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 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 display value of voltage is out of the scope of upper and lower limit protection value, alarm indication lamp of controller is lighted.
一旦该温度值超越本人们预先设定的上、下限，单片机便启动报警系统停止报警，进而对年夜棚内温度停止节制。
Once the temperature exceeded our pre-determined, the minimum level, SCM will activate alarm system for alarm as well as on the greenhouse temperature control.
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