The basic security strategy for any automation system is to manage user and network access to the system to protect the controller from attack.

用于任意自动化系统的这项基本安全策略用于管理用户和网络进入系统以保护控制器收到攻击。

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If controller is linked with alarm output and network fire control expansion board, it can also drive alarm annunciator calling to deter crime and warn the security guard.

如果控制器接了报警输出及消防联动扩展板，还可以现场驱动报警器鸣叫，威慑犯罪人员和提醒保安赶来。

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