Agent Tag Fields

The following set of fields are potentially available for every OPC-enabled tag. A subset can be defined using SNMPAgentTagExposedProperties.

• Name - The full VTScada tag name
• Value - Value if the tag if Quality is good
• Quality - quality of the tag Value, as follows:
  • Bad (0)
  • Configuration Error (4)
  • Uncertain (64)
  • Engineering units exceed low limit (85)
  • Engineering units exceed high limit (86)
  • Good (192)
  • Good with manual override (216)
• Timestamp - UTC timestamp associated with the tag
• Type - Name of the tag type
• Description - Description of the tag
• Area - Area of the tag
• Units - Engineering units associated with the tag value
• Device - Name of the associated I/O device tag
• Address - I/O device address associated with this tag

Except for Value, all fields are read-only.

Quality values 85 and 86 will occur only for VTScada tags that map to 32-bit integers, such as the Counter tag.