Data Logging

Data Logging Basic:-

Data is information that is collected during the process and saved in the memory of one of the
connected automation systems. They represent the status of a plant in the form of
temperatures, fill levels or switching states, for example. You define tags for acquiring and
editing the process values in WinCC.

External tags are used in WinCC to collect process values and to access a memory address
in the connected automation system. Internal tags are not linked to any process and are only
available at the associated HMI device.

Logging methods

WinCC supports the following logging methods:
● Circular log
● Segmented circular log
● Circular log which sends a system alarm when it is full
● Circular log which executes system functions when it is full.

To create a data log, proceed as follows:

1. Double-click on the "Historical Data" entry in the project tree.

2. Open the "Data logs" tab and double-click "Add" in the "Name" column of the "Data logs"
editor.

3. In the Inspector window select "Properties > Properties > General."

4. Enter a unique name for the log in the "Name" field.

5. Define the number of data records to be logged in each log in the "Number of data records
per log" field.

6. In the "Storage location" field you select where the log entries are saved.

7. Depending on the selected "Storage location", you either select the "Path" or the "Name of
the data source".

8. If necessary, enter a descriptive text in the "Comment" category to document your
configuration.

Alternatively you can configure log properties directly in the "Data log" editor. 

To view hidden columns, activate the column titles using the shortcut menu.


Example of Data Logging Configuration in RT Advanced using TIA Portal.

Data Logging