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概念
产品：
AS-L, AS-B, Enterprise Central, Enterprise Server, AS-P, Project Configuration Tool
功能：
警报
产品版本：
2.0, 2.1, 3.0, 3.1
2018/5/18
Change of State Alarms
The change of state alarm monitors the state changes of digital variables. You configure the alarm to trigger when the variable changes its state to true or to false.
图：
Change of state alarm when the monitored variable goes true
图：
Change of state alarm when the monitored variable goes false
For example, you set up a change of state alarm that monitors a ventilation fan. If the fan breaks or stops working, the alarm is triggered.
You can configure the change of state alarms using shunt variable and time delay. 有关更多信息，请参阅 Alarm Functions .
Alarm Types
Alarms Overview
Alarm Functions
Change of State Alarm Properties – Basic Tab
Creating a Change of State Alarm