CI810A

CI810A

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為了便于編制PLC程序，多數(shù)PLC廠家都開發(fā)有關(guān)計(jì)算機(jī)支持軟件。

從本質(zhì)上講，PLC所能識(shí)別的只是機(jī)器語言。它之所以能使用一些助記符語言、梯形圖語言、流程圖語言，以至高級(jí)語言，全靠為使用這些語言而開發(fā)的種種軟件。

助記符語言是zui基本也是zui簡(jiǎn)單的PLC語言。它類似計(jì)算機(jī)的匯編語言，PLC的指令系統(tǒng)就是用這種語言表達(dá)的。這種語言僅使用文字符號(hào)，所使用的編程工具簡(jiǎn)單，用簡(jiǎn)易編程器即可。所以，多數(shù)PLC都配備有這種語言。

梯形圖語言是圖形語言，它用類似于繼電器電路圖的符號(hào)表達(dá)PLC實(shí)現(xiàn)控制的邏輯關(guān)系。這種語言與符號(hào)語言有對(duì)應(yīng)關(guān)系，很容易互相轉(zhuǎn)換，并便于電氣工程師了解與熟悉，故用得很普遍，幾乎所有的PLC都開發(fā)有這種語言。由于它是用圖形表達(dá)，小的編程器不好使用它，得有較大的液晶畫面的編程器，才能使用它。多數(shù)是在計(jì)算機(jī)對(duì)PLC編程時(shí)，才使用這種語言。

流程圖語言，它也是圖形語言，不過所用的符號(hào)不與電氣元件符號(hào)相似，而與計(jì)算機(jī)用的流程圖符號(hào)相似，便干計(jì)算機(jī)工作人員了解與熟悉。流程圖語言與符號(hào)語言也有一一對(duì)應(yīng)關(guān)系，只是它對(duì)應(yīng)的符號(hào)語言與梯形圖的對(duì)應(yīng)不一樣。熟悉計(jì)算機(jī)而又未從事過一般電氣工作的人員，樂于用這種語言對(duì)PLC編程。日本OMRON公司開發(fā)的F系列機(jī)就是使用這種語言。

梯形圖與流程圖混合語言。這種語言，梯形圖與流程圖兩者兼用，可使PLC程序結(jié)構(gòu)化。它用流程圖把PLC程序劃分成若干結(jié)構(gòu)塊，并規(guī)范塊間的邏輯。用梯形圖再確定塊中的種種量間的邏輯關(guān)系。這種混合語言有不同的實(shí)現(xiàn)方法，而且多用于大型的PLC的編程

高級(jí)語言，PLC編程也可以使用高級(jí)語言，如BASIC、C語言等。可以在DOS，也可在WINDOWS平臺(tái)上運(yùn)行。關(guān)鍵在于要把用高級(jí)語言編寫的程序轉(zhuǎn)換成助記符語言，或直接轉(zhuǎn)換成PLC所能識(shí)別的機(jī)器語言。從根本上講，只要能實(shí)現(xiàn)這個(gè)轉(zhuǎn)換的，什么高級(jí)語言都可以。而編寫這個(gè)轉(zhuǎn)換的軟件工作量很大，當(dāng)然應(yīng)由有關(guān)廠家開發(fā)與提供。當(dāng)前不少PLC廠家已有提供。如GE－FANAC的PLC就提供有可用C語言編程的軟件。

再前進(jìn)一步，從理論上講使用自然語言編程也是*可能的。只是要下力氣去開發(fā)，以及市場(chǎng)有這個(gè)需要。

支持軟件不僅編制PLC程序需要，監(jiān)控PLC運(yùn)行，特別是監(jiān)視PLC所控制的系統(tǒng)的工作狀況也需要。所以，多數(shù)支持編程的軟件，也具有監(jiān)視PLC工作的功能。

此外，也有于監(jiān)控PLC工作的軟件，它多與PLC的監(jiān)視終端連用。

有的PLC廠家或第三方廠家還開發(fā)了使用PLC的組態(tài)軟件，用以實(shí)現(xiàn)計(jì)算機(jī)對(duì)PLC控制系統(tǒng)監(jiān)控，以及與PLC交換數(shù)據(jù)。

PLC的用戶也可基于DOS或WINDOWS平臺(tái)開發(fā)用于PLC控制系統(tǒng)的應(yīng)用軟件，以提高PLC系統(tǒng)自動(dòng)化及智能化水平。這方面的軟件已日益受到重視。

總之，為了用好PLC，PLC的支持軟件越來越豐富，性能也越來越好，其界面也越來越友好，也因此，它的情況如何，已成為評(píng)判PLC性能的指標(biāo)之一。

5.7可靠控制

為使PLC能可靠工作，在硬件與軟件兩個(gè)方面PLC廠家都采取了很多措施，對(duì)一些特殊可靠要求的PLC，還有相應(yīng)的特殊的措施，如熱備、冗余等等。這在介紹PLC的特點(diǎn)時(shí)已作了敘述。可靠措施的目的是增加PLC平均故障間隔時(shí)間、MTBF（MeanTimeBetweenFailure）及減少PLC的平均修復(fù)時(shí)間、MTTR（MeanTimeToRepair），以提高PLC的有效度A（Availability）。

A=MTBF/(MTBF+MTTR)

式中A--有效率

MTBF--平均故障間隔時(shí)間

MTTR--平均修復(fù)時(shí)間

當(dāng)然，A值越大越好，它可使PLC系統(tǒng)得到充分的利用，是為什么要使用PLC的重要指標(biāo)。而從上式可知，MTBF越大，MTTR越小，則A越大。所以，PLC的可靠措施都是圍繞提高MTBF及MTTR值進(jìn)行的。

鑒于可靠工作是PLC的重要特點(diǎn)，至關(guān)重要，故有關(guān)提高MTBF及降低MTTR的措施如何，以及PLC的MTBF與MTTR值也成為PLC性能的重要指標(biāo)。

YUKEN HYDRAULIC CYLINDER CJT70-FA40B30B-?AB

YUKEN HYDRAULIC CYLINDER CJT70-FA32D25D-?ABD-EK

YUKEN HYDRAULIC CYLINDER CJT70-FA32B110B?-ACC-EK

YUKEN HYDRAULIC CYLINDERCJT70-L?A40B90B-BDA-E

YUKEN HYDRAULIC CYLINDER CJT70-FA32B70B-?ABB-EK

YUKEN HYDRAULIC CYLINDER CJT70-FA40B450B?-ABD-EK

PARKER HANNIFIN CB152HL001 CYLINDER BODY SEAL KIT NIB

FESTO 40MM BORE 150MM STROKE PNEUMATIC CYLINDER, ADVU-40-150-PA, NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA32B210B?-BAD 20

YUKEN HYDRAULIC CYLINDER CJT70-BA40B145B?-ABD

YUKEN HYDRAULIC CYLINDER CJT70-LB40B85B-?BAD-EK

SMC HYDRAULIC CYLINDER T-CHDMC25-75-K5?9W

YUKEN HYDRAULIC CYLINDER CJT70-FA63C280N?-BNC

SMC HYDRAULIC CYLINDER CHDQB40-30DM-J7?9WL ZS

YUKEN HYDRAULIC CYLINDER CJT70-FA80B40N-?AN

YUKEN HYDRAULIC CYLINDER CJT70-FA80C 28N-BNB

TOYODA MACHINE HYDRAULIC CYLINDER HC-40CB215-W-L

YUKEN HYDRAULIC CYLINDER CJT70-LA32B90B-?ABA-E

YUKEN HYDRAULIC CYLINDER CJT70-LA 50B 65B-ABD

FESTO VMPA-CPI-EPL-GU INTERNAL PILOT AIR SILENCER W/ FIELD BUS INTERFACE

ROSS 2771B4005 110/120 VOLTS 50/60 HERTZ PNEUMATIC VALVE

FESTO PNEUMATIC CYLINDER DNGU-80-430-PPV?-A

FESTO 145PSI PNEUMATIC CYLINDER DNC-32-300-PPV-?A-KP NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA40B80B-?CAA-EK 20A

YUKEN HYDRAULIC CYLINDER CJT70-TC40B370B?-ADD-EK 20A

YUKEN HYDRAULIC CYLINDER CJT70-TC40B415B?-ADD-EK 20A

YUKEN HYDRAULIC CYLINDER CJT70-FA32B350B?-ABD-EK 20A

YUKEN HYDRAULIC CYLINDER CJT70-FA40B100N?-AND-EK

FESTO 40MM BORE 450MM STROKE PNEUMATIC CYLINDER, DNC-40-450-PPV-?A, NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA32B375B?-BCD-EK 20A

YUKEN 20 HYDRAULIC CYLINDER PAZ-0228 / CJT70-FA32B700B?-ABD

MAC 0-150 PSI PRESSURE REGULATOR VALVE, PR63D-11BA *NIB*

FESTO PNEUMATIC CYLINDER DKE-63-340-PPV-?A

FESTO 32MM BORE 240MM STROKE PNEUMATIC CYLINDER, DNU-32-240-PPV-?A, NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA32B50B-?ABD-EK 20A

YUKEN HYDRAULIC CYLINDER CJT70-FA63B65B-?ABC 20A

YUKEN HYDRAULIC CYLINDER CJT70-FA32B220B?-DAA-EK 20A

PARKER SER.HD 3000PSI HYDRAULIC CYLINDER 01.50 CJHDLTV142AC 2.000

STANLEY AIR TOOLS PNEUMATIC NUTRUNNER NO LABEL

SMC PNEUMATIC CYLINDER 63MM BORE 125MM STROKE CDQ2463-125DCM-?A93L

YUKEN HYDRAULIC CYLINDER CJT70-FA50B80B-?CBA-EN

BARCO ROTARY UNION BC-54924-06-06 NIB

NUMATICS 120V, 50/60HZ, 0.36A SOLENOID VALVE WITH MANIFOLD 33DSA4410

YUKEN HYDRAULIC CYLINDER CJT70-FA32B80B-?ABD-EK

YUKEN HYDRAULIC CYLINDER CJT70-A80B30B ABD

YUKEN HYDRAULIC CYLINDER CJT70-FA80B90B-?BAD

YUKEN HYDRAULIC CYLINDER CJT70-A80B90B-B?AD

YUKEN HYDRAULIC CYLINDER CJT70-TC40B175B?-ADA-EK

YUKEN HYDRAULIC CYLINDER CJT70-FA40B115B?-CAA-EK

YUKEN HYDRAULIC CYLINDER CJT70-FA32B60B-?ABD

YUKEN HYDRAULIC CYLINDER CJT70-LA32B85B-?ABD

LENZ * UNION FITTING * UNKNOWN

MAC PNEUMATIC SOLENOID VALVE 6336D-000-PM-11?1DA

FESTO 40MM BORE 280MM STROKE PNEUMATIC CYLINDER DKE-40-280-PPV-?A

DIXON BOSS PNEUMATIC REGULATOR AIR COMPRESSOR R30-06R NNB

FESTO 80MM BORE 80MM STROKE PNEUMATIC CYLINDER, DNC-80-80-PPV-A?, NNB

PARKER SERIES VE HYDRAULIC CYLINDER 06.00 TBVELUS14A 12.750

YUKEN HYDRAULIC CYLINDER CJT70-CB40B175B?-ABB

YUKEN HYDRAULIC CYLINDER CJT70-FA32B274B?-ABD

YUKEN HYDRAULIC CYLINDER CJT70-FA80B30B-?ABD

TOYOOKI HYDRAULIC CYLINDER TFA-SA IFA40B70B30DBA

YUKEN HYDRAULIC CYLINDER CJT70-FA80C145B?-ABD

YUKEN HYDRAULIC CYLINDER CJT70-FA40B30B-?AB

YUKEN HYDRAULIC CYLINDER CJT70-FA32D25D-?ABD-EK

YUKEN HYDRAULIC CYLINDER CJT70-FA32B110B?-ACC-EK

YUKEN HYDRAULIC CYLINDERCJT70-L?A40B90B-BDA-E

YUKEN HYDRAULIC CYLINDER CJT70-FA32B70B-?ABB-EK

YUKEN HYDRAULIC CYLINDER CJT70-FA40B450B?-ABD-EK

PARKER HANNIFIN CB152HL001 CYLINDER BODY SEAL KIT NIB

FESTO 40MM BORE 150MM STROKE PNEUMATIC CYLINDER, ADVU-40-150-PA, NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA32B210B?-BAD 20

YUKEN HYDRAULIC CYLINDER CJT70-BA40B145B?-ABD

YUKEN HYDRAULIC CYLINDER CJT70-LB40B85B-?BAD-EK

SMC HYDRAULIC CYLINDER T-CHDMC25-75-K5?9W

YUKEN HYDRAULIC CYLINDER CJT70-FA63C280N?-BNC

SMC HYDRAULIC CYLINDER CHDQB40-30DM-J7?9WL ZS

YUKEN HYDRAULIC CYLINDER CJT70-FA80B40N-?AN

YUKEN HYDRAULIC CYLINDER CJT70-FA80C 28N-BNB

TOYODA MACHINE HYDRAULIC CYLINDER HC-40CB215-W-L

YUKEN HYDRAULIC CYLINDER CJT70-LA32B90B-?ABA-E

YUKEN HYDRAULIC CYLINDER CJT70-LA 50B 65B-ABD

FESTO VMPA-CPI-EPL-GU INTERNAL PILOT AIR SILENCER W/ FIELD BUS INTERFACE

ROSS 2771B4005 110/120 VOLTS 50/60 HERTZ PNEUMATIC VALVE

FESTO PNEUMATIC CYLINDER DNGU-80-430-PPV?-A

FESTO 145PSI PNEUMATIC CYLINDER DNC-32-300-PPV-?A-KP NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA40B80B-?CAA-EK 20A

YUKEN HYDRAULIC CYLINDER CJT70-TC40B370B?-ADD-EK 20A

YUKEN HYDRAULIC CYLINDER CJT70-TC40B415B?-ADD-EK 20A

YUKEN HYDRAULIC CYLINDER CJT70-FA32B350B?-ABD-EK 20A

YUKEN HYDRAULIC CYLINDER CJT70-FA40B100N?-AND-EK

FESTO 40MM BORE 450MM STROKE PNEUMATIC CYLINDER, DNC-40-450-PPV-?A, NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA32B375B?-BCD-EK 20A

YUKEN 20 HYDRAULIC CYLINDER PAZ-0228 / CJT70-FA32B700B?-ABD

MAC 0-150 PSI PRESSURE REGULATOR VALVE, PR63D-11BA *NIB*

FESTO PNEUMATIC CYLINDER DKE-63-340-PPV-?A

FESTO 32MM BORE 240MM STROKE PNEUMATIC CYLINDER, DNU-32-240-PPV-?A, NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA32B50B-?ABD-EK 20A

YUKEN HYDRAULIC CYLINDER CJT70-FA63B65B-?ABC 20A

YUKEN HYDRAULIC CYLINDER CJT70-FA32B220B?-DAA-EK 20A

PARKER SER.HD 3000PSI HYDRAULIC CYLINDER 01.50 CJHDLTV142AC 2.000

STANLEY AIR TOOLS PNEUMATIC NUTRUNNER NO LABEL

SMC PNEUMATIC CYLINDER 63MM BORE 125MM STROKE CDQ2463-125DCM-?A93L

YUKEN HYDRAULIC CYLINDER CJT70-FA50B80B-?CBA-EN

BARCO ROTARY UNION BC-54924-06-06 NIB

NUMATICS 120V, 50/60HZ, 0.36A SOLENOID VALVE WITH MANIFOLD 33DSA4410

FESTO CYLINDER ADVU-63-25-P-A

ARO FLUID POWER E712LS

SMC CYLINDER CLATN80-500-E

FESTO 174PSI, 25MM STROKE,ROUND CYLINDER DGS-25-25

PALL FILTER ELEMENT NNB HC8400FKN16H / TV20B 104870

FESTO PNEUMATIC CYLINDER DNG-40-100-PPV-?A NNB

FESTO PNEUMATIC CYLINDER DNG-50-40-PPV-A NNB

NUMATICS VOLTS/HZ: 120/50/60 AMPS .11 SOLENOID VALVE I23SS500K / 123SS500K

FESTO PNEUMATIC CYLINDER DNG-50-50-PPV-A

NUMATICS 0-15 PSI PRECISION REGULATOR R880-02BG

PARKER 150PSI PNEUMATIC LUBRICATOR 06L11BE

NUMATICS 150PSIG MAX SOLENOID VALVE WITH MANIFOLD 124BB515MP00061

NUMATICS 150 PSIG, 24V PNEUMATIC VALVE 13BB500MP00061

MOOG SERVO VALVE G761-3001 NIB

FLUITEK AIR FILTER A121129-C NIB

NUMATICS 120V, 50/60HZ, 0.08 AMPS SOLENOID VALVE W/ MANIFOLD 152SA425K

BTM FINGER CLAMP NIB 756900C-RSPTDC

HCI-XD CYLINDER 40X460-FA

NUMATICS 24VDC 4.0W 14.5-232 PSIG-AIR SOLENOID VALVE, I22BB500R061D61

NUMATICS NPTF 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I23BB500MP14X61 NIB

NUMATICS 120V .24A 280 PSIG-AIR SOLENOID VALVE W/ BASE, I35SS73BK

BAILEY BABCOCK & WILCOX PNEUMATIC FUNCTION GENERATOR FG111

NUMATICS 150PSIG SOLENOID VALVE NNB I35SS43BK000030 101800

VICKERS VANE TYPE HYDRAULIC PUMP 4535V 60A 35

KYOHO56H40026 HCI-XD CYLINDER 40MM BORE 910MM STROKE 40X910-LB

YUKEN HYDRAULIC CYLINDER CJT70-FA 80C 65H-ABD

NUMATICS SOLENOID 225-372B, 24VDC 6.0 WATTS 26AMP, 150PDIG- AIR NNB

NUMATICS 123SS515K 120 VOLTS 50/60 HERTZ 150 PSIG DOUBLE SOLENOID VALVE

STAFSJO KNIFE GATE VALVE W/ PNEUMATIC ACTUATOR AC-160 102573

CAT PUMPS GENUINE PARTS CONNECTION ROD 121467 NIB

NUMATICS 120V .12A 150 PSIG-AIR SOLENOID VALVE W/ BASE, 082SA415K

ENIDINE HYDRAULIC SHOCK ABSORBER MT 206313 NIB

MONITEUR * SENTINEL PNEUMATIC VALVE WITH PARTS * AMYB-5120

FESTO LINEAR CYLINDER DZH-50-100-PPV-?A

SMC 32MM BORE 30MM STROKE 0.7MPA PRECISION CYLINDER, MTS32-W2316-30

BIMBA SS PNEUMATIC CYLINDER 094-NRP

FESTO PNEUMATIC STANDARD CYLINDER DNG-100-25-PPV-?A NNB

SCHROEDER FILTER KW NIB

SMC PRESISION AIR PRESSURE REGULATOR AR20-01B

FESTO DZH-40-PPV-A CYLINDER REPLACEMENT PARTS NIB

WHITEY 200PSI SPRING RETURN W/ VALVE 133 SR

MAC AIR VALVE 56C-52-RA *MANUFACTURER REFURBISHED*

FESTO 63MM BORE 725MM STROKE PNEUMATIC CYLINDER, DGP-63-725-PPV-?A-B

GE CIRCUIT BOARD MODULE IC4215PB12 / IC3606TPAV1A1B 103451