Configuration

You can use the TwinCAT OPC UA Configurator to configure the Historical Access functionality.
To configure a symbol for Historical Access, you must perform three steps:

  1. The symbol must have been enabled for Data Access (see chapter Enabling symbols).
  2. A memory type must be created in which the symbol values are to be saved.
  3. Configuration parameters must be defined for the symbol.

Creating a memory type

In the standalone version of the TwinCAT OPC UA Configurator you can configure the memory types (so-called "History Adapters") via the Historical Access tab. In the following screenshot, for example, the memory type "Main memory" ("Volatile") has been configured.

Configuration 1:

Additional memory types can be created or existing memory types can be edited or removed from the configuration via the context menu.

Configuring a symbol

In the "History Nodes" section of the same dialog, you can configure the symbols and link them to a memory type. You can either create a symbol manually (assuming you know its "address" or NodeID), or simply drag and drop an existing symbol into the configuration area using the integrated Target Browser.

Configuration 2:

The symbol is then added with default configuration values. You can modify these configuration values by double-clicking on the symbol entry. Here you can also create the link to a memory type, which is referenced via its ID.

Configuration 3: