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针对中小型 PL C控制系统显示中存在的占用输出点数多、执行时间长等一些实际问题 ,介绍了一种硬软件相结合的解决方法 .显示接口电路以地址译码和显示单元选择相配合 ,仅用 1 6点输出 ,即可实现最多 1 2 8位 LED数码显示 ;软件上以循环显示与更新显示方式相结合 ,程序简洁 ,电路抗干扰能力强 ,更新一位 L ED仅用两个 PL C扫描周期 .
Aiming at some practical problems of small and medium-sized PL C control system display, such as the number of occupied output points and the long execution time, a hardware and software solution is presented.Display interface circuit uses address decoding and display unit selection, Only 1 6:00 output, you can achieve up to 128 LED digital display; software cycle display and update the display combined with simple procedures, the circuit anti-interference ability to update an L ED only two PL C scan cycle.