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AVEVA™ Historian

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Types of tags

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  • Last UpdatedMar 07, 2025
  • 2 minute read

AVEVA Historian can handle a wide range of data by supporting these tag types:

  • Analog
    Measures a continuous physical quantity, such as a tank’s volume or a boiler's temperature.

Analog tag example

  • Discrete
    Records one of two states for the tag. For example: on/off, open/closed, jam/cleared.

Discrete or boolean tag example

  • String
    Captures a text expression--with no special format--that is treated as a single data item. A string tag could be used to capture the state of a machine; for example: "started", "stopped", "jammed", or "cleared".

String tag example

  • Event
    Records an instance when a tag meets a preset requirement. For example, a process event tag can let you know when a batch number changes.

Event tag example

  • System
    Reflects a predefined system variable. System tags are used to collect the system's performance data. AVEVA Historian system tags have a "Sys" prefix (for example, SysTimeSec).

System tag example

  • Analog summary
    Reflects summarized data (minimum, maximum, average, and so on) that is configured to be replicated from one historian to another.

  • State summary
    Reflects summarized data (minimum time in state, maximum time in state, average time in state, and so on) that is configured to be replicated from one historian to another, or stored locally.

You can configure analog, discrete, string, and legacy history event tags through the Operations Control Management Console (OCMC). For more information, see View and configuring tags in the AVEVA Historian Administration Guide.