鼎晟达自动化 RELIANCE ELECTRIC 0-51865-14

1：根据工程实际需求，进行功能块规划，编写子程序

   在PLC中子程序是为一些特定的控制目的编制的相对独立的程序。执行子程序调用指令CALL等，如果条件不满足子程序调用时,程序的扫描就仅在主程序中进行，不再去扫描这段子程序,这样就减少不必要的扫描时间。

   2：用字或双字数据传送给DO点方法来控制输出

   在PLC的应用中通常都会有大量的输出控制，用字或双字数据传送给DO点方法来控制输出可以提高速度，只要根据实际应用的要求，合理分配输出地址，变换控制输出控制字，可以大大减少PLC程序执行的步数，从而加快PLC的程序运行速度。

   3：脉冲触发SET、RESET

   PLC中，使用SET指令只执行一次即可，不必每次扫描都执行这个指令，很适合与脉冲输出(PLS/PLF)指令配合使用。有些工程人员忽视了这个问题，使用了常规的方法来驱动SET指令，无意中增加了PLC程序扫描运行时间.

   4：避免了类型转换，方法如下：

   以S7-200为例，它的内存格式与我们常用的PC机正好相反，它是高字在前，低字在后的。所以我们可以将字变量放在后两个字节，在程序初始化时将前两个字节清零(程序的其它地方不得使用这两个字节)。

   如我们定义符号时将字变量定义在VW2，同时保持VW0的值为零。则程序中可以用VW2以字型访问该变量，同时也可以VD0以双字型访问，避免了类型转换。

   为了避免使用时混淆，最好以明确的符号定义来区分字类型和双字类型。在此强烈推荐类匈牙利命名法：以前缀指示变量类型，用首字母大写的有意义的英文单词的组合作变量名。本人习惯用以下缀：b----字节型变量(byte)

   w----字型变量(word)

   d----双字变量(double)

   r----实型变量(real)

   f----位变量(flag)

   btn---自复位按钮式输入(button)

   sw----切换开关或自锁按钮输入(switch)

   sig---传感器、编码等电平信号输入(signal)

   rly---输出继电器位(relay)

   ……

   当然，这个根据个人习惯来，没有定则，主要是利于自己区分。

   假如有一个字类型变量名为VarName，为使用前面的转换技巧，我们可以这样定义：

   wVarName----VW2

   dVarName----VD0

   在程序初始化时将VW0清零(如果是不需要记忆的变量，直接将dVarName清零也可)或者在数据块中将VW0设置为零。

则以后需要以字类型访问变量时就用wVarName，需要以双字类型访问变量时就用dVarName。完全不需要类型转换。

   本方法可以极大的减少程序语句数，使程序更简洁、可读性更好，由于不需要做耗时的类型转换，程序运行效率也得到提高。且数学运算量越大，效率提高越明显。

   缺点是要多占用两字节的内存，以后程序中不能使用VW0。但S7-200的RAM空间很大，一般是用不完的，以226为例，有多达10K的RAM，偶从来没有超过1K。这些RAM都是花钱买来的，不用白不用，不用也是浪费了。

   同理，如果有字节型变量经常需要与字类型变量相互转换，让字节变量占用一个字的内存宽度浪费一个字节，避免类型转换。

   关于第3点"使用SET指令只执行一次即可，不必每次扫描都执行这个指令,有些工程人员忽视了这个问题，使用了常规的方法来驱动SET指令，无意中增加了PLC程序扫描运行时间"不是很理解,能不能说得细一点。

   1：如果在ob里编写子程序段，是扫描的，但是如果您编写为FC调用，那么在FC的调用条件没有满足时，FC中的程序暂时不执行。这也是我所说节省时间的意思。

   2：PLC的执行步数根据程序长短会不同，扫描时间会根据执行步数的不同而不同，如果用一个mov指令完成8个数字量输出的控制，当然比用8个mov指令完成8个数字量输出的控制所需要的程序步数少。

   4：避免了类型转换，方法如下：

   以S7-200为例，它的内存格式与我们常用的PC机正好相反，它是高字在前，低字在后的。所以我们可以将字变量放在后两个字节，在程序初始化时将前两个字节清零(程序的其它地方不得使用这两个字节)。

   如我们定义符号时将字变量定义在VW2，同时保持VW0的值为零。则程序中可以用VW2以字型访问该变量，同时也可以VD0以双字型访问，避免了类型转换。

   为了避免使用时混淆，最好以明确的符号定义来区分字类型和双字类型。在此强烈推荐类匈牙利命名法：以前缀指示变量类型，用首字母大写的有意义的英文单词的组合作变量名。本人习惯用以下缀：b----字节型变量(byte)

   w----字型变量(word)

   d----双字变量(double)

   r----实型变量(real)

   f----位变量(flag)

   btn---自复位按钮式输入(button)

   sw----切换开关或自锁按钮输入(switch)

   sig---传感器、编码等电平信号输入(signal)

   rly---输出继电器位(relay)

   ……

当然，这个根据个人习惯来，没有定则，主要是利于自己区分。

   假如有一个字类型变量名为VarName，为使用前面的转换技巧，我们可以这样定义：

   wVarName----VW2

   dVarName----VD0

   在程序初始化时将VW0清零(如果是不需要记忆的变量，直接将dVarName清零也可)或者在数据块中将VW0设置为零。则以后需要以字类型访问变量时就用wVarName，需要以双字类型访问变量时就用dVarName。完全不需要类型转换。

   本方法可以极大的减少程序语句数，使程序更简洁、可读性更好，由于不需要做耗时的类型转换，程序运行效率也得到提高。且数学运算量越大，效率提高越明显。

   缺点是要多占用两字节的内存，以后程序中不能使用VW0。但S7-200的RAM空间很大，一般是用不完的，以226为例，有多达10K的RAM，偶从来没有超过1K。这些RAM都是花钱买来的，不用白不用，不用也是浪费了。

   同理，如果有字节型变量经常需要与字类型变量相互转换，让字节变量占用一个字的内存宽度浪费一个字节，避免类型转换。

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漳州鼎晟达自动化设备有限公司      

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CUTLER HAMMER 9441H361B NSPP 9441H361B

CUTLER HAMMER 10316H-1665A NSPP 10316H1665A

CUTLER HAMMER EHD3030LA01S17 USPP EHD3030LA01S17

CUTLER HAMMER 9441H284 NSFP 9441H284

Cutler Hammer 8RBA4DH NSNP **GENUINE** Westinghouse

CUTLER HAMMER D320TC800 USPP D320TC800

CUTLER HAMMER XTP-E032DCS FNFP XTPE032DCS

Cutler Hammer SNT1LP12K NSFP **GENUINE** Eaton Westinghouse

Cutler Hammer SNT1RP08K  NSFP **GENUINE** SNT1RP08K  Eaton Westinghouse

CUTLER HAMMER FD3030VL 30AMP CIRCUIT BREAKER *NEW IN BOX*

CUTLER HAMMER C323CM3T NSFP C323CM3T

CUTLER HAMMER D100CR14 USPP D100CR14

CUTLER HAMMER CP01471 FNFP CP01471

CUTLER HAMMER HMCP400X5WS10 USPP HMCP400X5WS10

CUTLER-HAMMER AF93AG0C010D Adjustable Frequency Drive

CUTLER HAMMER  * DIGITRIP RMS/R 810 TRIP UNIT * 7801C48G06

CUTLER HAMMER FDB14K NSPP FDB14K

CUTLER HAMMER 051473625592 NSFP 051473625592

CUTLER HAMMER 8793C-15G01 USPP 8793C15G01

Cutler Hammer C80DG1 NSNP **GENUINE** Eaton Westinghouse

Cutler Hammer 994112 NSNP **GENUINE** 9-941-12 Eaton Westinghouse

Cutler Hammer 99415 NSNP **GENUINE** 9 941 5 Eaton Westinghouse

CUTLER HAMMER C25HNE31201W USPP C25HNE31201W

Cutler Hammer 655D555G05 NSFP **GENUINE** Westinghouse

CUTLER HAMMER 28UT3900 USPP 28UT3900

Cutler Hammer Eaton CN15GN3ABT16 NSFP **GENUINE** Westinghouse CH C15GN 3ABT 16

CUTLER HAMMER KDL3250F3 USPP KDL3250F3

CUTLER HAMMER CP01268 NSFP CP01268

Cutler Hammer E20Y04C12 NSNP **GENUINE** Eaton Westinghouse

Cutler Hammer Eaton C50CN3A NSFP **GENUINE** Westinghouse CH C50C N3A

Cutler Hammer 2050A14G10 NSFP **GENUINE** 2050A 14G10 Eaton Westinghouse

CUTLER HAMMER 54A9935H12 USPP 54A9935H12

CUTLER HAMMER 2C12494G04 NSPP 2C12494G04

CUTLER HAMMER BA43P USPP BA43P

CUTLER HAMMER E2F100KMA02U62 NSFP E2F100KMA02U62

CUTLER HAMMER CE15KN3BB USPP CE15KN3BB

CUTLER HAMMER 9-1688-2 USPP 916882

CUTLER HAMMER 1A33594G05 NSFP 1A33594G05

CUTLER HAMMER KD2400F USPP KD2400F

CUTLER HAMMER 1553-3 USPP 15533

CUTLER HAMMER 477B477G05 NSFP 477B477G05

CUTLER HAMMER W200MLCNC NSPP W200MLCNC

CUTLER HAMMER LT2500T USPP LT2500T

Cutler Hammer HMCP100R3C NSFP **GENUINE** Westinghouse

Cutler Hammer Eaton 915491 NSFP **GENUINE** Westinghouse CH 9 1549 1

CUTLER HAMMER 2608D-25G03R USPP 2608D25G03R

Cutler Hammer SNT3P06K / 6642C88G22 NSNP **GENUINE** Westinghouse

CUTLER HAMMER S10N06P02P NSPP S10N06P02P

Cutler Hammer SNT3P11K NSFP **GENUINE** Westinghouse

CUTLER HAMMER LWPQ2036 NSFP LWPQ2036

NEW CUTLER HAMMER AE16EN0BC STARTER SIZE E SER.C1

CUTLER HAMMER D100-ERA8 NSPP D100ERA8

CUTLER HAMMER D5-20TT1 USPP D520TT1

CUTLER HAMMER CHSPT2ULTRA NSFP CHSPT2ULTRA

CUTLER-HAMMER CONTROL BOARD 42-13820-03 *NEW*

Cutler Hammer Eaton 5ACLS6R NSFP **GENUINE** Westinghouse CH 5ACLS 6R

CUTLER HAMMER SNT4LP18K NSFP SNT4LP18K

CUTLER HAMMER E51-NLP2 NSFP E51NLP2

CUTLER HAMMER EHD3100KL USPP EHD3100KL

Cutler Hammer Eaton A200M1CAC NSFP **GENUINE** Westinghouse CH A200M 1CAC

EATON CUTLER HAMMER HMA3400T TRIP UNIT STYLE 371D371G29 400A

CUTLER HAMMER ECL03B2A4A USPP ECL03B2A4A

Cutler Hammer 5LCLS3R NSFP **GENUINE** Westinghouse

Cutler Hammer 676C546G17 NSFP **GENUINE** Westinghouse

Cutler Hammer 5LCLS4R NSFP **GENUINE** Westinghouse

Cutler Hammer 676C546G17 NSNP **GENUINE** Westinghouse

NIB EATON CUTLER-HAMMER 8173A-6507 PHOTOELECTRIC CONTROLLER-ANALOG 70 SERIES

Cutler Hammer 10370H244A NSNP **GENUINE** Westinghouse

Cutler Hammer HFD2020L NSFP **GENUINE** Eaton Westinghouse

Cutler Hammer Eaton F3S03C NSFP **GENUINE** Westinghouse CH F3S0 3C

CUTLER HAMMER 92-00329-06 NSPP 920032906

CUTLER HAMMER 92-00326-05 NSPP 920032605

CUTLER HAMMER C30EN3A USPP C30EN3A

CUTLER HAMMER FD3225L USPP FD3225L

CUTLER HAMMER C396C2A150SELAX NSFP C396C2A150SELAX

CUTLER HAMMER DIGITRIP RP6D08A080 CIRCUIT BREAKER TRIP UNIT 652LSI, 600A

Cutler Hammer JD3250K Molded Case Switch 250 Amps 600VAC

NEW CUTLER HAMMER FD3090VL CIRCUIT BREAKER SER. C, 90A, 600VAC, 3 POLE

CUTLER-HAMMER FC 3020 CIRCUIT BREAKER 20A *NEW IN BOX*

Cutler Hammer, IDT 40-13820-01 Panel Mate Interface H10 0411020-016 42-13820 NEW

MX-261 CUTLER HAMMER CIRCUIT BOARD 87-02008-01 MODEL:AB ACCELERATION

CUTLER HAMMER AE16DN0AC NSFP AE16DN0AC

Cutler-Hammer 87-02008-01 Interface Card - 870200801

Cutler Hammer E51NLC1 NSFP **GENUINE** Westinghouse

CUTLER HAMMER 6-25-2 NSFP 6252

CUTLER HAMMER HFD3090L NSPP HFD3090L

Cutler Hammer 10250T51 Contact Block 1 N.C. (Pack of 6)

CUTLER HAMMER C10EN0A USPP C10EN0A

Cutler Hammer Eaton E111D65X3N NSFP **GENUINE** Westinghouse CH E111D 65X 3N

Cutler Hammer C10EN3 NSNP **GENUINE** Westinghouse

CUTLER HAMMER D520TC1 USPP D520TC1

CUTLER HAMMER CE55FN3BB USPP CE55FN3BB

CUTLER HAMMER RLB NSPP RLB

Cutler Hammer ED-3100 Circuit Breaker 100 Amp 3 Pole 240 Vac ! NEW !

Cutler Hammer 579553 NSNP **GENUINE** 57 955 3 Westinghouse

CUTLER HAMMER HMCP050K2CA02 USPP HMCP050K2CA02

CUTLER HAMMER 92-00627-01/09-00216 USPP 9200627010900216

CUTLER HAMMER 15BA4-300E NSFP 15BA4300E

Cutler Hammer CN55DN3AB NSFP **GENUINE** Westinghouse

Cutler Hammer DH362NGK  NSNP **GENUINE** DH 362NGK Eaton Westinghouse

Cutler Hammer DH362NGK NSFP **GENUINE** DH 362NGK Westinghouse

CUTLER HAMMER PM5000-ACKIT NSFP PM5000ACKIT

Cutler Hammer 626B187G13 NSNP **GENUINE** Westinghouse

Cutler Hammer Eaton 626B187G13 NSFP **GENUINE** Westinghouse CH

Cutler Hammer 626B1B7G13 NSFP **GENUINE** Westinghouse

CUTLER HAMMER 4276 USPP 4276

Cutler Hammer 2CLE125E NSFP **GENUINE** 2CLE 125E Westinghouse

Cutler Hammer 2CLE125E NSNP **GENUINE** 2CLE 125E Westinghouse

CUTLER HAMMER C825HN10A USPP C825HN10A

CUTLER HAMMER A50CNOA NSFP A50CNOA

Cutler Hammer S20N11S02N NSFP **GENUINE** Eaton Westinghouse

CUTLER HAMMER EHD2010L NSPP EHD2010L

Cutler Hammer AGSHWCH120N05XC NSFP **GENUINE** Westinghouse

CUTLER HAMMER B100J0B NSFP B100J0B

CUTLER HAMMER AE56CN0AC USPP AE56CN0AC

CUTLER HAMMER JGS3225FAG USPP JGS3225FAG

CUTLER HAMMER C441DA USPP C441DA

CUTLER HAMMER N05NEXRM3A USPP N05NEXRM3A

CUTLER HAMMER 9441H347B NSFP 9441H347B

CUTLER HAMMER JT3175T USPP JT3175T

CUTLER HAMMER JT3225T USPP JT3225T

Cutler Hammer 4989C12A47 NSFP **GENUINE** Westinghouse

Cutler Hammer 7RBA4300E NSNP **GENUINE** Westinghouse

Cutler Hammer 310C095G17 NSNP **GENUINE** Westinghouse

Cutler Hammer 4989C12A47B NSNP **GENUINE** Westinghouse

CUTLER HAMMER UVH5LP08K NSFP UVH5LP08K

CUTLER HAMMER AE317YNS3T1 USPP AE317YNS3T1

Cutler Hammer UVH3LP08K  NSFP **GENUINE** UVH3LP08K  Eaton Westinghouse

CUTLER HAMMER 28UI2-600 USPP 28UI2600

CUTLER HAMMER 10316H-1056 USPP 10316H1056

CUTLER HAMMER W210MLCFC USPP W210MLCFC

CUTLER HAMMER CN55AN3AB NSPP CN55AN3AB

Cutler Hammer C300EN3  NSNP **GENUINE** C300 EN3  Eaton Westinghouse

CUTLER HAMMER F3S04 NSFP F3S04

CUTLER HAMMER AN56BN0AB NSFP AN56BN0AB

CUTLER HAMMER EHD3030A02 USPP EHD3030A02

CUTLER-HAMMER/WESTINGHOUSE 9969D92G01 COIL. NNB

CUTLER HAMMER C10EN3CU USPP C10EN3CU

CUTLER HAMMER JHMFS03 NSFP JHMFS03

CUTLER HAMMER 92-00836-01 USPP 920083601

CUTLER HAMMER IDT-40-13900-02 USPP IDT401390002

CUTLER HAMMER 10316H-284 USPP 10316H284

Cutler Hammer 1261B100 NSFP **GENUINE** 1261B 100 Eaton Westinghouse

CUTLER HAMMER ART-ON USPP ARTON

CUTLER HAMMER 511H1150-5 NSFP 511H11505

CUTLER HAMMER HMCP150T4C NSFP HMCP150T4C

Cutler-Hammer D100CRA14 Lifetime Warranty !!!

CUTLER HAMMER CCH3200 USPP CCH3200

Eaton Cutler Hammer D100H 40 I/O High-Speed Output Relay D100CRA40H

CUTLER HAMMER 10370H69 USPP 10370H69

CUTLER HAMMER ECC03C1A4A NSFP ECC03C1A4A

CUTLER HAMMER C10EN2BB USPP C10EN2BB

(A10) 1 Cutler Hammer D100CRA20A controller

CUTLER HAMMER EHD3030A01 USPP EHD3030A01

CUTLER HAMMER 9-494-5 USPP 94945

CUTLER HAMMER 1261B-100 NSFP 1261B100

CUTLER HAMMER F3S07C NSFP F3S07C

CUTLER HAMMER 69C2990G02 USPP 69C2990G02

CUTLER HAMMER 67C5040G05 USPP 67C5040G05

CUTLER HAMMER E51CNC1 NSFP E51CNC1

CUTLER HAMMER N101BS0G3A NSFP N101BS0G3A

CUTLER HAMMER 3BR4242L225 NSFP 3BR4242L225

CUTLER HAMMER D520BX2 USPP D520BX2

Cutler Hammer 1381B6501  NSFP **GENUINE** 1381B6501  Eaton Westinghouse

NEW CUTLER HAMMER A200M0CAC SIZE 0 STARTER MODEL J

CUTLER-HAMMER D120PM1WORD RAM MEMORY **

CUTLER HAMMER HFD3050L NSFP HFD3050L

Cutler Hammer 8881C6501 NSFP **GENUINE** 8881C 6501 Eaton Westinghouse

Cutler Hammer 1382B6501 NSFP **GENUINE** 1382B 6501 Eaton Westinghouse

Cutler Hammer Eaton 1382B6501 NSFP **GENUINE** Westinghouse CH 1382B 6501

CUTLER HAMMER ARD880L NSFP ARD880L

Cutler Hammer Eaton 6252 NSFP **GENUINE** Westinghouse CH 6 25 2

Cutler Hammer Eaton 6352 NSFP **GENUINE** Westinghouse CH

Cutler Hammer 6252 NSNP **GENUINE** 6 25 2 Westinghouse

CUTLER HAMMER BR3040B200RN NSFP BR3040B200RN

CUTLER HAMMER HKB3100T USPP HKB3100T

Cutler Hammer Eaton 400LAP10 NSFP **GENUINE** Westinghouse CH 400L AP10

Cutler Hammer Eaton 400LAP10 NSNP **GENUINE** Westinghouse CH 400L AP10

CUTLER HAMMER 6641C86G09 USPP 6641C86G09

CUTLER HAMMER BA43A NSFP BA43A

CUTLER HAMMER LSB360300E USPP LSB360300E

CUTLER HAMMER JW3200 USPP JW3200

Cutler Hammer 8880C6502  NSFP **GENUINE** 8880C6502  Eaton Westinghouse

CUTLER HAMMER AA43P NSFP AA43P

CUTLER HAMMER 6-43-6 NSFP 6436

CUTLER HAMMER 87-01465-01 NSFP 870146501

CUTLER HAMMER 72401H370 USPP 72401H370

CUTLER HAMMER 72401H371 USPP 72401H371

CUTLER HAMMER CN15GN3C NSFP CN15GN3C

CUTLER HAMMER D520TC2 USPP D520TC2

CUTLER HAMMER BR-4040B200 NSFP BR4040B200

Cutler Hammer Eaton programmable controller D100ACR20A - nib - 60 day warranty

Cutler Hammer Expandable Controller MPC1 MPC1C22

Cuttler Hammer BPONI Buffered PONI IPONI

CUTLER HAMMER EATON D100CRA28W 28 I/O Controller D100 CRA28W RM66 ROM EX2040RM66

NEW EATON CUTLER HAMMER 9-1585-2 OPERATING COIL 115V 915852

CUTLER HAMMER 2D66621G01 USPP 2D66621G01

Thomas & Betts FS340050A, Circuit Breaker, 50Amp 50a 50 amp 480V, Cutler Hammer

Cutler Hammer Panelmate 542V 500 92-01411-01

Cutler-Hammer, DH461UDK, Eaton Safety Switch Disconnect 30A 600V 4Pole NEW

CUTLER HAMMER D100-CRA14 NSFP D100CRA14

CUTLER HAMMER DRIVE SV9000 WITH MANUAL SV9060AP-5M0A30

(3) NEW CUTLER HAMMER 2066A10G48 SHUNT REPLACEMENT KIT SIZE 6, 1 POLE

Cutler-Hammer, 6-24-2, Contact Kit 3Pole Size 2 NEW

NEW CUTLER HAMMER DH362FD4WRK

CUTLER HAMMER BREAKER LS 360600A 600A A AMP 600Vac 3 POLE w/ 600A TRIP

CUTLER HAMMER DH422FGK NSFP DH422FGK Fusible RARE! 4 POLE NEW IN BOX

CUTLER HAMMER 10316H1237A **

CUTLER-HAMMER A10FNOCB **

CUTLER HAMMER AE16FN0 NEW MOTOR STARTER W/ C306DN3 AE16FN0

CUTLER-HAMMER TRIP UNIT MES3800LS (CHIPPED AS PICTURED) **

Eaton Cutler Hammer D100CR14 D100 Controller

CUTLER HAMMER CA3200S3 USPP CA3200S3

CUTLER HAMMER 9441H284 NSPP 9441H284