PAC系统程序块类型自动提供1个OK输出参数用来显示模块中的OK参数的名称为Y0。程序块内的逻辑可以读写Y0参数。程序块调用时，Y0参数自动的初始化为TRUE.除非在程序块内将Y0设为FALSE，否则调用的程序执行完以后会有正电流从调用指令行输出，
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