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設(shè)計(jì)思路本文提出的4種簡(jiǎn)易設(shè)計(jì)方法都是先設(shè)計(jì)步進(jìn)階梯，在步進(jìn)階梯實(shí)現(xiàn)由轉(zhuǎn)步主令信號(hào)控制輔助繼電器得失電；然后根據(jù)步進(jìn)階梯設(shè)計(jì)輸出階梯，在輸出階梯實(shí)現(xiàn)由輔助繼電器控制輸出繼電器得失電。這4種設(shè)計(jì)法所設(shè)計(jì)的梯形圖電路結(jié)構(gòu)及相應(yīng)的指令應(yīng)適用于大多數(shù)PLC機(jī)型，具有通用性。
由于各種PLC機(jī)型的編程元件代號(hào)及其編號(hào)不盡相同，為便于闡述，本文約定：所有梯形圖中的輸入繼電器、輸出繼電器、輔助繼電器（又稱(chēng)內(nèi)部繼電器）的代號(hào)分別為：X、Y、M。設(shè)計(jì)中所用到的某些功能指令，如置位指令約定為S×，復(fù)位指令為R×；移位指指令為SR×。其中的“×”表示編程元件的編號(hào)，用十進(jìn)制數(shù)表示。用這些方法設(shè)計(jì)實(shí)際的控制系統(tǒng)時(shí)，應(yīng)將編程元件代號(hào)和編號(hào)變換成所選用的PLC機(jī)型對(duì)應(yīng)的代號(hào)和編號(hào)。
【誠(chéng)信經(jīng)營(yíng)】【質(zhì)量可靠】【進(jìn)口原裝】【拆包防偽】
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C.W. BRABENDER INSTRUMENTS INC. 60-CYCLE 1PH 115V 5A VISCO/AMYLO/GRA?PH TYPE VA/V
DWYER VFB SERIES FISI-FLOAT FLOWMETER
TELEMECANIQUE LIMIT SWITCH, XCK-J...H7
SMC AUTO SWITCH SENSOR D-F7PW
E-MON CORP. 200A 277/480 4 WIRE KILOWATTHOUR METER 480200
WESTCODE THYRISTOR MODULE BISCR 15001850 0143
PFA SELF LOCKING CYLINDER PVS-4.0/1.375X6?.25-1-MF1-SF-C0?2 NNB
ADAPTALIGHT STACKABLE BEACON 101SINHA-N5 NIB
ECLIPSE BUTTERFLY VALVE 501235 10BV-ARB 2.5 NPT NNB
BURNDY CONNECTOR DIE MODEL YA-2N NNB
GPS THYRISTOR MODULE DCR1004SF 1717 9602
BUSS FUSEHOLDERS 12A LINE NIB LOT OF 11
HOYT LOAD CONTROLS INC. 0- LOAD METER, G-8504
BUSS FUSE HOLDER J60100-3CR NNB
WIKA * PRESSURE GAUGE * 0-100
ALLEN BRADLEY CONTACTOR MOTOR 702L-BOD92 SER. K
FLUKE DIGITAL I/O BOARD 642546 REV. E
BRAD HARRISON 8P FEMALE STRAIGHT 20" 16/8 AWG PVC CORD 208000A01F200 NIB
TRANSMATION INC. 117VAC PPS DIGITAL CALIBRATOR 1040 SER-1040
AIR MONITOR CORPORATION MASS-tron II MASS FLOW TRANSMITTER W31302
FAIRCHILD EA-13367-1 REPAIR KIT, NIB
APPLETON UNILET 1"C FORM 35 NNB
MAC SOLENOID VALVE 35A-B00-DDFJ-1T?J NIB
MIDDLEX ELECTRONICS TOOL CONTROL POWER SUPPLY MODULE D-78582 TYP PS1A
BRAD HARRISON * 5P FEMALE CORD * 206001A02F120
BROOKS MT 3810 VARIABLE AREA FLOWMETER TRANSMITTER 3810A13C1RAA1A1
AMPHENOL CIRCULAR CONNECTOR PTO2E-14-19P , 1073/21 V 22A
FESTO SILENCER U-1-B NNB
BUSS FUSE HOLDER H60060-3CR NNB
MURR ELEKTRONIK 27859 4 WAY DISTRIBUTION BOX,NNB
TELEDYNE ANALYTICAL INSTRUMENTS AIR PURITY METER REV.O 275R / Q000092
JOSLYN CLARK 500VDC 75A DC DRIVE CONTACTOR, 5DP7-5150-11, NNB
BURNDY YA34-2N 2 HOLE CRIMP LUG 500KCM NNB
EUCHNER 110VAC/VDC SAFETY SWITCH,TZ2RE110?PG
GLOBESTRUT 2 HOLE ADJUSTABLE CORNER ANGLE LOT OF 15 NIB
PHOENIX CONTACT 1678826 CABLE USED
MCLEAN THERMAL PAPST 115V .22A 1 PHASE FILTER FAN, SF-0516-002
AMP 2-87631-0 FEMALE SOCKET CONNECTORS 0625 LOT OF 104
EA ELEKTRO-AUTOMAT?IK Gmbtt, EA-PS-9040-070 REV.B NNB
GROSSENBACHER OUTPUT CARD CIRCUIT BOARD, 38225-07-12-60
MICRO SWITCH LSYFC1ADD NNB
KYTOLA FLOW METER EK-5704
GRACO TRABON 24VDC SOLENOID COIL, 557225/H12, NIB
MERCOID CONTROL DA21-153RG-13S PRESSURE SWITCH, NIB
SEMIKRON MODULE SKKT 91/12 D
SQUARE D * 100A 600V SER E1 SAFETY SWITCH * H363AWK
MICROSWITCH PTW5211
SICHERUNG CIRCUIT BOARD
DELTA ELECTRONICS FONSAN 12V 0.3A BRUSHLESS DC FAN DFB0912H
SICK ASSEMBLY MODEL 7021817
MINISAFE-B LIGHT CURTAIN RECEIVER CONTROLLER MS4424B
SCHUBERT PENDANT STATION BBOX F2/VMS 2000
FANUC TRACE PROTECTOR A50B-2301-D020 NNB
OMRON LY2 RELAY, NNB
KEYENCE CCD CV-020
SEW-EURODRIVE INC. K37DT80N4 GEAR MOTOR, NO BOX
MARTIN QD BUSHING SH1 NIB
HELICOID GAGE 0-30 PRESSURE GAUGE 2218-0
FANUC POWER CABLE CP9I-OMPB-0150-?AAA, SEALED
FEDERAL DIGITAL ELECTRONIC INDICATOR 1511D NIB SEALED
MAC SOLENOID BASE
ALLEN BRADLEY POWER SUPPLY SERIES B 1775-PL NIB
BURKERT PNEUMATIC SOLENOID VALVE 0331 C 5/32 FPM NNB
SCHROEDER INDUSTRIES KZ3 FILTER ELEMENT NIB
HONEYWELL 120V 50/60HZ 160 DEG STROKE MODUTROL IV MOTOR, M7285A1011
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