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編程規則與典型程序塊
    利用梯形圖編程與采用繼電器控制電路有些相似，因此，很多人習慣采用梯形圖編程。梯形圖編程有些基本要求和規則，也有一些規律可循。
    2.1梯形圖設計的基本原則
    PLC編程應注意以下基本原則。
    （1）外部輸入/輸出繼電器、內部繼電器、定時器、計數器等軟元件的觸點可重復使用，沒有必要特意采用復雜程序結構來減少觸點的使用次數。
    （2）梯形圖每一行都是從左母線開始，線圈接在zui右邊。在繼電器控制原理圖中，繼電器的觸點可以放在線圈的右邊，但在梯形圖中觸點不允許放在線圈的右邊。如圖6-10所示。

（3）線圈不能直接與左母線相連，也就是說線圈輸出作為邏輯結果必須有條件。必要時可以使用一個內部繼電器的動斷觸點或內部特殊繼電器來實現。參見圖6-11所示。

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鄭娟萍

廈門仲鑫航自動化設備有限公司

（4）同一編號的線圈在一個程序中使用兩次以上稱為雙線圈輸出。雙線圈輸出容易引起誤操作，這時前面的輸出無效，只有zui后的輸出才有效。但該輸出線圈對應觸點的動作，要根據該邏輯運算之前的輸出狀態來判斷。如圖6-12所示，由于M1雙線圈輸出，所以，M1輸出隨zui后一個M1輸出變化，Y1隨*個M1線圈變化，而Y2隨第二個M1輸出變化。所以，一般情況下，應盡可能避免雙線圈輸出。

    （5）梯形圖程序必須符合順序執行的原則，即從左到右，從上到下執行，如不符合順序執行的電路不能直接編程，例如圖6-13所示電路不能直接編程。
    （6）梯形圖中串、并聯的觸點次數沒有限制，可以無限制的使用

ALLEN BRADLEY 800MR-N2W ILLUMINATED WHITE PILOT LIGHT CAP / LENS (SET OF 5) NIP

ALLEN BRADLEY 800T-N40 ILLUMINATED RED EXTENDED HEAD CAP / LENS (SET OF 5) NIP

STEARNS 6-3-41156-09 FACTORY REPLACEMENT COIL 115V  NOS CONDITION NO BOX

VICKERS 20107A FACTORY REPLACEMENT COIL 115 VAC NOS CONDITION NO BOX

ADALET XHPB EXPLOSION PROOF PUSH BUTTON NEW CONDITION IN BOX

JESCO N-2070 DISPENSING VALVE NOS CONDITION / NO BOX

VICKERS 941053 FACTORY REPLACEMENT FILTER ELEMENT KIT NEW CONDITION IN BOX

BRASS SIGHT FLOW INDICATOR 1/2" NPT 125 PSI NEW CONDITION NO BOX

TOSHIBA 30L6P41 POWER MODULE  NEW CONDITION / NO BOX

AURORA PENTAIR AS03-74223 CENTRIFUGAL PUMP TYPE 344A-BF SIZE 2X7B NOS CONDITION

BANNER SBF1 MULTI-BEAM FIBER OPTIC SCANNER BLOCK NEW CONDITION NO BOX 

IDEX / VIKING PUMP K125 POSITIVE DISPLACEMENT PUMP REFURBISHED CONDITION

GORMAN RUPP T6B60-B SELF PRIMING CENTRIFUGAL PUMP ROTATING ASSEMBLY REFURBISHED

EGGER PUMPS CH-2088 SLURRY PUMP ASSEMBLY T41-40S0F2/7.5KW NEW CONDITION IN BOX

ALLEN BRADLEY 1326AB-B515G-21 AC SERVO MOTOR P/N 163332 USED WORKING CONDITION

COEN/MAXON 3" F 5000 S CP CC1 NATURAL GAS SAFETY SHUT OFF VALVE 3" 115V  NEW 

INDUSTRIAL SUPPLY & MRO INVENTORY FOR SALE OVER 20,000 SQ.FT OF INVENTORY

FURNAS 52RA6P2 OIL TIGHT ILLUMINATED SELECTOR SWITCH RED LENS (SET OF 4)  NIP

GRACO 178490 FACTORY REPLACEMENT MUFFLER NEW CONDITION IN PACKAGE

MILLER ELECTRIC 169217 ELECTRODES 70/100A (SET OF 5) NEW CONDITION IN PACKAGE

MICRO SWITCH BZ-3R MICRO SWITCHES 15A 125/250/480V (SET OF 5) NEW NO BOX

FLUID CONTROLS 7W30-2 VALVE CARTRIDGE 115V NEW CONDITION NO BOX

ALLOY STAINLESS PRODUCTS 3/8" STREET ELBOWS 304 STAINLESS (SET OF 5) NEW NO BOX

P/N 25313V  4-WAY PLUG VALVE  8" CLASS 125  NEW CONDITION

UNIVERSAL LIGHTING TECHNOLOGIES 446-L-SLH-TC-P RAPID START BALLAST 120V  NIB

HAYWARD TRUE UNION BALL CHECK VALVE 1/2" NPT NEW CONDITION NO BOX

RS CORCORAN 2000D-SP CLOSE COUPLED SELF PRIMING PUMP 316L SS 3/4HP NEW CONDITION

MCNAUGHTON MCKAY MCMC-CP-DH+ DATA HIGHWAY ENCLOSURE ASSEMBLY NEW NO BOX

MILLER ELECTRIC 137114 GAS/CURRENT SENSOR CONTROL BOX NOS CONDITION NO BOX

GRACO 223-363 PISTON FACTORY PACKING STACK SERVICE/REPAIR KIT NEW IN PACKAGE

FABIO PERINI 8M30 TIMING PULLEY P/N 2825  NEW CONDITION / NO BOX

VERSA ESM-3301-46-CG-M-N-WE-14-A120 SOLENOID VALVE 1/4 NPT 110/120V NEW IN BOX

FABIO PERINI Z39 M3T5 REPLACEMENT GEAR P/N 239086 NEW CONDITION / NO BOX

FABIO PERINI 147626 TIMING PULLEY   NEW CONDITION / NO BOX

FABIO PERINI Z41-M6.5-23M REPLACEMENT GEAR P/N 080364 NEW CONDITION / NO BOX

FABIO PERINI 154544 TIMING PULLEY   NEW CONDITION / NO BOX

FABIO PERINI 455 M4 TIMING PULLEY P/N 145229 NEW CONDITION / NO BOX

FABIO PERINI 89-8M-30 TIMING PULLEY P/N 145935 NEW CONDITION / NO BOX

FABIO PERINI 56-14M-85 TIMING PULLEY P/N 154528 NEW CONDITION / NO BOX

GORMANN RUPP 12C20-B SELF PRIMING CENTRIFUGAL PUMP 2"  NEW CONDITION

VEEDER ROOT 767181 425 PULSE TRANSMITTER 600 RPM .75V USED WORKING CONDITION

SWAGELOK B-L65TF12-LLK BALL VALVE WITH SAFETY LOCKOUT 3/4" NPT NEW CONDITION

SWAGELOK SS-7P8TA8SL8-28 POLY PURE 1/2" HOSE ASSEMBLY MALE TO FEMALE 28"  NEW

GLEASON ID-45604-009-9 HOB GEAR CUTTER 5159700-000  NEW CONDITION IN BOX 

BARBER COLMAN ID7892372-01 ISOFORM SHAPER CUTTER NEW CONDITION NO BOX

PFAUTER MAAG ID59984G3-03 HOB GEAR CUTTER 36187-90 NEW CONDITION / NO BOX 

GLEASON 56930-009-6-00 HOB GEAR CUTTER VA-10458EPT-C  NEW CONDITION / NO BOX 

BARBER COLMAN 5145662-01 HOB GEAR CUTTER 437320-77 NEW CONDITION / NO BOX

BARBER COLMAN 516950-78 HOB GEAR CUTTER 4632577-01 NEW CONDITION / NO BOX

UNION TWIST DRILL 75T4635 HOB GEAR CUTTER 1.25 PITCH 2 THD RH NOS CONDITION 

UNION TWIST DRILL 75T4634 HOB GEAR CUTTER 1.0 PITCH 2 THREADS RH NOS CONDITION 

GLEASON 59195-000-1-00 HOB GEAR CUTTER VA-10459L/3THD MANUFACTURER REGRIND 

GLEASON 35351-009-8-90 HOB GEAR CUTTER VA-10460L USED CONDITION 

PFAUTER MAAG ID-59978-6-3 HOB GEAR CUTTER NEW CONDITION IN PACKAGE 

GLEASON 57655-009-2-01 HOB GEAR CUTTER VA-10434 NEW CONDITION / NO BOX 

GLEASON 59195-000-1-00 HOB GEAR CUTTER VA-10459L/3THD NEW CONDITION NO BOX 

STAR PMM4 TIN 226461 512810 HOB GEAR CUTTER NEW CONDITION IN BOX

GLEASON 38226-009-9-00 HOB GEAR CUTTER VA-10459L NEW CONDITION NO BOX 

GLEASON 57655-009-2-01 HOB GEAR CUTTER VA-10434 FRESH REGRIND 

GLEASON 24091-009-3-03 HOB GEAR CUTTER VA-10458 NEW CONDITION / NO BOX 

VICKERS XT102F30 HYDRAULIC PRESSURE REDUCING VALVE 1-1/4"NPT 2000 PSI   NEW

NORGREN MH12BDA34AGJA PNEUMATIC SOLENOID VALVE 1/8"NPT 120V NEW CONDITION NO BOX

SUMITOMO SFTCM-02W HYDRAULIC THROTTLE CHECK VALVE NOS CONDITION

REXROTH 4WE6D51/AG24NZ45V HYDRAULIC SOLENOID VALVE 24V NOS CONDITION

PARKER FM2BBKN 50 MANAPAK PRESSURE REDUCING VALVE 5000 PSI NOS CONDITION

PARKER CC1225B REMOTE PRESSURE VALVE 1/4" NPT PORTS NEW CONDITION / NO BOX

PARKER PRM2BB06K31X4661 MANAPAK PRESSURE REDUCING VALVE 5000 PSI NOS CONDITION

DOUBLE A NNNBC31M10B2 HYDRAULIC PRESSURE REDUCING VALVE NEW CONDITION NO BOX

DOUBLE A NNYYC310A1 HYDRAULIC FLOW CONTROL VALVE NEW CONDITION NO BOX

NACHI OC-G01-P1-20 HYDRAULIC MODULAR CHECK VALVE NEW CONDITION NO BOX

STAR 512600 PMM4 TIN 267288 3RH CLC HOB GEAR CUTTER NEW CONDITION IN BOX

REXROTH ZDR6DA2-43/75Y/12 SANDWICH PRESSURE REDUCING VALVE P/N 00430193  NEW

SCHNEIDER ELECTRIC TSX MBPCE 030 MODBUS + CABLE 3M NEW CONDITION IN PACKAGE

BRAD HARRISON BTY814P-FBP-003 ACTUATOR/SENSOR MPIS CONNECTOR USED CONDITION

REXROTH ZDR6DB2-43/75YM/12 SANDWICH PRESSURE REDUCING VALVE P/N R900447403  NEW

PARKER H2265BGA23166B SOLENOID VALVE / PS4138166P REGULATOR ASSEMBLY NEW NO BOX

CUTLER HAMMER C0050E2AFB INDUSTRIAL CONTROL TRANSFORMER 50VA NEW NO BOX

DAYTON 2L378G PREMIUM V BELTS 2L378 (SET OF 2) 3VX265 NEW CONDITION IN PACKAGE

NAPA / GATES 3VX850 V BELTS 3/8 X 85" (SET OF 2) NEW CONDITION IN PACKAGE

TW-318-146-013 SPUR GEAR SPLINED BORE 49 TEETH 6-5/16 OD NOS CONDITION

HASKEL 27369 SERVICE / REPAIR SEAL KIT  NEW CONDITION / NO BOX

MORSE 144692 CHAIN CONNECTING LINK 80H-2 (SET OF 2) NEW IN PACKAGE

ALLEN BRADLEY 800E-2DL5 FULL VOLTAGE MODULE WITH LATCH 800E2DL5 NEW IN PACKAGE

ALLEN BRADLEY 800E-3DL3 FULL VOLTAGE MODULE WITH LATCH 800E3DL3 NEW IN PACKAGE

LUCENT TECHNOLOGIES 103801247 CONNECTOR BLOCK 110C-4 (SET OF 20) NEW IN PACKAGE

NATIONAL OIL SEALS J 1112 WEAR SLEEVE / BUSHING (SET OF 2) NEW CONDITION IN BOX

PARKER PSK-LTR151V ROTARY ACTUATOR SERVICE / REPAIR KIT NEW IN PACKAGE

VIKING PUMP / IDEX MODEL LL724 PUMP   USED CONDITION

SIEMENS 1FT5066-1AC71-4FA0 SERVO MOTOR P/N EK985 197001 004 USED CONDITION

CASHCO 1000HP PRESSURE REDUCING REGULATOR 250-300 PSI 3/4" NPT RECONDITIONED

CASHCO 1000HP PRESSURE REDUCING REGULATOR 200-300 PSI 3/4" NPT RECONDITIONED

CASHCO 1000HP PRESSURE REDUCING REGULATOR 150-300 PSI 1/2"NPT RECONDITIONED

SPEARS 2332-025 PVC BALL VALVE TRUE UNION SOCKET 2-1/2" NEW CONDITION IN BOX

COLONIAL C17285 UNION 1 1/2"  THREADED PVC VITON (SET OF 3) NEW NO BOX

ARO / INGERSOLL RAND 95257-4 OEM REPLACEMENT SEALS (SET OF 5) NEW IN PACKAGE

ARO / INGERSOLL RAND 95325 OEM REPLACEMENT SEALS (SET OF 3) NEW IN PACKAGE

SPEARS 2222-040 PVC BALL CHECK VALVE 4" INCH TRUE UNION SOCKET NEW NO BOX

SPEARS 2222-040 PVC BALL CHECK VALVE 4 INCH TRUE UNION SOCKET 4" NEW IN BOX

SPEARS 2332-040 PVC BALL VALVE 4 INCH TRUE UNION SOCKET 4" NEW CONDITION NO BOX

HARTING FEMALE INSERT CONNECTOR NEW CONDITION IN BOX

EMECANIQUE XCKJ5954F0-547 INTERLOCK SAFETY SWITCH NEW CONDITION NO BOX

EMECANIQUE XCKJ5956F0-547 INTERLOCK SAFETY SWITCH 240V 3A  NEW NO BOX

IMPACTO 501-00 PALM PROTECTIVE GLOVES SIZE X-LARGE LEFT & RIGHT HAND NIP

TREGASKISS TOUGH GUN ROBOTIC MIG GUN .052/1.3MM  NEW CONDITION / NO BOX

CROUSE HINDS 470 WEDGE LOCK 1-1/4" STEEL CONDUIT COVER (SET OF 6) NEW NO BOX

CROUSE HINDS 570 WEDGE LOCK 1-1/2" STEEL CONDUIT COVER (SET OF 3) NEW NO BOX

CROUSE HINDS 570SG SNAP LOCK 1-1/2" GASKETED CONDUIT COVER (SET OF 3) NEW NO BOX

CROUSE HINDS 670SG SNAP LOCK 2" GASKETED CONDUIT COVERS (SET OF 3) NEW NO BOX

THOMAS & BETTS / STEEL CITY RC-1 GALVANIZED CLAMPS 1" PIPE/CONDUIT (SET OF 10)

THOMAS & BETTS / STEEL CITY RC-1 GALVANIZED CLAMPS 1" PIPE/CONDUIT NEW BOX OF 50

GATES MICRO-V 340J BELTS 16 RIB 864MM (SET OF 2) NEW CONDITION / NO BOX

GATES MICRO-V 400J BELTS 10 RIB 1016MM (SET OF 2) NEW CONDITION / NO BOX

MAPAL MN 5821-28-K THERMAL EXPANDING CHUCK 21705IZ NEW CONDITION IN PACKAGE

FANUC MODEL 5S AC SERVO MOTOR P/N A06B-0314-B064 REMANUFACTURED CONDITION

STEARNS 5 CFCB CLUTCH-BRAKE ASSEMBLY P/N 2-13-4231-00LJ NEW CONDITION NO BOX

ALLEN BRADLEY 1326AB-B515G-21 AC SERVO MOTOR P/N 163332 NOS CONDITION

BROWNING 3X775 SINGLE GROOVE PULLEY 3/4" BORE NEW CONDITION IN BOX

ORSCO CTD-5825SCE-12A COIL AIR HOSE WITH OETIKER SWING COUPLING 20' NEW NO BOX

JACKES EVANS B2P2 GENERAL PURPOSE SOLENOID VALVE110/120V 1/4" NPT NEW NO BOX

CLARK CH80-7372 RECTIFIER  NEW CONDITION IN PACKAGE

FANUC A06B-0314-B005-R AC SERVO MOTOR REMANUFACTURED CONDITION

FANUC A06B-0127-B176 SERVO MOTOR MODEL A6/2000  REFURBISHED NEW CONDITION

PACIFIC SCIENTIFIC E31NCHT-LEN-PD-01 STEP MOTOR 1.8 35V 1500 RPM NEW NO BOX

ALLEN BRADLEY 845H-SJDZ14CRY1C INCREMENTAL ENCODER 5V DC NEW CONDITION NO BOX

PARKER SKINNER 71315SN2MNJ1 SOLENOID VALVE 1/4" NPT 90 PSI NEW CONDITION IN BOX

SKINNER VALVES V53ADR2100 SOLENOID VALVE MANUAL SHUTOFF 120V 1/4" NPT  NNB 

HYDAC VM5C.0 CLOGGING INDICATOR SWITCH 230V NEW CONDITION NO BOX

PARKER CC1025B 1/4" REMOTE PRESSURE VALVE NEW CONDITION IN BOX

ROSS 1968D2003 PNEUMATIC SHUTTLE VALVE 1/4" NPT NOS CONDITION IN BOX

FLOWSERVE D8244X3X6 CENTRIFUGAL PUMP NEW CONDITION 5HP

IMPACTO 502-10 PALM PROTECTIVE GLOVE SIZE MEDIUM LEFT HAND NEW IN PACKAGE

IMPACTO 503-10 HAND PROTECTIVE GLOVE/GLOVE LINER SIZE SMALL RIGHT HAND NIP

GOULD EF3-AO25 I-T-E CIRCUIT BREAKER 25A 3 POLE 600V ADJUSTABLE TRIP NOS IN BOX

TEXAS INSTRUMENTS PM550-212 POWER SUPPLY 120/240 INPUT EXCELLENT USED CONDITION

VALENITE STFER-10CA-13 INDEXABLE INSERT CARTRIDGE NEW CONDITION IN PACKAGE

JOHNSON CONTROLS D-3062-102 DAMPER LINKAGE / MOUNTING BRACKET KIT NEW IN BOX

POWERVOLT BVA-24DS4.8 T0VPS POWER SUPPLY 24VDC NOS CONDITION IN BOX

LEADER 5872A  WAVEFORM MONITOR / VECTORSCOPE NEW CONDITION IN BOX

EMECANIQUE XCKJ7956F3647 INTERLOCK SAFETY SWITCH KIT NEW CONDITION NO BOX

EMECANIQUE XCKJ5954F0-547 INTERLOCK SAFETY SWITCH KIT NEW CONDITION NO BOX

TACO/BALDOR KS1013AE2MCS174M WATER PUMP ASSEMBLY 30HP 1500GPM  NEW CONDITION

ENIDINE OEM-3.0M X 6.5 ADJUSTABLE HYDRAULIC SHOCK ABSORBER NEW CONDITION IN BOX

UFM UNIVERSAL FLOW MONITORS XHF-Q1F800GM-48W-32V1.0-R0WD VANE FLOW METER  6" NEW

UFM UNIVERSAL FLOW MONITORS X-ABF600GPM-32F-R0WD VANE STYLE FLOW METER 4"  NEW