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AVEVA™ Historian

Message

  • Last UpdatedMar 10, 2025
  • 1 minute read

Contains one row for each on/off message pair that can be associated with a discrete tag. For example, a message pair may be "Open" and "Closed" and could be associated with valve and switch positions.

Column

Data Type

Description

(PK) MessageKey

int NOT NULL

The unique numerical identifier of a TRUE/FALSE message pair that can be associated with a discrete tag. This value is automatically generated by the system when the message pair is added.

Message0

nvarchar(64) NULL

The message associated with the FALSE state of the discrete tag. The maximum number of characters is 64. A discrete tag set to 0 is in the FALSE state.

Message1

nvarchar(64) NULL

The message associated with the TRUE state of the discrete tag. The maximum number of characters is 64. A discrete tag set to 1 is in the TRUE state.

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