One outside alarm input , it can be set to 5 modes : always open ：有一路外部告警，可设置成常开常开锁定常闭常闭锁定或禁用。
Nc normally closed 常态封闭,常闭
One external alarm input , it can be set to 5 modes : always open ：有一路外部告警，可设置成常开常开锁定常闭常闭锁定或禁用。
One channel external alarm , it can be set to 5 modes : always open ：有一路外部告警，可设置成常开常开锁定常闭常闭锁定或禁用。
Normally off on 常闭开
Inside of the limit switch there are screws , four sole switches , tow are normal open , tow are normal close 限位开关内有连接螺钉，单开关有四个，两个常开，两个常闭。
According to the state of the contact points , they are sorted into open type , closed type and combined type 根据触电状态的不同，继电器被分为常开型，常闭型和开闭混合型。
The alarm can be set to 5 states : always open , always open locked , always closed , always closed locked and forbidden 有一路外部告警，可设置成常开常开锁定常闭常闭锁定或禁用。
An isolated relay can have more than one pole and can have normally closed contacts as well as normally open contacts 隔离继电器可以有多个铡刀，可以有常闭触点，也可以有常开触点。
The contact functions normally open normally closed and the contact types p - switching n - switching are available as optional extras 接点功能常开常闭和接点类型p型开关n型开关都可供选择。
