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2025-04-30 23:13 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 s 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。 control system principleAutomatic washing machine water, laundry, drainage, dehydration is through the water level switch, electromagnetic inlet valve and electromagnetic drain valve with the control, so as to realize automatic control, water level switch is used to control the water washing machine in low high school level, electromagnetic inlet valve plays the role of water on and off. Water, electromagnetic inlet valve open, water injection, drainage, electromagnetic drain valve open, will draw out, laundry, wash motor startup, dehydration, to take off the bucket start.四、The fourth chapter hardware circuit design system selection(1) IO points statistics:The I/O points are PLTimer/counter: 2 b/aAnalog quantity: 100150 b/aCommunication interface: a interface general need 300 b aboveAccording to the above figure out the total number of bytes to consider increase 25% spare capacity, can estimate the user program memory capacity, so as to choose appropriate PLC memory. The system has 11 digital input point 6 digital output point, need to memory 280 b, a timer six, timer 2, need to memory and b, consider allowance needs after memory 370 b.(2) CPU function and structure choiceThe function of PLC increasingly powerful, general PLC has the switch quantity logic, timing, counting, data processing and other basic functions, some PLC can also
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