当主机中的扫描卡被全部用完之后，这些输出可用来控制少量的外部继电器。
These outputs can be used to control a few external relays in case the scanner CARDS in the mainframe are already committed.
当主机中的扫描卡被全部用完之后，这些输出可用来控制少量的外部继电器。
These outputs can be used to control a few external relays in case the scanner CARDS in the mainframe are already committed.
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