8" - 31 3/8" AIR PNEUMATIC CYLINDER NEW

COMPACT SD34X312 4 1/2" TRAVEL AIR PNEUMATIC CYLINDER NEW

REXROTH 0 822 406 350 0822406350 1 1/16" - 1 1/4" AIR PNEUMATIC CYLINDER NEW

COMPAIR CN032U75 AIR PNEUMATIC CYLINDER NEW

New Koganei Air Cylinder PBDATS 16x12x0-7 -1325W

PENINSULAR 250 PSIG LM2200A 2" BORE 8" - 10" AIR PNEUMATIC CYLINDER NEW 

SCHRADER BELLOWS PHCA16131 24.000 31 1/4" - 55" AIR PNEMATIC CYLINDER NEW

ALLENAIR A-3 X 5-3/4 BC-NT 11 1/2" - 17 1/4" AIR PNEUMATIC CYLINDER NEW

HUMPHREY 5-DP-2 5DP2 7 1/2" - 9 1/2" AIR PNEUMATIC CYLINDER NEW

JOSEPH SST-1.12X1.00-4 AIR PNEUMATIC CYLINDER NEW

COMPACT RHH2X112-CBSS34HYD 12/07 AIR CYLINDER NEW

PNEUMAX 9242001000 47D 20" - 26" MAGNETIC AIR PNEUMATIC ACTUATED CYLINDER

HALLITE 373379 9 3/8" - 11 3/4" AIR PNEUMATIC CYLINDER REMANUFACTURED 

BIMBA AB-50-500-CB AB50500CB PNEUMATIC AIR CYLINDER NEW

WORCESTER CONTROLS SERIES 34A R4 PNEUMATIC ACTUATOR MK003 125 PSI 160 IN LBS

KEYSTONE 120-790-501 120790501 AIR PNEUMATIC ACTUATOR

COMPAIR CT040U0200 E90 AIR PNEUMATIC CYLINDER NEW

SPEEDAIRE 6X385A 15 3/8" -25 3/8" AIR PNEUMATIC CYLINDER NEW

CLIPPARD MINIMATIC SDR 32 15 SDR3215 PRECISION S/S AIR PNEUMATIC CYLINDER NEW

KEYSTONE TYCO 790-600S AIR PNEUMATIC ACTUATOR SINGLE ACTING 80LB FAIL CLOSE

MRC 7206DU-H701 Steel/ABEC-1 Bearing 7206 New

CAMOZZI Air Cylinder 24S7A25A036TFS01 23GL 1.5" str NEW

WORCESTER CONTROLS SERIES 34A R4 PNEUMATIC ACTUATOR 125 PSI 160 IN LBS

BIMBA FLAT-1 FS-314.5-LM AIR PNEUMATIC CYLINDER NEW

Compact Air Cylinder ASFH34X7 EX 1/2" 7" stroke NEW

Catching Eng Cylinder HP-11-A-32-TV-7 2" stroke NEW

New Rexroth Air Cylinder 521 185 038 0 5211850380 150PS