Upper alarm limit [分化] 上警告限
When display value of voltage is out of the scope of upper and lower limit protection value, alarm indication lamp of controller is lighted.
当电压、谐波测量显示值超出设定的上、下限保护值的范围时，控制器报警指示灯亮。
When some environmental values exceeded the setting upper and lower limit or faults come out, control system would send out alarm by buzzer and LED.
当环境内某一环境因子超出预先设定的上、下限报警值或系统运行出现故障时，由蜂鸣器和发光二极管进行报警。
When the ultrasonic distance between the module and the obstacle exceeds the upper limit or lower limit, the buzzer alarm.
当超声波模块与障碍物之间的距离超过设置的上限值或者下限值时，蜂鸣器发出报警。
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