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根据PLC梯形图程序扫描原则，按先左后右先上后下的步序，逐句扫描，执行程序。遇到程序跳转指令，根据跳转条件是否满足来决定程序的跳转地址。从用户程序涉及到输入输出状态时，PLC从输入映象寄存器中读出上一阶段采入的对应输入端子状态，从输出映象寄存器读出对应映象寄存器，根据用户程序进行逻辑运算，存入有关器件寄存器中。对每个器件来说，器件映象寄存器中所寄存的内容，会随着程序执行过程而变化。
3．输出处理
程序执行完毕后，将输出映象寄存器，即器件映象寄存器中的Y寄存器的状态，在输出处理阶段转存到输出锁存器，通过隔离电路，驱动功率放大电路，使输出端子向外界输出控制信号，驱动外部负载。
HORBURN N23TWX06-6MPS6-6MPS6-1200 HOSE 1200IN 3/8IN NPT 10000PSI D550276
THORBURN N23TWX06-6MPS6-6MPS6 90FT 10000PSI HYDRAULIC HOSE D550277
EATON FC273-20 AEROQUIP JIC-20 8FT 1-1/4 IN 5000PSI HYDRAULIC HOSE D564690
CAT 197-4027 1974027 JIC -16 103 IN 5004PSI HYDRAULIC HOSE D563340
MANULI R2AT-8 TRACTOR/2T MALE / FEMALE 50FT 3980PSI HYDRAULIC HOSE D585876
HOWDEN EN 853-2SN 20 1IN 50FT 215BAR HYDRAULIC HOSE D585882
CATERPILLAR CAT XT-3ES JIC -10 18FT 1/2 IN 4000PSI HYDRAULIC HOSE D562753
TRC 639148-4 AEROQUIP 2580/M 24136/3-24-3Q07-3E6R6 7FT JIC-24 HOSE D566638
CATERPILLAR CAT 239-4993 2394993 JIC -16 36IN 4000PSI HYDRAULIC HOSE D562756
PARKER 3AK43 ITR SSH4 8FT 1-1/4 IN 5000PSI HYDRAULIC HOSE D554900
THORBURN N16C2AEH-M2-16FJXS6-16FJXS6-120 10FT JIC-16 HYDRAULIC HOSE D552501
KOMATSU 58B-60-20500 JIC -20 4FT 2300PSI HYDRAULIC HOSE D563336
KOMATSU HA8061 JIC -20 5FT 2300PSI HYDRAULIC HOSE D562761
CATERPILLAR CAT 3135128 JIC-10 XT-3ES 9FT 1/2 IN HYDRAULIC HOSE D562748
KOMATSU HA8058 JIC -20 4FT 925PSI HYDRAULIC HOSE D563333
HYDROSCAND 1015-00-24 DELTAFLEX HYDRAULIC HOSE 1-1/2IN 4FT 26MPA D587573
PARKER 422/421-20 1.25IN 41-43IN 900PSI HYDRAULIC HOSE D584212
HYDROSCAND 1015-00-24 DELTAFLEX 1.5IN 3FT HYDRAULIC HOSE D587128
INGERSOLL RAND 39573100 42IN X 1-1/8IN HYDRAULIC HOSE D584259
NRP JONES A150 SAE100R16 HYDRALITE II 10FT 3/8 IN 4500PSI HYDRAULIC HOSE D547432
ITR R9/R 2LZ43 JIC-8 8FT 5/8 IN 390BAR HYDRAULIC HOSE D564678
PARKER 421-20 NO-SKIVE 40IN X 1IN HYDRAULIC HOSE D584197
PARKER 5620N-6 PARFLEX 3/8 X 96IN HYDRAULIC HOSE 4000PSI 3/8IN NPT D597004
PARKER HA5698 722LT-8 JIC -8 21 IN 1/2 IN 4000PSI HYDRAULIC HOSE D562744
TRC A6022-16MPFJCS-24.5 24-1/2 IN JIC-16 1200PSI HYDRAULIC HOSE D552298
INGERSOLL RAND 39589528 24IN X 3/4IN HYDRAULIC HOSE D584191
AEROQUIP GH781-4 MATCHMATE GLOBAL HYDRAULIC HOSE 1/4IN 24IN 6500PSI D595271
PARKER 5620N-6 PARFLEX 3/8 X 48IN HYDRAULIC HOSE 4000PSI 3/8IN NPT D597007
TRC A6022-16MPFJCS-21 21 IN JIC-16 1200PSI HYDRAULIC HOSE D552299
AEROQUIP MATCHMATE PLUS 1/2INX20IN HYDRAULIC HOSE 1/2IN NPT 4250PSI D585248
TRC A6022-16MPFJCS-12.75 12-3/4 IN JIC-16 1200PSI HYDRAULIC HOSE D552514
AEROQUIP GH781-16 MATCHMATE GLOBAL 2-1/2FT 1 IN NPT HYDRAULIC HOSE D559103
MANULI EN855 HYDROPLAST DN 06 34 IN 1/4 IN 2780PSI HYDRAULIC HOSE D527396
NRP JONES A150 SAE100R16 HYDRALITE II 18 IN X 3/8 IN HYDRAULIC HOSE D547380
1/4 IN SAE 100R1AT/1SN 3250PSI HYDRAULIC HOSE D557201
RYCO T26A AVENGER 18 IN 3/8 IN NPT 5100PSI HYDRAULIC HOSE D527076
SYNFLEX 3000-04 HYDRAULIC HOSE 3000PSI 26IN 1/4IN SAE 100R7 D558895
ALFAGOMMA T-202 3/4IN X 17IN HYDRAULIC HOSE 150PSI 1IN NPT D584257
PARKER 5620N-6 PARFLEX 3/8 X 28IN HYDRAULIC HOSE 4000PSI 3/8IN NPT D597011
GATES 4TH7 9FT 1/4 IN 2750PSI HYDRAULIC HOSE -4 JIC D528522
DUSTERLOH FLUIDTECHNIK RM900Z 900CC/REV RADIAL PISTON HYDRAULIC MOTOR D516975
EATON SBD16DA2-C CHAR-LYNN HYDRAULIC MOTOR D593089
EATON 2-080MB6C-E SEHYCO HYDRAULIC MOTOR D591242
DAIKIN TM19BI-2R23-PT6K-10-159 HYDRAULIC POSITIONING MOTOR 21LPM D586718
VICKERS 25M55A 11C20 313459-3 HYDRAULIC VANE MOTOR D568535
PARKER 115A-129-AS0S-V IGR HYDRAULIC MOTOR D579793
EATON 104-1382-006 CHAR-LYNN HYDRAULIC MOTOR 306.6CM3/R D587839
HOUDAILLE LSB 410223 HYDRAULIC MOTOR D596813
MRYC-Z15-2V-90 TORQUE ACTUATOR HYDRAULIC MOTOR D593459
SUNSOURCE-FAUVER 313-9710-302 1214225952 HYDRAULIC GEAR MOTOR D594389
EATON 103-1019-012 CHAR-LYNN HYDRAULIC MOTOR D571259
PARKER 113A-129-AS-0 HYDRAULIC MOTOR D571406
PARKER TC0036AS100AAAB TC SERIES HYDRAULIC MOTOR 9GPM 5.6HP D594025
CHAR-LYNN 106-1015-006 2000 SERIES BEARINGLESS DISC VALVE MOTOR D568772
NIPPON OIL PUMP ORB-S-050-2PM ORBMARK HYDRAULIC MOTOR 25MM SHAFT D596389
EATON 104-1382-006 CHAR-LYNN HYDRAULIC MOTOR 306.6CM3/R D588172
SUNSOURCE-FAUVER 313-9710-302 1214225950 HYDRAULIC GEAR MOTOR D584158
GEARTEK 720894 HYDRAULIC MOTOR D577808
GEARTEK D SERIES HYDRAULIC MOTOR D593603
KELLER-HYDRAULIK MPH160/22.5 HYDRAULIC MOTOR 20LPM D595883
PARKER TC0036AS100AAAB TC SERIES HYDRAULIC MOTOR 9GPM 5.6HP D592643
EATON 146-2872-002 CHAR-LYNN GENERAL PURPOSE HYDRAULIC MOTOR 15GPM D588897
EATON H-390BB2MXJ CHAR-LYNN HYDRAULIC MOTOR D586132
YUKEN A145-FR01KS-60950 VARIABLE DISPLACEMENT PUMP 28MPA 145CM3/REV D593583
REXROTH AA4VG40HWDM1/32R-NSC52F006D HYDRAULIC PISTON PUMP D585751
CATERPILLAR CAT 10R-1724 AXIAL DISPLACEMENT DOUBLE STAGE HYDRAULIC PUMP D493880
REXROTH R902502701/000 AA10VSO71DR/31R VARIABLE DISPLACEMENT PUMP D568880
VICKERS F11-SQP4-60-86CR18 HYDRAULIC FIXED DISPLACEMENT VANE PUMP D596861
BRUENINGHAUS A10VSO45DFR/30L-PPA12N00 VARIABLE DISPLACEMENT PUMP D574087
TOKIMEC F11-SQP4-60-86D-LH-18 HYDRAULIC FIXED DISPLACEMENT VANE PUMP D593748
DANFOSS 163Y1051 STAINLESS HYDRAULIC PUMP D591330
GRACO 222796 E03A DURA-FLO 1800 DISPLACEMENT PUMP 4500PSI 26.1LPM D588089
IMO AA3G/NVPSCA118SC HYDRAULIC SCREW PUMP D591635
KOSHIN SEIKOSHO PSV-PSS0-20ERL-V SILENT VANE HYDRAULIC PUMP D596950
NACHI VDR-11B-1A2-1A2-U-22 30LPM VARIABLE VANE HYDRAULIC PUMP D593018
HPI P1AAN2010UL20A08N GEAR HYDRAULIC PUMP D588750
NACHI W-PZS-5B-130N3-10 PISTON HYDRAULIC PUMP 3.11-7.93IN3/REV D591380
DUPLOMATIC PVA72MQ/30 VARIABLE DISPLACEMENT HYDRAULIC VANE PUMP D585014
NACHI VDR-11B-1A2-1A2-22 VARIABLE VANE HYDRAULIC PUMP 30GPM D593000
NACHI W-IPH-55B-64-64-11 ECKERLE HYDRAULIC GEAR PUMP D593826
HOTSY H306R.2 TRIPLE STAGE HYDRAULIC PLUNGER PUMP 1200RPM 4GPM D596319
REXROTH 1PV2V4-27/ 80RW16VC160 VARIABLE VOLUME HYDRAULIC PUMP D574176
EATON V2010 1F7S5S 1AB12 7GPM VANE HYDRAULIC PUMP D596790
SEIM PA040-4A0M EU40A-100 HYDRAULIC SCREW PUMP 2.6-224GPM D585948
IMO 3241/505 C3EX118D505 HYDRAULIC SCREW PUMP D559542
HPI P1AAN1001CL20C01N HYDRAULIC GEAR PUMP D592071
DUPLOMATIC PVA72MQ/30 VARIABLE DISPLACEMENT HYDRAULIC VANE PUMP D585343
VICKERS PVM131ER13GS02AAA0700000EA HYDRAULIC PISTON DISPLACEMENT PUMP D589824
HOWARD MARTEN PU05003 SINGLE STAGE HYDRAULIC SCREW PUMP D559370
NACHI IPH-6B-80-11 ECKERLE 30MPA 2000RPM GEAR HYDRAULIC PUMP D591909
COLFAX 3241/281 C3EHF-118P HYDRAULIC SCREW PUMP D596315
COLFAX 3251/380 D3EHFS-118 3E SERIES HYDRAULIC SCREW PUMP D583715
VICKERS 35V25A 1B22A SINGLE STAGE VANE HYDRAULIC PUMP D546913
VICKERS EATON V10-1S6S-1D20 HYDRAULIC VANE PUMP D574277
LYNCH MB-1685-3 HYDRAULIC GEAR PUMP 1IN NPT D592964
COMMERCIAL SHEARING M51A898BE0L20-7 HYDRAULIC GEAR PUMP D592968
CAT PUMPS 3CP1120 TRIPLE STAGE PLUNGER HYDRAULIC PUMP 4.2GPM D594395
VICKERS 25V14AF 1A22R HYDRAULIC VANE PUMP D570652
GEROTOR H8-P-10B1 DOUBLE A HYDRAULIC PUMP 1IN NPT D584774
PARKER H39AA1B HYDRAULIC GEAR PUMP D587150
COMMERCIAL INTERTECH P25XSPLIT17-30 HYDRAULIC PUMP D582978
VIKING SG-051010-G0 HYDRAULIC DOUBLE PUMP D585215
BRAN LUEBBE BL0634 PLUNGER PUMPHEAD 1/2IN TUBE D596651
IMO 3240/011 HYDRAULIC SCREW PUMP D596351
VICKERS 25V21A 1C22R EATON HYDRAULIC SINGLE STAGE VANE PUMP D572609
GEBR STEIMEL GMBH B2-24RKD OIL PUMP 1/2IN NPT D568667
PARKER PVP16X3946/12 VARIABLE VOLUME PISTON PUMP 3000PSI 1800RPM 2GPM D589007
NACHI PVS-2B-35N1-N-12 HYDRAULIC PISTON PUMP D586924
BORG WARNER G30S13DS53B HYDRAULIC GEAR PUMP D590968
VICKERS V20F 1S13S3A6H22L VANE HYDRAULIC PUMP 6GPM D583414
NACHI VDC-2A-2A3-20 VARIABLE 70LPM VANE HYDRAULIC PUMP D591841
VICKERS 2884865 HYDRAULIC VANE PUMP 1/2IN NPT D594409
RICKMEIER R35/63 FL-Z-DB-SO HYDRAULIC GEAR PUMP D550030
BORG WARNER MC30S29DJ72B HYDRAULIC GEAR PUMP D583060
LUBE-POWER 1KH1N13L GEAR PUMP .61GPM D591493
DOWTY OP 3006 CPSJB INTERNAL GEAR PUMP D591601
ALLIS CHALMERS 71-340-148-00-2 GC-1038 GC688B HYDRAULIC GEAR PUMP D559505
PARKER 330 9112 266 3/8 X 1/4 IN NPT STAINLESS HYDRAULIC GEAR PUMP D544403
JOHN S BARNES GC-1468-A-11-C HYDRAULIC GEAR PUMP D559964
JOHN S BARNES GC-1468-A-2-C HYDRAULIC GEAR PUMP D559965
MOOG G761-3600 HYDRAULIC SERVO VALVE D594108
MOOG S22FOFA4VBL 072-558A HYDRAULIC SERVO VALVE D583913
MOOG S22FOFA4VBL 072-558A SERVO HYDRAULIC VALVE D583999
BOSCH 4WRLE10V85M-3X/G24ETK0/A1M 4WRPEH6C3B04P-20/G/24K0-A1M SERVO VALVE D517242
MOOG S15FOFM4VBL-072F132 ELECTRO-HYDRAULIC SERVO VALVE D554035
MOOG S22FOFB4VBL-072F714 ELECTRO-HYDRAULIC SERVO VALVE D554038
MOOG S15FOFM4VBL-072F132 ELECTRO-HYDRAULIC SERVO VALVE D554033
