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為了實現被控對象的工藝要求，以提高生產效率和產品質量。

1.      PLC的選擇除了應滿足技術指標的要求外，還應重點考慮該公司產品與售后服務情況。（盡量選擇主流產品）

2.      zui大限度地滿足被控對象的控制要求。

3.      在滿足控制要求的前提下，力求使控制系統簡單、經濟，使用及維修方便。

4.      保證控制系統得安全、可靠。

5.      考慮到生產的發展和工藝的改進，在選擇PLC容量時，應適當留有余量。

盡管梯形圖與繼電器電路圖在結構形式、元件符號及邏輯控制功能等方面相類似，但它們又有許多不同之處，梯形圖具有自己的編程規則。

鄭娟萍

廈門仲鑫航自動化設備有限公司  

1）每一邏輯行總是起于左母線，然后是觸點的連接，zui后終止于線圈或右母線（右母線可以不畫出）。注意：左母線與線圈之間一定要有觸點，而線圈與右母線之間則不能有任何觸點。

2）梯形圖中的觸點可以任意串聯或并聯，但繼電器線圈只能并聯而不能串聯。

3）觸點的使用次數不受限制。

4）一般情況下，在梯形圖中同一線圈只能出現一次。如果在程序中，同一線圈使用了兩次或多次，稱為“雙線圈輸出”。對于“雙線圈輸出”，有些PLC將其視為語法錯誤，不允許；有些PLC則將前面的輸出視為無效，只有zui后一次輸出有效；而有些PLC，在含有跳轉指令或步進指令的梯形圖中允許雙線圈輸出。

5）對于不可編程梯形圖必須 經過等效變換，變成可編程梯形圖。

SOLA TYPE CVS CONSTANT VOLTAGE TRANSFORMER 23-22-112-2 104540

SQUARE D .500KVA 1-PH TRANSFORMER 500SV1B 102678

TROMBETTA CORP. 110V 60CYC TRANSFORMER F-324

WINSSON ENTERPRISES CO. TRANSFORMER REV.B 62-1106 99896

TRANSFORMER 091224 UTU 19751

TRANSFORMER 12VDC 90112C12

WESTINGHOUSE 60HZ TYPE EPB SINGLE PHASE TRANSFORMER TYPE 2  2D46502H01

SOLA 0.8A 95-130V CONSTANT VOLTAGE TRANSFORMER 23-13-060-2

ALLEN BRADLEY  CIRCUIT TRANSFORMER 50/60 HERTZ X-343858

100/220V TRANSFORMER UTU 19730 / 100223

SPITZNAGEL 230V 50-60HZ ENCLOSED POWER TRANSFOMER  NNB D 78609

IMPERVITRAN .350KVA CONTROL TRANSFORMER B350-0377-1 104496

CHUAH SHUN ELECTRIC CLASS B TRANSFORMER 430-0141 99881

SOLA MCR 120V MINI/MACRO COMP. REGULATOR 63-23-112-4

MIDWEST ELECTRIC CURRENT TRANSFORMER 3CT115B 104733

KASUGA CURRENT TRANSFORMER 50/60HZ 15VA A153K

UNKNOWN TRANSFORMER UTU 18240 090922

C.T.O CERAMIC TRANSFORMER 69089-6R

TRANSFORMER TR-11036 69000-2-R

FINCOR 350VA (.350KVA) TRANSFORMER 1039818-08

ABB GST 26/09KW TRANSFORMER 3ADT 745 054

FOXBORO MAGNETIC GLOW TRANSMITTER  IMT20-PA10FGZ 102757

SQUARE D TRANSFORMER W/ FUSE HOLDER 9070TF300D1

ROMAN 1PH 650V 170KVA WELDING TRANSFORMER MODEL TRU84BX-M 101942

INSTRUMENT TRANSFORMERS CURRENT TRANSDUCER PCL-20 102461

HAMMOND TRANSFORMER 100VA 50/60HZ MT100MQMJ

DELTEC DT SERIES TRANSFORMER DT 25T1 / 5122072 105549

ACME TRANSFORMER 500VA TYPE-NO TRANSFORMER TA-2-81215 100055

ACME 3PHASE 600V TRANSFORMER ALRC-008TBC

FOXBORO ELECTRONIC TRANSMITTER 0-14PH  870PH-70 102761

CUTLER HAMMER  TRANSFORMER 600V 1A C340BG SERIES A1

NANA ELECTRONICS 200A-4V TRANSFORMER NNC-20CA-SH 99703

FANUC ROBOTICS 24A REACTOR  A81L-0001-0083#3C

TRANS FEC FORMER TRANSFORMER 50/60HZ T-1 [HASE 1

HOLOPHANE 400WHPS TRANSFORMER BL-54 105039

YASKAWA 50/60H 107VA TRANSFORMER CPT10199

OBARA WELDING TRANSFORMER RT656F-506

BROWNELL 100:5 A CURRENT TRANSFORMER  2 SFT-101 103725

UNIVERSAL LIGHTING TECH AUTOTRANSFORMER M175MLTAC3M 102488

UNKNOWN MFG MICRO TRANSFORMER LOT OF 2 40-9101 69743-4A

DAYKIN TRANSFORMER 500VA DKN 180

MCI CURRENT TRANSFORMER  06-115903-057

BROWNELL ELECTRO CURRENT TRANSFORMER  103278

750VA 240/480V 1PH 60HZ TRANSFORMER CS750LX/X

ROMAN 1PH 440V 120KVA WELDING TRANSFORMER F4466120C1BB 100470

GE RENEW COIL 3199878 102723

EGS INDUSTRIAL CONTROL TRANSFORMER 50/60HZ E250 CLASS 105

GENERAL ELECTRIC TRANSFORMER 90/208V 60HZ  9T22B5203

IMPERVITRAN 50/60HZ .050KVA TRANSFORMER B050BTZ13JK 103869

ACME CONTROL TRANSFORMER 250VA 50/60HZ TA-2-81213

EMB 0,184KVA 230V TRANSFORMER TTT 0,25 / 14026801/02/09 99582

SUN HYDRAULICS  CURRENT TRANSFORMER 24VDC 770-224 OFG7

CURRENT TRANSFORMER RATIO 50:5A 600V  5RBL-500 98931

SQUARE D 1 PHASE .500 KVA 60HZ TRANSFORMER  500SV1B

HAMMOND TRANSFORMER 60H 1500VA EP6P TYPE E

ROMAN 1PH 50KVA WELDING TRANSFORMER S46650X2238 100005

HAMMOND 14A TRANSFORMER 185G12

POWERTRAN 1PHASE 1KVA TYPE FB TRANSFORMER PTN102-1K

SQUARE D 50/60HZ TRANSFORMER 9070TF350D1 99055

ALLEN BRADLEY  CONTROL CIRCUIT TRANSFORMER  1497-N2

TRAFOMIC OY 250VA TRANSFORMER 251971 / 16213 104487

RELIANCE TRANSFORMER ASSEMBLY NIB TR11070 / 69000-3R

SQUARE D TYPE 3R 1PH 60HZ 15KVA TRANSFORMER 15S40F 100295

EIL CURRENT TRANSFORMER 60:5 RT-600 600V RT-600

ROMAN 150KVA WELDING TRANSFORMER F486150DL3114-S

RELIANCE ELECTRIC VOLTAGE TRANSFORMER TR-9735 64977-49R

IMPERVITRAN CONTROL TRASNFORMER .350 KVA  B350BTZ13 104022

SQUARE D 50/60HZ  0.05KVA TRANSFORMER 9070T50D2 101028

TRANSFORMER 387540-600 REV A  99884

RELIANCE ELECTRIC TRANSFORMER 50:1 64670-4-RX

GENERAL ELECTRIC COIL  115/120VDC  1D106G3A

POWERTRAN 2KVA 1PHASE TYPE-FB TRANSFORMER PTN102-2K

GE TRANSFORMER 55-172809G008

GENERAL ELECTRIC TRANSFORMER 400W S-51 HPS GES400ML5AA4-5

GENERAL SIGNAL GS HEVI-DUTY .250KVA TRANSFORMER T250

EATON 50 /60 1500/5A HZCURRENT TRANSFORMER HF7A P2 741H0060 100120

CUTLER HAMMER  CONTROL TRANSFORMER C0350E2AFB

RELIANCE ELECTRIC 110V COIL TRANSFORMER 50/60 CY 193L1

JEFFERSON ELECTRIC  .250KVA 1PH POWERFORMER TRANSFORMER 211-041

ALLEN BRADLEY  TRANSFORMER  1497-G-BASX-0-N SER A

STEARNS 380/480VAC 50/60HZ TRANSFORMER 635460609 9921 103381

SHENZEN TRANSFORMER MODEL AL-B 109-010ALB-06

SIGNAL CLASS B-3 TRANSFORMER DP-241-8-24 99477

CONTACT INDUSTRIES CURRENT TRANSFORMER CT100C-24B1

ACME TRANSFORMER 1000VA 50/60HZ TRANSFORMER TA-2-81217

MICRON IMPERVITRAN 100VA CONTROL TRANSFORMER B100MBT713RK 102918

MGM 15KVA 240/480V 60H TYPE HS DRY TYPE TRANSFORMER HS15C3B2SH

INSTRUMENT TRANSFORMERS 50:5 A RATIO 600V TRANSFORMER 5SFT-500

WESTINGHOUSE 100:5 RATIO CURRENT TRANSFORMER 7524A98G01 105541

DAYKIN TRANSFORMER TS106

GE FANUC REACTOR TRANSFORMER A81L-0001-0101#C

CUTLER HAMMER  TRANSFORMER 250VA 50/60HZ C0250E2A

TOYO CURRENT TRANSFORMER JIS C1731 YAL-1

ALLEN BRADLEY  TRANSFORMER 250VA 60HZ LR38216 TYPE H

KYOSHIN 480/800VA 1PHASE 100V CONTROL TRANSFORMER

EMB 0.5A 12V 220/242V TRANSFORMER GT 0,03 / 13961301/04/09 99672

ROMAN 136KVA TRANSGUN WELDING TRANSFORMER T486136X5411

POWERTRONIX TRANSFORMER AA-015536 REV. B

FEC INC. 750VA 1PH TRANSFORMER T-1

ACME 1PH 60HZ 240X480 TO 120/240V 5KVA TRANSFORMER T-2-53014-4S

NECO HAMMOND TRANSFORMER 250V 1PH 511AO6GU2

ACME TRANSFORMER TRANSFORMER 120X240V 1.0KVA  T-3-53040-S

ALLEN BRADLEY  1321-3TH005-BB 5KVA TRANSFORMER 1321-3TH005-BB

INSTRUMENT TRANSFORMERS 200:0.2 A 50-400 HZ 600V CURRENT SFT-201-0.2 101609

MICRON CONTROL IMPERVITRAN 250VA TRANSFORMER B250-0834-8 104140

REX MANUFACTURING ENCL. 3R 1PH 7.5KVA TRANSFORMER SC7LK/E3R

RELIANCE ELECTRIC 230V CONTACTOR COIL NIB 76628-AX

HAMMOND NEMA 3R 3PH DRY TYPE 75KVA TRANSFORMER 166288

ACME TRANSFORMER  3 PH 60HZ 600V AC LINE REACTOR ALRC-003TBC

HAMMOND TYPE E 60HZ 240/480V 1 PHASE TRANSFORMER EN6P 100650

INSTRUMENT TRANSFORMERS 120V 50/60HZ CURRENT TRANSDUCER PCL 102622

RITZ 50-60HZ TRANSDUCER KSO 104/2 98963

ALLEN BRADLEY  550V TYPE-M CONTROL CIRCUIT TRANSFORMER X-343909 103446

DAYKIN TRANSFORMER DISCONNECT 60HZ 2000VA LTFS-01 U

IMPERVITRAN 50/60HZ .150KVA TRANSFORMER B150-0833-8 103929

INSTRUMENT TRANSFORMERS 75:A 10KV 600V CURRENT TRANSFORMER 2 SFT-750 104402

SAO ELECRTRIC MFG. CO. LTD. 8KVA TRANSFORMER UABUL180K8

TRANSFORMER 1053367 TTI-14016 1229-8910

INSTRUMENT TRANSFORMERS 400:5A 600V 50-400HZ Y25645-008-06

DONGAN TRANSFORMER 50/60HZ  33-250-PM

FUNAHASHI ELECTRIC CO. 9KVA TRANS FEC FORMER TRANSFORMER TYPE T-3

ACME CONTROL TRANSFORMER  T-68328 / 19B209496P1

IMPERVITRAN 50/60HZ .150KVA TRANSFORMER B150-0894-8 103912

TIME MARK CURRENT TRANSFORMER 50:5 1VA 50-400HZ 276B50

230/460V 1PH 25VAC CONTROL TRANSFORMER 04P08-00031-00

HPS SINGLE-PHASE STEP DOWN TRANSFORMER, NNB 189350

EMB 12V 220/242V 0,05A 0,5A TRANSFORMER GT 0,03 / 13961301/04/09 99342

MICRON TRANSFORMER 50/60HZ B050MBT713RK

ALLEN BRADLEY  1321-3TH005-BB 7.5KVA TRANSFORMER DM005JJ

SQUARE D 750KVA 50/60HZ INDUSTRILA CONTROL TRANSFORMER 9070 TYPE K750D5 104727

ALLEN BRADLEY  0.130KVA 240/480V TRANSFORMER SER.A 1497-C-BASX-3-N

EMB SW 0.05 0.01KVA TRANSFORMER 31728/27/08 / 8000019232 99116

ALLEN  BRADLEY  .075KVA 220/440V TRANSFORMER SER.B 1497-N2 / X-343858

SQUARE D SCHNEIDER ELECTRIC TYPE 3R 7.5KVA TRANSFORMER 7SQ58112 101965

GS HEVI-DUTY ELECTRIC 5.0KVA TRANSFORMER TYPE SMTR

GENERAL ELECTRIC 50/60HZ KVA .050 TRANSFORMER 9T56Y2922 103916

SAO ELECRTRIC MFG. CO. LTD. 5KVA TRANSFORMER UAB-BUL180K5

HAMMOND NEMA 3R 3PH DRY TYPE 20KVA TRANSFORMER 166290

AWEH KIRCHNER 50/60HZ 400/480/500V TO 400/230V TRANSFORMER KTT66272

SQUARE D 50/60HZ .35 KVA TRANSFORMER 9070TF350D1 100579

EGS SOLA MCR 1500VA TRANSFORMER 63-23-215-8

JEFFERSON ELECTRIC  1 PH 60HZ POWER TRANSFORMER DAMAGED LABEL TYPE 3R

WESTINGHOUSE CURRENT TRANSFORMER 40:5 TYPE ECT-5 254A586G05

ROMAN 1PH 480V 65KVA WELDING TRANSFORMER MODEL TRU80BX 101945
MICRON 575V .350KVA CONTROL TRANSFORMER BZX350W15 103627

VALUTRAN 50/60HZ .250KVA INDUSTRIAL CONTROL TRANSFORMER V250MBT13XK

KASUGA  15VA 50/60HZ 1-A1 CLASS 1.0 CURRENT TRANSFORMER CT 15 3 K 101261

ALLEN BRADLEY  AB20607 TYPE K 5KVA TRANSFORMER D005JJ

ACME TRANSFORMER AC LINE REACTOR 3PH 60HZ 600V ALRC-004TBC

POWERTRAN 1PH 240X480 TO 120V 3KVA STEP-DOWN TRANSFORMER EF480L3000

SOA ELECTRIC 50/60HZ 3PH 4.5KVA TRANSFORMER UABUL180K4P5

EGS SOLA MCR 120/208/240V 5000VA COMPUTER REGULATOR 63-23-250-8

REX MANUFACTURING 240/480 TO 120/240V 15KVA TRANSFORMER SC15LK/E3

WESTINGHOUSE CURRENT TRANSFORMER 100:5 TYPE ECT-5  254A586G08

ADVANCE 277V 1.70A CW AUTOTRANSFORMER 71A8433

HAMMOND 460 TO 460Y/266V 3PH 11KVA DRY TYPE TRANSFORMER DM011JJ 98945

GE 5.00KVA 1PH SERVICENTER TRANSFORMER 9T21S1050 101798

SOLA COPPER LINE DC POWER SUPPLY 39-408

MICRON IMPERVITRAN .150KVA 40HZ  TRANSFORMER BZX150W15 103893

GE 240/480 TO 120/240V 5KVA TYPE QMB TRANSFORMER 9T21B1004G2

ZELISKO 400V 20NM TRANSFORMER ZGS10 / 3.6/10/10/40KV

GE TYPE-IP 2KVA CONTROL TRANSFORMER 9T58B54

ADVANCE 120 VOLTS 1.13 AMP 60 HZ TRANSFORMER REL-2P60-S

TOGI TRANSFORMER 50/60 HZ 200VA TRH200-21N

SOLA CVS 2000VA CONSTANT VOLTAGE TRANSFORMER 23-26-200

GE TYPE ML 3PH 60HZ 11KVA TRANSFORMER 9T21B3004G22

SQUARE D SCHNEIDER ELECTRIC TYPE 3R 5KVA TRANSFORMER 5SQ58111 101978

TEG TRANSISTOR MODULE, DAMAGED KP9 700-65 200908

EGS SOLA MCR 500VA MINI/MICRO COMPUTER REGULATOR 62-23-150-8

SQUARE D TRANSFORMER 60HZ 3S40F

EGS HEVI-DUTY 480 TO 240/120V 9KVA TRANSFORMER HT5F9AS

SOLA COMPUTER REGULATOR 63-23-150-8

ALLEN BRADLEY  300-5 CURRENT TRANSFORMER  80025-158-12 103424

HOLOPHANE 480V 60 HZ 2.3A TRANSFORMER S5Z0D1 101680

EMB SW 0.05 0.01KVA TRANSFORMER TA40B / 13492202/39/08

CENTER 120V CONTROL TRANSFORMER  SPA-150

WESTINGHOUSE 150:5 TYPE ECT 5 CURRENT TRANSFORMER  254A586G09

HAMMOND NEMA 3R 75KVA TRANSFORMER 166288, DENT

WESTINGHOUSE CURRENT TRANSFORMER 50:5 TYPE ECT-5 254A586G06

REX MANUFACTURING 3R 240/480 TO 120/240V 15KVA TRANSFORMER SC15LK/E3R

SQUARE D TRANSFORMER 9070 SER.A K100D1

AZZ BALLAST TRANSFORMER MAR28002U

DAYKIN 480V 6.9A PHASE 1 TRANSFORMER DISCONNECT LTFS-15

HAMMOND POWER SOLUTIONS 240/480V TO 120/240V 5000VA TRANSFORMER EU6P 101797

OBARA W-TT-AA06/C 65KVA WELDING TRANSFORMER RT656F-506

AJAX 3PH PRI. V 380/460 SEC. V MULTI. 47KVA TRANSFORMER 5103722-111-R2

BROWNELL ELECTRO 100:5A 600V 50-400HZ CURRENT TRANSFORMER 2 SFT-101 102970

FANUC ROBOTICS 50/60HZ 8.1KVA TRANSFORMER A80L-0026-0028

EMB 50/60HZ 204/400V 10KVA DTST 12.5 TRANSFORMER 8000023899-01

GE SERVICENTER MINI-UNIT SUBSTATION NP 475A445AAP003 R2

WESTINGHOUSE 4200V 35:1 SINGLE PHASE POTENTIAL TRANSFORMER TYPE PT

DAYKIN ELECTRIC 500V 1.1 AMP 60HZ 1 P TRANSFORMER GPFS-07 U

WESTINGHOUSE CURRENT TRANSFORMER 50:5 TYPE ECT-5 254A586G06

ALLEN BRADLEY  2400V 120V 1.0KVA 1PH VOLTAGE TRANSFORMER 25638-510-01 103249

ELTRA  TRANSFORMATOREN 230V TRANSFORMER GDC 0.13 9800080

HAMMOND NEMA 3R 480/277V 3PH DRY TYPE 75KVA TRANSFORMER DM075KK 100296

PRECITEC TRANSFORMER 350VA 50/60HZ 10OHM ZE SC 800 TR P0800-130-00001

SUPERIOR ELECTRIC POWERSTAT 1.0KVA VARIABLE TRANSFORMER 216CU-2

WESTINGHOUSE CURRENT TRANSFORMER 7:5 TYPE ECT-5 254A586G07

EGS HEVI-DUTY 480 TO 208Y/120V 3PH 6KVA TRANSFORMER HT1F6AS

ABB AQ TRAFO AB SLTF 4 TRANSFORMER 3HAC 6163-1 W/ 3HAC 6326-1 101281

IMEL POLAND 160/320V 64KVA DRY TYPE TRANSFORMER T2-0090-03

POTTER & BRUMFIELD TRANSFORMER 120V 50/60HZ 10A KB23AG

SOLA CVS WAVE OUTPUT TRANSFORMER, 7500 VA, P/R 23-28-275-6