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【简答题】
刨床工作台往返PLC控制系统的设计、安装及调试的控制要求如下: 1 按下前进按钮工作台快速前进,同时刀架放下开始工件切削加工; 2 当工作台快速前进时,档铁2止SP3时,工作台由快速变为慢速继续前进,直至档铁2至SP4时工作台停止; 3 5s后工作台快速后退,同时刀架电磁铁动作抬起刀架,使刀不能接触加工件; 4 当工作台快速后退时,档铁1止SP2时,工作台由快速变为慢速继续后退,直至档铁1至SP1工作台停止; 5 5s后工作台继续快速前进,同时刀架放下开始工件切削加工,如此往返动作; 6 按下停止按钮工作台必须立即停止。 请根据控制要求设计: 1I/O分配表; 2程序; 3外部接线图。
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