为了解决上述问题,ADD指令的使能输入应该来自一个跳变(单触发)线圈,如下面所述。在改良的电路里,%10001输入开关控制–个跳变(单触发)线圈,%M0001的触点接通ADD功能块的使能输入,每次扫描%M000使触点%10001闭合-次。为了使%M0001触点再次闭合,触点%10001只能再次分来闭合。
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