Change of Value Trend Log Properties

Property	Description
Status	Displays the status of the trend log.
Enabled	Displays True if the trend log is enabled.
Logged variable	Enter the variable that you want to log.
Delta	Select the minimum value change that triggers a new record.
Activation variable	Enter the variable that makes the trend log start recording values when the variable is True . 有关更多信息，请参阅 Trend Log Activation .
Activation time	Specify the time when the trend log is to start recording values. 有关更多信息，请参阅 Trend Log Activation .
Maximum log interval	Select the maximum time that can pass between two recordings regardless if the delta value has been exceeded or not.
Log size	Select the number of records to store before old records are overwritten, including internal records generated by the trend log. 有关更多信息，请参阅日志记录存储 .
Clear when enabled	Select True to clear the trend log when it is enabled.

Status

Displays the status of the trend log.

Enabled

Displays True if the trend log is enabled.

Logged variable

Enter the variable that you want to log.

Delta

Select the minimum value change that triggers a new record.

Activation variable

Enter the variable that makes the trend log start recording values when the variable is True .

有关更多信息，请参阅 Trend Log Activation .

Activation time

Specify the time when the trend log is to start recording values.

有关更多信息，请参阅 Trend Log Activation .

Maximum log interval

Select the maximum time that can pass between two recordings regardless if the delta value has been exceeded or not.

Log size

Select the number of records to store before old records are overwritten, including internal records generated by the trend log.

有关更多信息，请参阅日志记录存储 .

Clear when enabled

Select True to clear the trend log when it is enabled.

Change of Value Trend Log Properties – Basic Tab