1764-28BXB
1764-28BXB
今天,我們班zui漂亮的女同學(xué)結(jié)婚了! 想當(dāng)初,我追了她三年,有一天她給我發(fā)了一段英文(If you never abandon,I will in life and death ),我英語(yǔ)不行,就找同桌翻譯,同桌說(shuō)是: 要不 你離開(kāi)我,要不 我和你同歸于盡! 我當(dāng)時(shí)就傷心欲絕,從此以后再?zèng)]有她。直到今天,婚禮現(xiàn)場(chǎng)巨大的銀屏上又是寫(xiě)著那段英文!要命的是今天我才知道那句話是: 你若不離不棄,我必生死相依! 而新郎就是當(dāng)年給我翻譯的那位同桌!
失敗的原因:沒(méi)有問(wèn)對(duì)人! 所以買產(chǎn)品找對(duì)人很重要,別到處瞎打聽(tīng),一定要問(wèn)對(duì)人才能買到真正優(yōu)惠的自動(dòng)化產(chǎn)品!
:祖巧麗
:
為了提高PLC控制系統(tǒng)工作的可靠性,可以專門(mén)設(shè)置一個(gè)定時(shí)器,作為監(jiān)控程序部分,對(duì)系統(tǒng)的運(yùn)行狀態(tài)進(jìn)行檢測(cè)。若程序運(yùn)行能正常結(jié)束,則該定時(shí)器就立即被清零;若程序運(yùn)行發(fā)生故障,如出現(xiàn)死循環(huán)等,該定時(shí)器在設(shè)定的時(shí)間到就無(wú)法清零,此時(shí)PLC發(fā)出報(bào)警信號(hào)。在設(shè)計(jì)應(yīng)用程序時(shí),使用這種方法來(lái)實(shí)現(xiàn)對(duì)系統(tǒng)各部分運(yùn)行狀態(tài)的監(jiān)控。如果用PLC來(lái)控制某一對(duì)象時(shí),編制程序時(shí)可定義一個(gè)定時(shí)器來(lái)對(duì)這一對(duì)象的運(yùn)行狀態(tài)進(jìn)行監(jiān)視:該定時(shí)器的設(shè)定時(shí)間即為這一對(duì)象工作所需的zui大時(shí)間;當(dāng)啟動(dòng)該對(duì)象運(yùn)行時(shí),同時(shí)也啟動(dòng)該定時(shí)器。若該對(duì)象的運(yùn)行程序在規(guī)定的時(shí)間結(jié)束工作,發(fā)出一個(gè)工作完成信號(hào),使該定時(shí)器清零,說(shuō)明這一對(duì)象的運(yùn)行程序正常;否則,屬運(yùn)行不正常,發(fā)出報(bào)警信號(hào)或停機(jī)信號(hào)。監(jiān)控程序的梯形圖如圖7所示。圖7中定時(shí)器T1為檢測(cè)元件,X001為控制對(duì)象動(dòng)作信號(hào),X002為動(dòng)作完成信號(hào),M2為報(bào)警或停機(jī)信號(hào)。假設(shè)被控對(duì)象的運(yùn)行程序完成一次循環(huán)需要50s,則定時(shí)器K值可取510(T1為100ms定時(shí)器)。當(dāng)X001=1時(shí),被控對(duì)象運(yùn)行開(kāi)始,T1開(kāi)始計(jì)時(shí);如在規(guī)定的時(shí)間內(nèi)被控對(duì)象的運(yùn)行程序能正常結(jié)束,則X002動(dòng)作,M1復(fù)位,定時(shí)器T1被清零,等待下一次循環(huán)的開(kāi)始;若在規(guī)定時(shí)間沒(méi)有發(fā)出被控對(duì)象運(yùn)行完成的動(dòng)作信號(hào),則判斷為故障,T1的觸點(diǎn)閉合,接通M2發(fā)出報(bào)警信號(hào)或停機(jī)信號(hào)。
NUMATICS ACTUATOR PNEUMATIC VALVE REPAIR KIT, N98-2190 *NEW*
SMC 24VDC DOUBLE SOLENOID VALVE VQ7-6-FG-D-3Z
SMC 0.2-1.0MPA SOLENID VALVE VQ7-6-FJG-D-3ZR
KUNKLE VALVE DIVISION 50 PSIG 1-1/2" NPT RELIEF VALVE, 537-G01-HM *NEW*
INLINE INDUSTRIES 1000WOG 3/8" SS BALL VALVE CF8M
TRANSPAK 3-15PSIG 4-20MA 10-90V 1/4" SOLENOID VALVE TP690-001 105402
JAMESBURY INC. SEAL REPAIR KIT RKF5TT NIB
VELAN 1" 1975PSIG@100°F MODEL-A GLOBE VALVE A105N / S-2074B-02TY
FESTO CPV10-VI M302 CPV10-GE-ASI-8E?8A-Z-M8 MANIFOLD W/ (1) 185 880 R302
FESTO CPV10-VI M302 CPV10-GE-ASI-8E?8A-Z-M8 MANIFOLD W/ (1) 185 880 R202
MANNESMANN REXROTH 4WE10D31/CG24N9?Z55L SOLENOID VALVE
VICKERS DIRECTIONAL SOLENOID CONTROL VALVE DG4V-3-23A-M-P7?-H-7-52
LADISH 3/4" 150 DIRECTIONAL VALVE 0701-314
SMC 0-1.0MPA 24VDC 2-POSITION SINGLE VALVE MANIFOLD, VQC4101R-5 *NEW*
ITT FABRI-VALVE 150 CWP S316 8" KNIFE GATE VALVE F440732
RELIANCE P18G4059C FRAME 184TC 3PH 230/460V 3500RPM 5HP MOTOR 01BG96507401G 1 XY
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ALCO CONTROLS 120V 17/12W SOLENOID VALVE COIL 023-0039-01 *NEW*
REXROTH HYDRAULIC DIRECTIONAL VALVE Z4WE 6 W68-30/EG24K4/V
RUGGLES-KLINGEM?ANN 1/2" SOLENOID VALVE 229-A
FESTO CPV10-VI U502 CPV10-GE-ASI-8E?8A-Z-M8 MANIFOLD W/ (5) 161 368 U402
FESTO CPV10-VI U202 CPV10-GE-ASI-8E?8A-Z-M8 MANIFOLD W/ (5) 161 368 TD02
FESTO CPV10-VI M302 CPV10-GE-ASI-8E?8A-Z-M8 MANIFOLD W/ (2) 185 880 L702
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NIBCO BRONZE BALL VALVE, ? TURN ?" NPT END CONNECTION, NEW
SIZE 3 CLASS 150 SS316 KNIFE VALVE L10-0320C-13BL