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COBie.Component.TagNumber -- Expected Values

The COBie.Component.TagNumber parameter provides the physical asset tag or label identifier assigned to a component.\ This value links the digital model to the actual tagged asset in the building, enabling accurate maintenance, inspection, repair, and FM workflows.

Tag numbers are typically applied by the contractor or commissioning team and must reflect the real identification visible on the installed equipment.

Validation Rules (DAQS)

  1. Mandatory where asset tags are required\ Any component that receives a physical label, barcode, QR code, or asset sticker shall have a corresponding TagNumber.

  2. Allowed characters

    • Letters (A--Z)\
    • Numbers (0--9)\
    • Hyphens -\
    • Underscores _\
    • Periods .\
    • Manufacturer/contractor tag formats are permitted as long as they follow project conventions.

  3. Format flexibility\ TagNumber may include structured codes such as:

    • System-based tagging\
    • Equipment hierarchy codes\
    • FM system asset IDs

    Examples: MECH-01-PR-04, ASSET_22319, LGT.204-A

  4. No placeholders\ The following are not accepted:\ N/A, UNKNOWN, ---, TEMP, TBD, or blank values for assets that must be tagged.

  5. Uniqueness requirement\ Tag numbers must be unique within the project, unless explicitly defined otherwise in the BEP.

  6. Consistency with physical labels\ The TagNumber shall exactly match the identifier printed on the physical tag applied to the component.

  7. Responsibility\ Contractors or commissioning teams assign TagNumbers.\ Designers shall not guess or pre-fill these values.

Good Examples

Component Type Valid COBie.Component.TagNumber Example

Pump PMP-01-004 Fan Coil Unit FCU-L02-17 Lighting Fixture LGT.2.45-A Electrical Panel DB-M1-LG01 Sensor SNSR_2041

Common Mistakes

Incorrect Value Issue

Pump 01 Descriptive; not a structured tag

TBD Placeholder; not permitted

12345 Generic number; not a real tag unless confirmed

Empty Missing required asset identification

See drawings External reference; not allowed

Relationship to Revit

Autodesk's COBie Extension typically maps this from:\ Revit → Instance Parameter "Tag Number"\ (or the equivalent shared parameter in the COBie template).

Important notes: - TagNumbers shall be assigned after installation or during commissioning.\ - Instance parameters must be used; Type parameters are not acceptable.\ - The value must match O&M manuals, labels, and FM system data.

Best Practices

  • Apply TagNumbers in alignment with the project's asset tagging strategy.\
  • Avoid multiple formats---use one consistent structure across the discipline.\
  • Double-check that digital tags match physical labels on installed equipment.\
  • Validate TagNumbers before COBie export to ensure correct formatting and uniqueness.\
  • Maintain a master asset register linking TagNumbers to serial numbers and locations.