一、引言本系统是为取代国内七十年代生产的开环数控机床的控制设备而研制的。这些设备通常称为硬件逻辑控制机,它基本上是由孤立元件和中、小规模集成电路组装的。由于电路复杂、元器件的可靠性差,维修相当困难。尤其是其中的光电阅读机,它在加工过程中处于不断启停的状态,很容易损坏控制纸带,故障率较高。国内许多这样的设备亟待更新换代。 I. Introduction This system is to replace the domestic production of the seventies open-loop CNC machine tools and control equipment developed. These devices, commonly referred to as hardware logic controllers, are basically assembled from isolated components and medium- and small-scale integrated circuits. Due to the complex circuit, the reliability of components is poor, maintenance is quite difficult. Especially one of the photoelectric reader, which is in the process of continuous start-stop state, it is easy to damage the control tape, a higher failure rate. Many domestic such equipment urgently need to be replaced.