函数块逻辑布尔参数或内部变量实例可以强制为on或off状态，或者用于状态转换检测指令。布尔型输入参数通过参数使用时不能被强制或被90-70系列状态转换检测指令(POSCOIL,NEGCOIL,POSCON and NEGCON)使用，因为他们的值不是存储在实例数据中。

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