用户必须为外部继电器提供线圈电流。
The user must supply the coil current for the external relays.
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.
增加外部过载保护是防止电机烧毁的有效手段，如热继电器保护。
Increase external overload protection is to prevent motor burned effective means, such as thermal relay protection.
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