Data logger
A data logger samples values of one or more variables at user-defined intervals or at every value change and stores them in a database.
TIP:
You can disable automatic sampling by setting the
Sampling mode
property to None
.Database configuration
FactoryTalk Optix Studio
automatically configures databases for data loggers. When selecting a database for a data logger, for each variable to sample,
FactoryTalk Optix Studio
automatically creates and configures a database table with the following columns:
Column | Description | Present |
---|---|---|
[VariableToLogName] | The value of a specific variable | Always |
[VariableToLogName] _OpCode | The variable code of the reading operation on the controller | If Log operation code of the variable = True |
[VariableToLogName] _Timestamp | The date and time (UTC) of the variable reading on the controller | If Log timestamp of the variable = True |
Timestamp | The date and time of the sample reading on the controller. This timestamp refers to the time when FactoryTalk Optix Studio stops reading all sample variables. | Always |
LocalTimestamp | The date and time of the variable reading on the controller in the machine local time zone. | If Local time log = True |
Automatic sample modes
A data logger can automatically sample:
- All monitored variables
- The data logger samples all monitored variables regardless of their values.
- Only the variables with significantly changed values
- This applies only to theChange in valuesampling mode.The data logger samples only the variables which values vary beyond a dead-band interval in comparison with the previous sampling. The dead-band interval value can be an absolute or percentage value.For example, if the dead-band interval is set to5, the data logger samples only the variables that have an absolute or percentage variation of at least ±5 in comparison with the previous sampling.
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