專業(yè)英語項目作業(yè)(存儲版)
【正文】 ely with the corresponding button switch to control. Fully automatic washing machine, and the four process can be done in fully automatic operation, until the end of laundry. equipment control requirementsFully automatic washing machine control requirements are can realize normal operation and forced to stop two control requirements.(1) press the start button, and began to fill with water until (. the water reaches a high water level) to stop water to start washing are turning(2) when catharsis, are turning 30 seconds, stop two seconds, then reverse 30 seconds, stop for 2 seconds(3) so cycle 5 times, a total of 320 seconds began to drainage(4) drop in the water level to the low water level at the start of dehydration and continue to drainage, dehydration 30 seconds[5] start cleaning, repeat (1) to (4), cleaning twice[6] clean finish, alarm 3 seconds and automatic stopIf the meantime press drainage button can realize manual drainageIf stuff press the stop button, can realize manual stop water, dewatering and alarm三、The third chapter, the design of control system control system block diagramFigure 1 system block diagram control system corresponding equipment and realization functionThe corresponding external equipment start button to stop button water selector switch (high level) water selector switch (water) water selector switch (low water level) manual drainage switch manual dehydration switch high water level ball float switch in water level ball float switch low water ball float switch water emptying ball float switchThe corresponding output equipment intake solenoid valve discharge solenoid valve washing motor are turning relay washing motor reversal relay to take off the bucket alarm。全自動洗衣機(jī)中，這四個過程可做到全自動依次運行，直至洗衣結(jié)束。在洗衣機(jī)控制方面，在PLC問世之前，工業(yè)控制領(lǐng)域中是繼電器占主導(dǎo)地位。由于每遍的洗滌,排水,脫水的時間由PLC內(nèi)計數(shù)器控制,所以只要改變計數(shù)器參數(shù)就可以改變時間。PLC的 優(yōu)點是：可靠性高，耗電少，適應(yīng)性強(qiáng)，運行速度快，壽命長等，為了進(jìn)一步提高全自動洗衣機(jī)的功能和性能，避免傳統(tǒng)控制的一些弊端，就提出了用PLC來控制全自動洗衣機(jī)這個課題。該系統(tǒng)有11個數(shù)字輸入點6個數(shù)字輸出點，需內(nèi)存280B，有定時器6個，計時器2個，需內(nèi)存16B，考慮余量后需要內(nèi)存370B。t munication.3. Free munication port means: is a very distinctive function. S7200 PLC can with any munication protocol open other equipment munication. That can be defined by the user to munication protocols. Baud rate highest kbit/s.4. Profibusdp network: CPU222, 224 xp, 226 can be EM277 by increasing the method supports PROFIBUS DP network protocol. The highest transmission rate for 12 mbit/s. EEPROM memory module (option)Can be used as a modification with
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