概念
Trend Logs
A trend log is a collection of time-stamp values. In WebStation, you can create a trend log from a value.
Interval Trend Logs
The interval trend log collects data at a specific time interval. Each logged value is stored as a record in the trend log. Use this trend log when the logging interval is less than 1 hour.
有关更多信息，请参阅 Interval Trend Logs .
Extended Trend Logs
You use an extended trend log to transfer records from a trend log. An extended trend log can be connected to a trend log or connected in a series to another extended trend log. Only one extended trend log can be connected to a trend log.
有关更多信息，请参阅 Extended Trend Logs .
Log Record Storage
All trend logs use circular storing. How many records a trend log can store before overwriting old ones depends on the trend log configuration.
有关更多信息，请参阅 Log Record Storage .
Meter Function
The meter function adds meter properties to any trend log type to seamlessly handle consumption calculations independent of meter rollover or meter exchange.
有关更多信息，请参阅 Meter Function .
How Trend Logs Work
Interval Trend Logs
Meter Function
Extended Trend Logs
Log Record Storage
Manually Adding a Trend Log Record to a Trend Log