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編程規(guī)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(xí)慣采用梯形圖編程。梯形圖編程有些基本要求和規(guī)則，也有一些規(guī)律可循。
    2.1梯形圖設(shè)計(jì)的基本原則
    PLC編程應(yīng)注意以下基本原則。
    （1）外部輸入/輸出繼電器、內(nèi)部繼電器、定時(shí)器、計(jì)數(shù)器等軟元件的觸點(diǎn)可重復(fù)使用，沒有必要特意采用復(fù)雜程序結(jié)構(gòu)來減少觸點(diǎn)的使用次數(shù)。
    （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(diǎn)可以放在線圈的右邊，但在梯形圖中觸點(diǎn)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(jié)果必須有條件。必要時(shí)可以使用一個(gè)內(nèi)部繼電器的動(dòng)斷觸點(diǎn)或內(nèi)部特殊繼電器來實(shí)現(xiàn)。參見圖6-11所示。

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廈門仲鑫航自動(dòng)化設(shè)備有限公司

（4）同一編號(hào)的線圈在一個(gè)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(shí)前面的輸出無效，只有zui后的輸出才有效。但該輸出線圈對(duì)應(yīng)觸點(diǎn)的動(dòng)作，要根據(jù)該邏輯運(yùn)算之前的輸出狀態(tài)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(gè)M1輸出變化，Y1隨*個(gè)M1線圈變化，而Y2隨第二個(gè)M1輸出變化。所以，一般情況下，應(yīng)盡可能避免雙線圈輸出。

    （5）梯形圖程序必須符合順序執(zhí)行的原則，即從左到右，從上到下執(zhí)行，如不符合順序執(zhí)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(lián)的觸點(diǎn)次數(shù)沒有限制，可以無限制的使用

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DODGE F2BZSC115 FLANGE PILLOW BLOCK BEARING 056845  1-15/16 BORE NEW IN BOX

DODGE NSTUVSC108 TAKE-UP BEARING 1-1/2" BORE P/N 125542 NEW CONDITION IN BOX

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GMN  S6013CTAA7DUM PRECISION BEARINGS (MATCHED SET) NEW IN BOX

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SKF 61816 ROLLER BALL BEARING NEW SEALED CONDITION IN BOX

AMERICAN MODEL A-4334-70101 CYLINDRICAL ROLLER BEARING 3-15/16" BORE  NEW NO BOX

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OHIO GEAR CRD3 31.40 Y MQ140 IN LINE GEAR REDUCER 32.28:1 RATIO NEW CONDITION

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GE GENERAL ELECTRIC 5KCP39PG L151AS MOTOR 1/2HP 460V 1 PH 1075 RPM NEW NO BOX

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GROVE GEAR DXFHM0242-1 FLEXALINE GEAR REDUCER 125:1 NOS CONDITION NO BOX

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HELICAL 5246-6MM-6 FLEXIBLE SHAFT COUPLINGS  (SET OF 4) NEW IN PACKAGE

WARNER ELECTRIC 104-0011 SPLINED ADAPTER  NEW CONDITION NO BOX

CONE DRIVE MSHO35A025-4 SPEED REDUCER 40:1 RATIO  NEW CONDITION

BROWNING 6WBP SYNCROGEAR REDUCER E458/P04130570N RATIO 36.6:1 NEW CONDITION

NORD GEAR 9032.1AZ N56C UNICASE SPEED REDUCER 75.91:1  NEW CONDITION NO BOX

MASTER POWER TRANSMISSION 7867351001KR SPEED REDUCER 50:1 NEW CONDITION

DODGE QUANTIS HB682GH71C4 SPEED REDUCER P/N 6532017-1AG 34.49:1  NEW CONDITION

FALK 08UCBN2A7.1N1 DOUBLE REDUCTION HELICAL IN-LINE SPEED REDUCER 7.396:1 NEW

MORSE RAIDER 375UR20 SPEED REDUCER 20:1  P/N XJ0015K03K NEW CONDITION

DODGE TIGEAR SPEED REDUCER 5524747 001 BC  5:1 RATIO  NEW CONDITION

DODGE TIGEAR 2 SPEED REDUCER P/N 23Q10R180  10:1 RATIO  NEW CONDITION

CONE DRIVE TEXTRON MOQ50A023-A6 GEARBOX / REDUCER 900:1 RATIO  NOS CONDITION

TEXTRON HV35A068-X8B CONE DRIVE REDUCER 30:1 RATIO  NOS CONDITION

US ELECTRICAL MOTORS M80 GEAR REDUCER 30:1 1750 RPM NEW CONDITION / NO BOX

OHIO GEAR RA3 GEARBOX  1:1 RATIO DUAL OUTPUT SHAFTS 1-3/8" DIA. NOS CONDITION

SSB ANTRIEBSTECHNIK / GRAESSNER MOTOR / GEARBOX ASSEMBLY KS40FL 49:1 460V NEW

MANNESMANN DEMAG AF08 B3 111 / KBA80A6 REDUCER MOTOR ASSY.  NEW CONDITION NO BOX

MANNESMANN DEMAG KBA112B4 MOTOR 7.2 HP 1725 RPM 230/460V NEW CONDITION NO BOX

RELIANCE ELECTRIC P21G3891A ELECTRIC MOTOR 2HP 460V 3 PHASE 1175 RPM  NEW

VIKING PUMP IDEX 3-551-012-795 SIZE C HELICAL GEAR REDUCER 7.95:1 NEW IN BOX

DODGE 3069426A001PX MASTER XL SPEED REDUCER 60:1 RATIO 140CM21F  NEW CONDITION

DODGE TIGEAR 2 RIGHT ANGLE SPEED REDUCER P/N 35Q20R18  20:1 RATIO  NEW CONDITION

DODGE 180TM21A MASTER XL PARALLEL REDUCER 38.5:1 P/N 079163-24-BA NEW CONDITION

RELIANCE ELECTRIC C56H2590M-RQ AC MOTOR 1/2HP 115/230V 1PH 1725RPM  NEW NO BOX

DODGE / RELIANCE TIGEAR MR94763L1 MOTOR REDUCER ASSEMBLY 200/500V  NEW NO BOX

SEW-EURODRIVE R27DT71D4-KS MOTOR/REDUCER ASSEMBLY 11.86 TO 1 NOS CONDITION

FALK 1020T10 COVER GRID ASSEMBLY P/N 0775801 NEW CONDITION NO BOX

DAYTON 3N641B INDUSTRIAL MOTOR 1/2 HP 3 PHASE 230/460V NEW CONDITION IN BOX

DYNACORP INC 304196-4 MOTOR CLUTCH / BRAKE 90V 5/8" BORE/SHAFT NEW NO BOX

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SANDEX 10FN-S9062L-S3VW1/X OSCILLATING/INDEXING HANDLER SANKYO NEW

FANUC  A06B-0752-B200 SPINDLE MOTOR MODEL 2S 

SIEMENS 1FT50621AC714FA0 SERVO MOTOR 1FT5062-1AC71-4FA0

STEARNS CTS-35ST TOR-AC THRU SHAFT CLUTCH/BRAKE  P/N 211319001001  NEW NO BOX

LOVEJOY 14410 1-3/8" HEX A DRIVE VARIABLE SPEED PULLEY P/N 68514421970  NNB