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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

MRC 1906S OPEN BALL BEARING 00231 NEW CONDITION IN BOX

SKF 62201-2RS1 BALL BEARING 12 X 32 X 14MM 09378 SET OF 2 NEW CONDITION IN BOX

SKF 6204-2RS1 BALL BEARING 47 X 20 X 14MM 75875 62042RS1 NEW CONDITION IN BOX

NSK 6212VVC3 SEALED BALL BEARING 60 X 110 X 22MM 01522 NEW CONDITION IN BOX

SKF 6006-2RS1 SINGLE ROW BALL BEARING 30 X 15 X 13MM 40001 NEW CONDITION IN BOX

MRC 205SZZG SEALED BALL BEARING WITH SNAP RING 00343 NEW CONDITION IN BOX

GENERAL 6210E OPEN BALL BEARING 50 X 90 X 20MM 6210-00-30E NEW CONDITION IN BOX

FAFNIR 9307K RADIAL BALL BEARING NEW CONDITION IN BOX

FAFNIR 7206WN-SU RADIAL BALL BEARING 30 X 62 X 16MM NEW CONDITION IN BOX

TIMKEN L217849-3 PRECISION TAPERED ROLLER BEARING CONE NEW CONDITION IN BOX

TIMKEN L217810-3 PRECISION 3000 TAPERED ROLLER BEARING CUP NEW CONDITION IN BOX

SKF 7007ACD/P4ADGA PRECISION BEARING SET 7007ACDP4ADGA NEW CONDITION IN BOX

SKF 7209CD/P4ADGA PRECISION BEARING SET 7209CDP4ADGA NEW CONDITION IN BOX

SKF 7009CD/P4ADGA PRECISION BEARING SET 62518 7009CDP4ADGA NEW CONDITION IN BOX

MRC 1909SZZ BALL BEARING 45MM X 68MM X 12MM 1909-SZZ NEW CONDITION IN BOX

MRC 1909S BALL BEARING 45MM X 68MM X 12MM 1909-S NEW CONDITION IN BOX

TIMKEN 15578 TAPERED ROLLER BEARING CONE NEW CONDITION IN BOX

SKF 22217CCK/C3W33 SPHERICAL ROLLER BEARING 22217 NEW CONDITION IN BOX

FAFNIR LSA02-3/16 PB BEARING 2-3/16" BORE *NO COLLAR* NEW CONDITION NO BOX

SKF SYV510 1-15/16" BORE PILLOW BLOCK BEARING 479210-115 NEW CONDITION NO BOX

NTN UCPX10-115 1-15/16" BORE PILLOW BLOCK BEARING UCPX10115 NEW CONDITION NO BOX

BROWNING VF2E-223 1-7/16" BORE FLANGE TYPE PB BEARING NEW CONDITION NO BOX

INA 30MM BORE FLANGE TYPE PILLOW BLOCK BEARING W/ COLLAR NEW CONDITION NO BOX

FAFNIR RCJT15/16 FLANGE TYPE PILLOW BLOCK BEARING W/ COLLAR NEW CONDITION NO BOX

DODGE 124102 F4BSC015 15/16" HOUSING MOUNTED BALL BEARING NEW CONDITION IN BOX

DODGE 131054 RCJT3/4 F2B-8XR-012 2-BOLT FLANGE BEARING NEW CONDITION IN BOX

DODGE 124275 F2B-SC-103 1-3/16" 2 BOLT FLANGE BEARING NEW CONDITION IN BOX

FAFNIR 211KG OPEN BALL BEARING 55MM ID X 100MM OD NEW CONDITION IN BOX

NSK 6203VC3 BALL BEARINGS 17MM X 40MM X 12MM (SET OF 2) NEW CONDITION IN BOX

MCGILL CF 5 S CAMROL CAMFOLLOWER  5" DIA. 2" DIA. SHAFT CF5S  NEW IN BOX

INA RUE35 B 1622/2 LINEAR BEARING BLOCK W/ TSX35 BHJ LINEAR RAIL NEW NO BOX

TIMKEN JM718110 TAPERED ROLLER BEARING CUP 5.709" OD NEW CONDITION IN BOX

INPRO 1250/2250X VBX SEAL BEARING ISOLATOR NEW CONDITION IN BOX

DODGE F4BSCM212 FLANGE TYPE PILLOW BLOCK BEARING 2-3/16" BORE NEW / NO BOX

DODGE F2BSCM211 FLANGE TYPE PILLOW BLOCK BEARING 2" BORE NEW CONDITION / NO BOX

ASAHI UCP208 PILLOW BLOCK BEARING 40MM BORE NEW CONDITION / NO BOX

ASAHI UCP208 PILLOW BLOCK BEARING 40MM BORE NEW CONDITION IN BOX

SEALMASTER SPM 31 PILLOW BLOCK BEARING 1-15/16" BORE NEW CONDITION / NO BOX

SEALMASTER SP-27 PILLOW BLOCK BEARING 1-11/16" BORE NEW CONDITION / NO BOX

FAFNIR YCJT FLANGE TYPE PILLOW BLOCK BEARING 2-BOLT 1-15/16" BORE NEW NO BOX

PEER FTUC212-39 FLANGE TYPE PILLOW BLOCK BEARING 2-BOLT 2-7/16" BORE NEW NO BOX

INA F11 KWE35 62V2 LINEAR BEARING BLOCK  NEW CONDITION / NO BOX

ALINABAL USA VF-6 ROD ENDS WITH STUD 3/8-24 RH THREAD (SET OF 3) NEW NO BOX

MCGILL MI-54 INNER RACE NEW CONDITION IN BOX

FAFNIR 202PPG27 SEALED BALL BEARINGS (SET OF 3) NEW CONDITION IN BOX

DODGE FC-E-050MR-NL FLANGE TYPE PILLOW BLOCK BEARING P/N 054848 50MM BORE  NIB

MCGILL MB25 2-1/4 BEARING INSERT 2-1/4" BORE  NEW CONDITION IN BOX

FAFNIR 207 OPEN DEEP GROOVE BALL BEARING NEW SEALED CONDITION IN BOX

SKF 6207 / C3 DEEP GROOVE BALL BEARING NEW SEALED IN PACKAGE / NO BOX

BARDEN L-32 PRECISION LINEAR BEARING  NOS CONDITION IN BOX

ANDREWS BEARING B27 JB1 THRUST BALL BEARING NEW CONDITION IN BOX

AURORA SPHERICAL ROD END BEARINGS 3/4" BORE 3/4-16NF RH THREAD (SET OF 2)  NEW

SKF 61908-2RS1 PRECISION BALL BEARING SEALED BOTH SIDES NEW CONDITION IN BOX

SKF 206-ZNR SHIELDED ONE SIDE BALL BEARING 30 X 60 X 16MM NEW CONDITION IN BOX

INA D17 THRUST BEARING   NEW CONDITION IN BOX

INA NA49082RS NEEDLE ROLLER BEARING   NEW CONDITION IN BOX

IKO NIPPON THOMPSON CF18VBUUR CAM FOLLOWER NEW CONDITION IN BOX

THOMSON A122026 BALL BUSHING / LINEAR BEARING NEW CONDITION IN BOX

DODGE WSTU2104R CENTER PULL TAKE UP BEARING UNIT 1-1/4" BORE P/N 044875  NNB

SKF HM218248 / HM218210 TAPERED ROLLER BEARING ASSEMBLY NEW CONDITION / NO BOX

KML W210PPB2 BEARING INSERT 1-15/16" BORE NEW CONDITION / NO BOX

ROBERTS RXP-23 PILLOW BLOCK BEARING 1-7/16" BORE NEW CONDITION / NO BOX

LINK BELT P3U224E3 PILLOW BLOCK BEARING 1-1/2" BORE NEW CONDITION / NO BOX

MCGILL MI14 INNER RACES  (SET OF 3) NEW CONDITION IN BOX

NSK 35BWD01C DOUBLE ROW BALL BEARING 1-3/8" BORE NEW CONDITION / NO BOX

FAFNIR 5203K DOUBLE ROW BALL BEARING  NEW CONDITION SEALED / NO BOX

FAFNIR 5303K DOUBLE ROW BALL BEARING  NEW CONDITION SEALED / NO BOX

FAFNIR 5205K DOUBLE ROW BALL BEARING  NEW CONDITION / NO BOX

FAFNIR 5205KD DOUBLE ROW BALL BEARING SHIELDED ONE SIDE NEW IN BOX

MRC 5208MZZ SEALED DOUBLE ROW BALL BEARING NEW CONDITION / NO BOX

NSK DB750 25TAC62B SU PRECISION THRUST ROLLER BEARING 25 X 62 X 15MM NEW NO BOX

THK HSR35 LINEAR BEARING BLOCK  NEW CONDITION / NO ORIGINAL BOX

NTN 6911 DEEP GROOVE ROLLER BEARING  NEW CONDITION / NO BOX

SKF 7206CD/P4ADGB PRECISION ROLLER BEARING NEW SEALED CONDITION IN BOX

FAFNR GC1103KRRG2 BEARING INSERT 1-3/16" BORE NEW CONDITION / NO BOX

BARDEN 104HDL PRECISION ROLLER BEARING  NEW SEALED CONDITION IN BOX

EBC 6203 C4 DEEP GROOVE BALL BEARINGS 40 X 17 X 12MM (SET OF 10)  NEW CONDITION 

NTN 6204Z SHIELDED BALL BEARINGS (SET OF 4) NEW CONDITION SEALED IN PACKAGE

FAFNIR MODEL W209PP SEALED ROLLER BEARING NEW CONDITION NO BOX

REXNORD LINK-BELT PB224M35H PILLOW BLOCK BEARING 35MM BORE/SHAFT NEW NO BOX 

TIMKEN IR-243220 BEARING RACES (SET OF 2)  NEW CONDITION IN BOX

LINK BELT FCB224M50H FLANGE TYPE PILLOW BLOCK BEARING 50MM BORE NEW IN BOX

SKF 6207/C3 DEEP GROOVE BALL BEARING NEW CONDITION IN BOX

SKF NU 210 ECP CYLINDRICAL ROLLER BEARING 50 X 90 X 20MM NEW CONDITION IN BOX

TIMKEN 05180D DOUBLE TAPERED ROLLER BEARING CUP NEW CONDITION / NO BOX

NTN 510039 TAPERED ROLLER BEARING NTN P/N AU0901 NEW CONDITION IN BOX

TIMKEN 516006 WHEEL BEARING NEW CONDITION IN BOX 

TIMKEN HB-14 DRIVESHAFT SUPPORT BEARING ASSEMBLY NEW CONDITION IN BOX

AMI BEARINGS UCF210 FLANGE TYPE PILLOW BLOCK BEARING 50MM NEW IN BOX

FAFNIR 3MM9110WICRDUL SUPER PRECISION ANGULAR CONTACT BEARINGS (SET OF 2) NNB

DODGE WSTU-LT7-208USE WS-502FR TAKE-UP BEARING 2-1/2" BORE  033886 NEW CONDITION

ACCURATE BUSHING CO. CR-1-XBE CAM FOLLOWER  NEW CONDITION IN BOX

TIMKEN TRD-4052 THRUST BEARING WASHERS (SET OF 2)   NEW IN BOX

INA SCH1413-P NEEDLE ROLLER BEARING 6011411  NEW CONDITION IN BOX

SKF 62305-2RS1 SEALED BALL BEARING  .983 BORE  NEW CONDITION IN BOX

BROWNING PB251 PILLOW BLOCK BEARING 1-1/2" BORE  NEW CONDITION / NO BOX

TIMKEN 72200 TAPERED ROLLER BEARING CONE  2" BORE  NOS CONDITION IN BOX

CONSOLIDATED BEARINGS LER113 ALUMINUM PILLOW BLOCK SEAL RING  NEW IN BOX

SKF 626 ZJEM ROLLER BEARINGS (SET OF 2) NEW CONDITION IN BOX

INA 22Z02 THRUST BALL BEARING   NEW CONDITION IN BOX

SKF 6211 2ZNRJEM DEEP GROOVE BALL BEARING 2.164 ID / 3.937 OD  NEW IN BOX

FAFNIR 7306WNSU RADIAL BALL BEARING 1.179 ID / 2.835 OD  NEW IN BOX

CONSOLIDATED NN-3017-KMS P/5 DOUBLE CYLINDRICAL ROLLER BEARING TAPER BORE  NIB

KOYO 6021 DEEP GROOVE ROLLER BALL BEARING 4-1/8"ID 6-5/16"OD  NEW NO BOX

BROWNING VF3S-119M FLANGE TYPE PILLOW BLOCK BEARING 1-3/16" BORE  NEW IN BOX

DODGE P2B-S2-315R PILLOW BLOCK SPHERICAL ROLLER BEARING 3-15/16" BORE 070290 NIB

BOWER BCA 568 TAPERED ROLLER BEARING CONE NEW CONDITION IN BOX

DODGE SXR1 205 PILLOW BLOCK BEARING . 1" BORE  NEW NO BOX

FAFNIR VCJ 1 1/2 FLANGE TYPE PILLOW BLOCK BEARING 1-1/2" BORE NEW IN BOX

REX ZT82208 TAKE-UP ROLLER BEARING UNIT 2-1/2" BORE  NEW CONDITION IN BOX

TIMKEN 565 90016 MATCHED TAPERED ROLLER BEARING ASSEMBLY NEW CONDITION IN BOX

REX ZT42107 TAKE-UP PILLOW BLOCK ROLLER BEARING UNIT  1-7/16 BORE  NEW

REX ZT42108 TAKE-UP PILLOW BLOCK ROLLER BEARING 1-1/2 BORE  NEW CONDITION IN BOX

DODGE HS2HC656 HINGED CAP PILLOW BLOCK P/N 067078  NEW CONDITION IN BOX

SEALMASTER MFCH-24T FLANGE BEARING 1-1/2" BORE   NEW

SKF MODEL SI 20 ES-2RS SPHERICAL BEARING ROD END 20MM BORE NEW CONDITION

FAFNIR RAS1 11/16  PILLOW BLOCK BEARING 1-11/16" BORE NEW CONDITION NO BOX

SEALMASTER MFCH-24 FLANGE TYPE PILLOW BLOCK BEARING 1-1/2" BORE NEW IN BOX

REXNORD ZB2308S FLANGE TYPE PILLOW BLOCK BEARING 3-1/2" BORE NEW IN BOX

DODGE P2B-SXR-112 PILLOW BLOCK BEARING 1-1/2" BORE NEW - NO COLLAR

BROWNING MODEL VF4S-219 FLANGE BEARING 1-3/16 NIB!!

BROWNING VPS-340 PILLOW BLOCK BEARING 2 1/2" NIB!!!

BROWNING MODEL VF4S-119 FLANGE BEARING 1-3/16 NIB!!

SKF 22324 CCK/C3W33 SPHERICAL ROLLER BEARING NEW CONDITION IN BOX

BCA 5208KE DOUBLE-ROW ANGULAR-CONTACT BEARNG NEW NO BOX

LINK-BELT H3128079 ADAPTER SLEEVE 4-15/16" NEW CONDITION IN BOX

FEDERAL MOGUL 5207-KE DOUBLE ROW BALL BEARING 5207KE NEW CONDITION IN BOX

RBC MODEL IR8407 INNER RACE NEW CONDITION IN BOX

NAPA MODEL BR13687 TAPERED BEARING CONE NEW IN BOX!!!

INA 2911 UNI-DIRECTIONAL THRUST BALL BEARING NEW CONDITION IN BOX

NAPA / SKF  MODEL BR13621 TAPERED BEARING CUP NEW IN BOX!!!

BCA 5208KE DOUBLE-ROW ANGULAR-CONTACT BEARNG NEW IN BOX

NICE 1638DCTN BALL BEARING NEW CONDITION IN BOX

ROLLWAY MODEL AT-610 THRUST ROLLER BEARING NEW CONDITION IN BOX

FEDERAL MOGUL 5210-W DOUBLE-ROW BALL BEARING NIB!!!

OSBORN HPJA-90 HEAVY DUTY LOAD RUNNER/IDLER ROLLER P/N 96212 NEW CONDITION

OSBORN FLRY-3 HEAVY DUTY LOAD RUNNER P/N 96220 NEW CONDITION IN BOX

FAFNIR VCJ-1-3/16 FLANGE BEARING 1-3/16" BORE NEW CONDITION NO BOX

FAFNIR RME35 FLANGE BEARING 35MM BORE NEW CONDITION NO BOX

BROWNING VFCS-222 1-3/8" FLANGE BEARING NEW CONDITION NO BOX

RHP NP3/4EC PILLOW BLOCK BEARING 3/4" BORE NEW CONDITION IN BOX

TIMKEN MODEL 6389 TAPERED BEARING CONE NEW CONDITION IN BOX

FAG 22226EASK.M.C3 SPHERICAL ROLLER BEARING NEW CONDITION / NO ORIGINAL BOX

TIMKEN LM613449 TAPERED ROLLER BEARING CONE NEW CONDITION IN BOX