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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