Configuring the logging of plant object types (RT Unified) - WinCC Unified

Introduction

Save the values of the data members of the plant object types in logs for later evaluation. Alarm logging can be used to analyze error states, to optimize maintenance cycles, and to document the process.

Create a logging tag for each data member of the plant object type. These logging tags are saved in the data log of the assigned device.

You can analyze the logged tag values directly in your project, such as in a trend view, or in another user program, such as Excel.

The logging tags are created for the plant object types. This means that the plant objects are automatically supplied with the logging tags of the plant object types.

Requirement

• The plant hierarchy has been created and assigned to a device.

• A plant object type with associated external or internal data members (with elementary data types) has been created.

Procedure

1. Under "Interface", jump to the "Logging tags" tab in the middle part of the work area.

2. Under "Interface", select a data member of a plant object type that you want to log.

3. Click "Add" under "Logging tags".

   A logging tag is created.

   The logging tag is linked to the tag. The data type of the logging tag corresponds to the data type of the connected tag.

   Note A logging tag is automatically assigned to a data log. This assignment cannot be changed. The assignment is only possible if the plant hierarchy is assigned to a HMI device.

4. Specify the logging mode.

   Note Depending on the configuration, the database can grow very quickly. This can occur, for example, when you select a short cycle without smoothing and without compression.

5. When the "Cyclic" logging mode is set, define the logging mode and the factor under "Properties > Properties > Cycle".

6. Define the tag trigger depending on the logging mode.

7. Define the limit values.

   Note Process values that are outside the set limit range will not be logged.

8. Define the smoothing.

9. If you have selected the "Cyclic" logging mode, define the compression.

Logging tags and logging is available under "Visualizing processes with Runtime Unified".