ntheotheroperationmodesbeimplemented.Thenextisfire-protectionmode,theelevatormustreturntothebottomfloororbasestationimmediatelywhenthefireswitchacts.Theelevatorshouldturntonormaloperationmodewhenthefireswitchisreset.Undernormaloperationmode,thecontrolsystem’sbasictaskistocommandeachelevatortomoveupordown,tostoporstartandtoopenandclosethedoor.Butishassomeconstraintsasfollows:Eachelevatorhasasetofbuttonsonthecarcontrolpanel,oneforeachfloor.Thesebuttonsilluminatewhentheyarepressedandcausetheelevatortovisitthecorrespondingfloor.Theilluminationiscanceledwhenthecorrespondingfloorisvisitedbytheelevator.Eachfloor,exceptthefirstandthetopfloor,hastwobuttonsonthefloorcontrolpanel,onetorequestanup-elevator,onetorequestadown-elevator.Thesebuttonsilluminatewhentheyarepressed.Theilluminationiscanceledwhenanelevatorvisitsthefloor,thenmovesinthedesiredd筑如在午餐时间办公楼。
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