间接方法察看在模板侧面印有模板样本号的标签，在所有的系列90-30模板中，这个样本号表明了模板的修订级别(版本)，- -些CPU,禅本号包含的后一一个字母说明了CPU全部的修订级别，例如:IC693CPU341-J这告诉我们这个模板的修订级别是J,以后的CPU模板则是两个的修订字母
ALLEN BRADLEY 800T-N2KF4BBBB SER. T, SELECTOR SWITCH, N
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