Tags

Use

All the data for a source system with which PCo can connect is stored in the form of tags. Each tag is identified by a unique ID and contains the following information:

• Value, for example, measured value

• Specification of the data quality for the value

• Time stamp

The tags are stored in a hierarchy in a node structure. The tags themselves form the lowest level of the hierarchy.

You can subscribe to specific tags in a source system to be able to monitor these tags for possible value changes. (See: Notification Process (with SAP MII).)

Queries can read or write individual tag values or determine information about the tag structure. (See: Query Process (with SAP MII).)

Example

The following graphic shows the hierarchical structure of the data in a source system. The individual nodes (folder symbols) can represent the sensors of a plant, for example. The individual tags - such as Boolean 1, Boolean 2, and so on in the example here - are on the lowest level of the hierarchy.