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廈門仲鑫航自動(dòng)化設(shè)備有限公司
主營產(chǎn)品： 模塊 plc 備件 控制器 驅(qū)動(dòng)器 |
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廈門仲鑫航自動(dòng)化設(shè)備有限公司
主營產(chǎn)品： 模塊 plc 備件 控制器 驅(qū)動(dòng)器 |
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更新時(shí)間：2015-05-27 18:04:02瀏覽次數(shù)：113
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HIMA F7126HIMA F7126
PLC的工作原理
PLC是一種工業(yè)控制計(jì)算機(jī)，它的工作原理建立在計(jì)算機(jī)工作原理之上，即通過執(zhí)行反映控制要求的用戶程序來完成。
1.4.1 PLC可編程控制器的基本工作原理
PLC以微處理器為核心，具有微機(jī)的許多特點(diǎn)，但它的工作方式卻與微機(jī)有很大不同。
微機(jī)一般采用等待命令的工作方式工作。
PLC是按集中輸入、集中輸出，周期性循環(huán)掃描的方式進(jìn)行工作的。每一次循環(huán)掃描所用的時(shí)間稱為一個(gè)掃描周期。
對(duì)每個(gè)程序，CPU從*條指令開始執(zhí)行，按順序逐條地執(zhí)行指令做周期性的程序循環(huán)掃描，如果無跳轉(zhuǎn)指令，則從*條指令開始逐條順序執(zhí)行用戶程序，直至結(jié)束又返回*條指令，如此周而復(fù)始不斷循環(huán)。
PLC在每次掃描工作過程中除了執(zhí)行用戶程序外，還要完成內(nèi)部處理、輸入采樣、通信服務(wù)、程序執(zhí)行、自診斷、輸出刷新等工作。PLC工作的全過程包括三個(gè)部分，即上電處理、掃描過程和出錯(cuò)處理。PLC工作的全過程可用圖4所示的運(yùn)行框圖來表示。
鄭娟萍
廈門仲鑫航自動(dòng)化設(shè)備有限公司
在圖4中，PLC通電后，CPU在系統(tǒng)程序的控制下*行內(nèi)部處理，包括硬件初始化、I/O模塊配置檢查、停電保持范圍設(shè)定及其他初始化處理等工作。
PLC有很強(qiáng)的自診斷功能，PLC每掃描一次執(zhí)行一次自診斷檢查，確定PLC自身的動(dòng)作是否正常，如電源檢測、內(nèi)部硬件是否正常、程序語法是否有錯(cuò)等。如檢查出異常時(shí)，CPU面板的LED及異常繼電器會(huì)接通，在特殊寄存器中會(huì)存入出錯(cuò)代碼；CPU能根據(jù)錯(cuò)誤類型和程度發(fā)出信號(hào)，甚至進(jìn)行相應(yīng)的出錯(cuò)處理，使PLC停止掃描或強(qiáng)制變成STOP狀態(tài)。
PLC運(yùn)行正常時(shí)，掃描周期的長短與用戶應(yīng)用程序的長短、CPU的運(yùn)算速度、I/O點(diǎn)的情況等有關(guān)。通常用PLC執(zhí)行1KB指令所需時(shí)間來說明其掃描速度（一般1-10ms/KB）。值得注意的是，不同指令執(zhí)行時(shí)間是不同的，故選用不同指令所用的掃描時(shí)間將會(huì)不同。若用于高速系統(tǒng)要縮短掃描周期時(shí)，可從軟硬件上同時(shí)考慮。PLC周期性循環(huán)掃描工作方式的顯著特點(diǎn)是：可靠性高、抗*力強(qiáng)，但響應(yīng)滯后、速度慢。
NEW INA DOUBLE ROW BEARING 4207 F0623
Fafnir 1107KRRC1 Bearing 1107KRRC1 1107KRR C1 New
NEW DODGE FLANGE BEARING 057708 F4B-SCM-307-HT F4BSCM307HT 3-7/16" BORE 3716
NOS LINK-BELT REXNORD PB22543H P-B22543H 2-11/16" PILLOW BLOCK BEARING 2 11/16"
NEW SEAL MASTER BALL BEARING INSERT AR-2-012 AR2012 3/4" 6-4-98 6498
NEW NO NAME CLOSED PILLOW BLOCK LINEAR BEARING 89507 1043010
NEW BOWER MS 1311 BEARING WITH METAL RING WN61219
NEW BLUE BRUTE 4 BOLT FLANGE BEARING QMF10J115S
NTN Insert Bearing w. Collar A-UEL211-200D1W3 AUEL211200D1W3 A-UEL211-200 NEW
NEW BROWNING 4 BOLT FLANGE BEARING W/SET SCREW VF4S-323 VF4S323 1-7/16" BORE
Fafnir Insert Bearing w/ Collar MUA 1-15/16 W/ 1115 KR MUA11516W1115KR New
MRC Ball Bearing 307 SF 307SF ABEC1 35X80X21MM New
Boston Pillow Block Bearing 06912 4L 3/4 069124L34 3/4" A-AL204-012 AAL204012
MRC 208RDS Super Precision Angular Contact Bearing Set/Pair 208RDS New
NOS DODGE S1USD307 3-7/16" SPECIAL DUTY BEARING 3 7/16"
NEW NACHI SNAP RING BEARING 6309-2NSL 63092NSL
MRC TRW Single Row Ball Bearing 124 KS 124KS NEW
DANLY CAGE BEARING BUSHING 6-1006-821 61006821 NEW
New American Roller Bearing Co Needle Bearing AWRA218H
NDH Delco Hyatt Roller Bearing RA308 7124 New
MRC Double Row Roller Ball Bearing 5315M New
NEW FAFNIR 2MM 9113WIL 2MM9113WIL 9113WI BALL BEARING
NEW NSK 22316EAKE4C3 LARGE SPHERICAL ROLLER BEARING
NEW SKF 2208 E-2RS1KTN9 2208E2RS1KTN9 RUBBER SHIELD BALL BEARING
FRANKE LFC 12 ROLLER BALL BEARING NEW 12-3/4" OD 3/8" Width
NEW RBC KF055CP0 THIN SECTION BALL BEARING KF055CP0 RBC WO7420 KF055CP0RBC
FAG Spherical Self Aligning Roller Bearing 23026E New
No Name Single Groove Radial Ball Bearing with Snap Ring 64 RIV 64RIV 15BBNON
Nyla-K MB 2-Bolt Flange Bearing C-25-1 11/16 C2511116 1-11/16" Bore New
NEW BROWNING 4 BOLT FLANGE BEARING SFB1100NEX SFB1100NE 1-15/16" BORE 11516
SealMaster Seal Master Flange Bearing MFC-35T MFC35T 2 3/16" Bore New
NEW HUB CITY 2 BOLT FLANGE BEARING W/COLLAR FB230X5/8 FB23058 5/8" BORE
MRC Roller Bearing 205 M 205M ABEC-1 ABEC1 01-ST-A-004A 01STA004A New
Fafnir Single Row Ball Bearing 203KTT 17MM ID 40MM OD New
KOYO BEARING 6211ZZC3 GXM 6211ZZC3GXM 6211ZC3 NIB
Fafnir Insert Bearing 1114KRR No Collar New
PTI 2 BOLT PILOT FLANGE BEARING OWFZ207-35AMM NEW
NEW SEAL MASTER SEALMASTER FLANGE BEARING SF-21 SF21 1 5/16"
SealMaster Stainless Steel S/S Flange Bearing CRFS-PN32 CRFSPN32 New
Timken Double Race Assembly Tapered Roller Bearing 659 90033 New
Blue Brute Bearings 2-Bolt Pillow Block Bearing QMP10J115SET New
SNR Sealed Roller Ball Bearing 6013 ZZJ30A50 6013ZZJ30A50 6013 J30 6013J30 New
SEALMASTER PILLOW BLOCK BEARING NP-18 NP18 1-1/8" 7001823 NIB
Kellam Gear Sprocket 55-11T 5511T 11 Teeth 1-15/16" Bore New
NEW TIMKEN TAPERED ROLLER BEARING 30208 92KA1 Y-30208 Y30208 X30208
NEW INA 2 BOLT FLANGE BEARING 01CJTZ07 GAY 35 NPPB GAY35NPPB
Koyo Spherical Roller Bearing 22213 RW33C3FY 22213RW33C3FY 22213W33 New
TB Woods Variable Speed Pulley RC80 1-1/8" 3HP 1750 RPM New
SKF Deep Groove Ball Bearing w/ Snap Ring 6313 NRJEM 6313NRJEM 6313 N/C3 New
NEW SKF BEARING 6304 ZJEM 6304ZJEM 6304-Z/C3 6304ZC3
NEW The General Roller Bearing BR7-23 BR723 BR7 23
FAFNIR Ball Bearing S3PP FS50160 NEW
NEW PACAMOR SINGLE ROW BALL BEARING 77R-18 77R18
NEW CONSOLIDATED SEALED ROLLER BEARING LS-10-2RS LS102RS
NEW FAFNIR INSERT BEARING WITH COLLAR RA102PPB
ZKL Bearing 6204A-2Z CSFR 6204A2ZCSFR New
NEW THK LINEAR BLOCK BEARING SSR20XW1SS SSR-20W Y1M06 "LOT OF 2"
Hub City Mounted Bearing B250x 3/4 B250x3/4 New
Koyo Sealed Ball Bearing 62082RDC3 6208RD New
NEW NTN BEARING UC310 UC310D1
NEW PACIFIC FM30 LINEAR BEARING FM-30 1557267
NEW TIMKEN TAPERED ROLLER BEARING 66462B
NEW MRC TRW BEARING 312M 0002 312M0002
HUB CITY FB72-4 1-7/16 FLANGE BEARING NEW
SIEMENS LF111N 30A 30 A AMP 120V TYPE 1 UNFUSED SAFETY DISCONNECT SWITCH NEW
TRANE GP283-EE1-GA GP283EE1GA 200-230V 1PH 60HZ REFRIGERATION AC COMPRESSOR NIB
FYH Pillow Block Mounted UPC 312 UPC312 16R1 J102 New
NEW SEAL MASTER SEALMASTER TB-18 PILLOW BLOCK BEARING 1 1/8" SHAFT 2-12 TB18
NEW FAFNIR GN104KRRB BEARING W/ SN104K COLLAR
ADI Needle Bearing w/ Inner Race NU 5215 MC3 New
McGill Cam Follower Bearing CF 2 3/4 SB CF234SB 2-3/4" New
ERHARDT+LEIMER SQUARE D NT5304 NT 5304 PUSH BUTTON CONTROL SWITCH NEW
Osborn Flanged Yoke Bearing FLRY-3 1/4 FLRY314 96225 New
NEW ABEL VALVE BALL 50 MM 50MM 316 S/S stainless D 50 D50 1.4401
NEW HUB CITY PILLOW BLOCK BEARING PB250NX1 1" BORE
NEW MORSE ROLLER BEARING CARTRIDGE INSERT 550107 2 1/4"
SKF Tapered Roller Bearing 72200CVQ273 72200C/VQ27372200C VQ273 New
STANDARD BEARING ADAPTER KIT 26 X 4.438 BORE: 4.42" NIB
NEW SKF 71917 CD/P4ADGA Precision Bearing 71917CD/P4ADGA 71917-CD/P4ADGA
Fafnir Bearing With Collar 1100KRR+COL 1100KRRCOL New
Schatz Insert Bearing w/ Snap Ring WE520 New
NEW FAFNIR BALL BEARING G1103KRR 8-T G1103KRR8T
SKF Shielded Ball Bearing 6315 2ZJ/EM 63152ZJEM 6315-2Z 63152Z New
SKF Spherical Roller Ball Bearing 22213 CCJ/W33 22213CCJW33 22213 CC/W33 New
NEW FAG ROLLER BALL BEARING 6211 2RSR C3 62112RSRC3
MAKINO CIRCUIT BOARD CARD CB-4 T6J01-00 T6J0100
NEW INPRO/SEAL AY58293A-BZV BEARING ISOLATOR 1000-A-17174-5 1K118ABZV 1.375 BORE
NEW DEL-TRON LINEAR BEARING ROLLER RD-1 RD1
NEW NSK 22319CAMKE4C3 LARGE SPHERICAL ROLLER BEARING
SKF NNU 4922 BK/SPW33 Precision Bearing NNU4922BKSPW33 NEW
MOBIL XHP 222 XHP222 LITHIUM COMPLEX GREASE PETROLEUM OIL LUBRICANT 35.2 LBS NEW
DODGE TAKE-UP BEARING 023155 TP-E-207R TYPE E 2-7/16" INCH
NEW LPM FAN KIT 000-399-9912 0003999912 12V
AMI 2-BOLT FLANGE BEARING UCFL212 NEW
2) IKO LINEAR BALL BEARING ST 122332 ST122332 ST1 NEW
NEW KOYO CYLINDRICAL ROLLER BEARING NU307C3
EBC Sealed Rubber Ball Bearing 6004 2RSC3 60042RSC3 New
NEW RHP BEARING 3203B2ZR C3 3203B2ZRC3 3203B2ZRTNH
FALK GEAR COUPLING 1203270 1050G20 10" BORE 15" DIAMETER W/ SEAL KIT 0729160
NEW SST CONVEYOR ROLLER END BEARING 15/32" ID 1-23/32" OD FLANGE OD - 1-53/64"
INA Needle Roller Bearing HK 4020 2RS HK40202RS New
NEW REXNORD SL KEYED HUB SHSB 1-3/8"-STL 73C0325 1-3/8" BORE
E-Mon D-Mon Power Current Sensor 1600A 1600 A Amp Used
NEW TIMKEN T157W TAPERED ROLLER THRUST BEARING
NEW SKF 6314-2RS1/C3HT51 RUBBER SHIELD BALL BEARING
Binks 106-1075 Spare Parts Kit (D F 1061075 New
NEW BOWER CS 5704 EM BEARING CS5704EM BCA 205F SEAL
10 Fafnir CB14A-6 roller conveyor Bearing hexagon id
SNR Double Row Self Aligning Ball Bearing 1320 K 1320K New
NEW FAFNIR 320K C1 SINGLE ROW BALL BEARING 8E 320KC1 320K
LOT OF 2 SQUARE D PULL ROLL OPEN LEGEND PLATES 9001 KN-300 NEW 9001KN-300
LOT OF 2 NO NAME MACHINE IN LEGEND PLATE ALUMINIUM W/OFF SET NEW
lot of 2 SQUARE D conveyor jog LEGEND PLATE ALUMINUM 9001 KN-300 9001KN-300 NEW
NEW MRC THRUST ROLLER BEARING 7412 7412 DU 7412DU 1/2 ABEC
2 NEW NO NAME TEXTILE GEARS TY39 APPROX. 1.177" ID
DODGE ROLLER BEARING BRG22222K 22222EAS KM C3 22222EASKMC3 NIB
NEW ASKUBAL ROD END BEARING KAL 25 KAL25 Left Hand Thread M24-2.0 25mm ID
NEW F.K BEARINGS S/S SS 3/4"x3/4" 2 PIECE STAINLESS STEEL W/TEFLON LINER SCF12T
Agastat Time Delay Relay 7012AK 120V Coil 1-300 Seconds New
NEW MCGILL C-25-1 1/8 PILLOW BLOCK BEARING MB-25-1 1/8
NEW PTI PILLOW BLK BEARING INA GE35KRRB GE 35 KRRB HFH AS2/V V05 SWG35
NEW LOT OF 2 KOYO/ RAYMOND M88010-9 M88010 HI-CAP BEARING RACE CUP 447544
SKF BEARING 5204 A-2RS/C3 5204A2RSC3 NIB
NEW BOWER BEARING MU 1217 MU1217 M 1217 U M1217U
Koyo Rubber Sealed Radial Ball Bearing 62132RDTC3 6213RDT New
NEW SKF BEARING 4212 ATN9 4212ATN9
NEW SKF BEARING 2207 EKTN9 2207EKTN9
PACIFIC BEARING LINEAR BEARING HVB-054 HVB054 NIB
NEW MRC 111KR TRUST BEARING 111-KR
NEW SKF BEARING 7201 ACD/P4ADGC 7201ACDP4ADGC 7201ACD/P4ADGC (1/2) SET
Hub City Ball Bearing Insert 1 7/16" 36x71x34mm New
NEW FAFNIR SUPER PRECISION BEARING MM9316WI-3 MM9316WI3
SKF Single Groove Radial Ball Bearing 6012-RS2/C3VK255 6012-RS2/C3DPS New
NEW RBC CAM FOLLOWER BEARING H64LW
SKF Ball Bearing 6011 2RSJ EM 60112RSJEM 6011 C3 55MM ID 90MM OD 18MM WIDTH NEW
SealMaster Ball Bearing Cartridge Unit SC-210 SC210 50mm Bore New
NEW JAF DOUBLE ROLLING BALL BEARING MRC 5207 K MRC5207K
LEGRIS 1025U10 00 10MM O.D. 7MM I.D. 75' POLYETHER POLYURETHANE TUBING NIB
Link Belt 4-Bolt Circular Round Flange Bearing FC4-U232NC FC4U232NC 2" Bore New
MB 2-Bolt Flange Bearing KC551-1516 KC5511516 KC55 1-15/16" Bore New
Fafnir Two Bolt Pillow Block LAK 1 15/16 SM1115K G1115KLLB New
SKF Angular Contact Precision Bearing 7206 CDGA/P4A 7206CDGAP4A New
TIMKEN TAPER ROLLER BEARING BORE (I.D.) 127mm HH228349
NEW LINK-BELT 2 BOLT FLANGE BEARING FX3U223N 1-7/16"
No Name 40 42-2 Sprocket 40422 2-3/32" Bore New
NO NAME 4NU24W62 A1-54 ROLLER BEARING NEW
NEW KETCHIE- HOUSTON KH-1348-2A PILLOW BLOCK BEARING W/COLLAR 1115 1115 RR
Fafnir Ball Bearing Open Double Row Filing Slot Type 5207 W C1 5207W New
Fafnir Torrington Single Groove Radial Ball Bearing 210KD 210KD C1 New
SNR Single Groove Radial Roller Ball Bearing 6013 J30 6013J30 New
New Departure Single Row Radial Ball Bearing H20211DT55311 20211 New
Fafnir Ball Bearing with Collar 1107KRR+COL 1107KRRCOL New
NEW COOPER 2 BOLT PILLOW BLOCK BEARING 01BCP203EX
RBC Extra Large Cam Follower Bearing H 160 LW H160LW New
NEW SKF EXPLORER BEARING 60092RSJEM 6009-2RS1/C3GJN
NEW MAREL OPEN PLASTIC FLANGE BEARING 732-3100-400 7323100400
NEW INA INSERT BEARING WITH COLLAR & FLANGED HOUSING GRAE 60 NPPB GRAE60NPPB
NEW CONSOLIDATED BALL BEARING 3306B2RSRTNG.C3 3306B2RSRTNGC3
NEW BCA BOWER FEDERAL MOGUL BALL BEARING 5204-KE 5204KE
NEW TIMKEN 533-D 533D 533 D #2 TAPERED ROLLER BEARING RACE
NEW AURORA GREASED ROD END HEIM JOINT MW-7 7/16-20 RH RIGHT HAND THREADS 7/16"ID
HOERBIGER ORIGA P126-S/22X54-BM 22" STROKE AIR PNEUMATIC RODLESS CYLINDER
NEW (288TIPS) NO NAME STERILE BARRIER PIPET TIP 7503-96R-200F 750396R200GF 200UL
(2) SKF Rubber Sealed Ball Bearing 6002 2RSJEM 60022RSJEM 6002-2RSH/C3GJN New
SNR Cylindrical Roller Bearing NU.211.E.G15 NU211EG15 NU211E F25 New
14 Boston Gear SC81 Steel Shaft Collar SC 81 13/16"ID 1-9/32"OD 9/16"Thick
SKF Shielded Roller Ball Bearing 305707 C-2Z 305707C2Z New
NEW INA CF 48 CAMFOLLOWER CF-48 ART.014011-2 02/V8
NSK Single Groove Ball Bearing 6318C3E 6318C3 New
NEW SKF 7208 ACD/P4ADGB Precision Bearing 7208ACDP4ADGB
KOYO Single Row Ball Bearing 6311C3 New in Box
Consolidated Needle Bearing w. Inner Race RNAK-NAK45 NAK45 New
SealMaster Ball Bearing Cartridge Unit MSC-31T MSC31T 1 15/16" Bore New
Sealmaster Seal Master 2 Bolt Flange Bearing SFT-17 SFT17 1 1/16 1-1/16" New
Nachi Rubber Sealed Ball Bearing 6216-2NSL 62162NSL 6216NSL New in Box
New Aetna Roller Bearing A-75221 65221-E ISD 4.130 OSD 7.4650
NEW SST HCP211-35 PILLOW BLK BEARING HC211-35 2-3/16"
BCA Ball Bearing Insert WPC 108-TPC WPC108TPC W108 1 1/2" Bore New
BOWMAN HOLLIS BELT BELTING LENGTH: 4380 mm x WIDTH: 160 mm x THICKNESS: 1.0 mm
NEW REXNORD STEEL KEYED HUB SHSB 1-7/8" 1/2"x 1/4" keyway 7300335 1-7/8" bore
DODGE ROLLER BEARING CARTRIDGE UNIT 127035 2-15/16" INCH
SKF 122R 6210-2Z7C3H151 62102Z7C3H151 BEARING NEW
WESTINGHOUSE BREAKER HMCP050K2 B SER C 50A 50 A AMP 600Vac 250Vdc 3 POLE
SEAL MASTER SEALMASTER PILLOW BLOCK BEARING EMP35T EMP 35 T 2 3/16" SIZE NIB
SKF Sealed Ball Bearing 61908 2RS1/C3HT51 619082RS1 619082RS1C3HT51 New
NEW SPHERCO ARE-12N HEIM JOINT RH ROD END BEARING / MALE 3/4 x 16 TPI 3/4" BORE
BARDEN BALL SCREW PRECISION BEARING L175HDFTT1500 NEW
NEW KAYDON KF055CP0 0D0 THIN SECTION BALL BEARING KF055CP0 0D0203 0S3Y4
NEW ZKL 6303A-2ZR C3 BEARING 6303A-2ZR CSFR 6303A2ZR
NEW FAFNIR INSERT BEARING GC1010KRRG2
NEW FAFNIR MM9310WI-2 BALL BEARING
NEW BRECO POLYURETHANE TIMING BELT 50T10-1390 50T10/1390 50T101390 2" WIDTH
