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在实际使用中,清华大学和沈阳二一三厂的产品X-213A铣床数字控制机都存在着这种情况:阅读机运行时,在程序段指令出现后,不能准确地停在程序段“完毕”指令的位置上,而是有很大的过冲程,造成下一段程序中第一个指令经常漏读,系统无法准确运行,有时造成零件报废;另外,当阅读机在运行时出现“紧停”信号后,阅读机还继续运行,造成纸带断裂、破损,继续加工时又必须从头开始。为此,我们对起停控制在逻辑线路上和光
In actual use, Tsinghua University and Shenyang No. 213 plant products X-213A milling machine digital control of the existence of such a situation: reader operation, after the block command appears, can not accurately stop in the block “finished Instruction ”position, but there is a large overshoot, resulting in the next instruction in the first instruction often missed, the system can not run accurately, sometimes causing scrap parts; In addition, when the reader is running," tight stop After the signal, the reader also continued to run, resulting in broken tape, damaged, continue processing must start again. To this end, we control the start and stop on the logic and light