The data logging service allows application data archiving (events, alarms, process data, devices status, measures, etc.) in the internal memory of the module. This service allows you to log data in .csv files in the ASCII format. These files are stored locally in the SD memory card of the module.

A data logging table occupies a chunk of the module’s memory (RAM).

The value of logged variables is stored in this table. A new record appears in the table for each logged event. The record can contain a timestamp or value for all selected variables. You can configure the number of records that the table can hold.

When the data logging backup event occurs, the table in RAM is saved as a backup file in the SD card and all table records are cleared.

The data logging service can manage up to 10 tables that are independent of each other. That means each table can have a unique size and a different triggering mechanism. The service can also manage up to 10 groups of data logging files (backups). This mean you can create several different data tables, each of which can be associated with different logging periods.

For example, the folder Table_n represents the backup that corresponds to table_n. The table backup files on the SD memory card can be purged (or deleted) as configured (event n triggered by the CPU). When the module experiences a loss of power during data logging, the records in the RAM table that have not been backed up are lost while the backup files are retained.