默认输入量为逻辑0。远方输入1缺1状态设为最后/接通时,冻结输入量以防止失去通讯联系。如果不知道最近的状态，例如在继电器通电之后而第一次通讯未发生之前，输入量默认为逻辑1。当通讯恢复时，输入量恢复可操作。远方输入1缺状态设为最后1断开时,冻结输入量以防止失去通讯联系。如果不知道最近的状态,例如在继电器通电之后而第–次通讯未发生之前，输入量默认为逻辑0。当通讯恢复时，输入量恢复可操作。
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