Alarm indication signal (AIS) should be progressive response, light first and then sonance follows, the time interval should be 15 secs.
告警
逐级相，先光后声，时间间隔为15秒。
Alarm indication signal (AIS) should be progressive response, light first and then sonance follows, the time interval should be 15 secs.
告警逐级相，先光后声，时间间隔为15秒。
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