Concept
Variable Triggered Trend Logs
The variable triggered trend log records the variable when the conditions of the associated trigger variable are met. Use this type of trend log when the log interval is scheduled to log monthly or yearly, or when another device is used to trigger the log.
For example, in the figure below, the variable triggered trend log records a variable every time the associated trigger variable, for example, a switch, changes to true. The records are printed in a trend chart. Notice that the variable triggered trend log records the variable without any regard to time or delta.
Variable triggered trend log schematic
You can configure the trend log to collect data when the trigger value changes to True, changes to False, or All changes.
Trigger variable changes to true
Trigger variable changes to false
Trigger variable all changes
Trend Log Types
Trends Overview
Trend Units
Creating a Variable Triggered Trend Log
Configuring a Variable Triggered Trend Log
Variable Triggered Trend Log Properties
Log Record Storage