Tag

Tags are data sources emitting a stream of source messages, such as sensors, PLCs, machines, or devices. In Manufacturing Data Engine (MDE), tags are uniquely identified by tagName. All records in MDE have a tagName attribute, and all records that share the same tagName are collectively referred to as the tag stream.

In the context of metadata, MDE features a special class of metadata buckets called tag buckets. The tagName serves as the natural key in tag buckets. That means, you can attach contextual information to tag names, and metadata instances are versioned on the tag name.

You can also change how MDE processes records that share same tagName in the context of type versions. That means, you can attach configuration parameters to a tagName for type versions. For example, you can override the default type storage specifications for a individual tags in a type version.

Naming restrictions for Tags

A tag name can contain the following:

• Letters (uppercase and lowercase), numbers and the special characters -, !, *, .,_, ( and ).
• Can be up to 255 characters long.

You can use the following regular expression for validation: ^[A-Za-z0-9\\-_\\$\\.\\!\\*\\(\\)]{1,255}$.