用于点故障的PLC存储器相当于整个变量表的大小。在14-11页“使用故障结点”处描述FAULT和NOFLT结点，你可以利用故障结点访问点故障。对故障结点的完全支持依赖于1/0模块的能力。一些90-30系列模块不支持点故障结点。这些模块的点故障结点保持off状态，除非发生丢失模块故障

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