我厂线切割机过去输入程序是采用光电输入机和手扳键输入。但光电输入有时不可靠,手键输入虽可靠,但每输入一道程序要扳键几十次,效率低。为了克服这样缺点,我们设计了按键式手输入线路(如图)。它的优点是输入效率高,每送一个数或指令只需按键一次,不必熟记扳键形式,减轻了劳动强度,线路简单可靠,可以极方便地加装在原机床控制台上。本线路原理比较简单。我们用50只二极管排成矩阵来编码,6组二极管都是接成负或门形式。每按一个键,通过二极管编码矩阵使I_1～I_5的相对应端输出-12V。而按下任何 I plant in the past, the importation of wire cutting machine is the use of optical input machine and the key input. However, sometimes unreliable optical input, hand input is reliable, but each time you enter a program to pull key dozens of times, low efficiency. In order to overcome such shortcomings, we designed a push-button input line (pictured). It has the advantage of high input efficiency, each sent a number or instruction just press the key, do not have to memorize the pull key form, reducing labor intensity, the line is simple and reliable, can be very easily installed in the original machine console. The principle of this line is relatively simple. We use a matrix of 50 diodes to encode, six groups of diodes are connected into a negative or gate form. Each time a key is pressed, the corresponding terminal of I_1 ~ I_5 is output -12V through the diode code matrix. And press any