当DO_ 10接收到能流，且输入基准指定，PLC从ST到END对输入点进行扫描。如果给ALT指定-一个输入基准，新的输入值的副本放在从该输入基准开始的存储器中，实际输入值不刷新。ALT必须和扫描到的输入类型大小相同。如果ST和END使用的离散输入,ALT也必须是离散的。
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Universal Unitary Controller Board 016-4047RG #35042
