使用点故障虽然也根据相关的更高级的内部硬件故障来置位，但是点故障同样适用于外部I/0故障(例如，I0C故障或丢失机架)。要使用点故障，必须在CPU硬件配置的存储器键内将其使能。使能后，离散I0的每个点和模拟l/O的每个通道都会在PLC存储器内分配。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。

SCI PC Board 080-2396 Solid Controls Inc #14640

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