之前一个正常响应里的字节数。输出状态数据充填在正常响应的数据字段中。每个字节包含8个输出点的值。第一个字节的最低有效位(LSB)包含输出点的值，该输出点编号等于开始点编号加上1。输出点的值按序排列，以数据字段的第-一个字节的最低有效位开始，以数据段的最后一个字节的最高有效位结束。如果点数不是8的倍数，最后–个数据字节最高的1到7位是0.

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