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Define and manage tags in your UNS.

Reference → Modules → UNS → UI → Asset | Tags | UserTypes | Enumerations | Services | Monitor

Tag Types

Built-in Types

Timer Types

Reference Type

Dynamic tag addressing:

// Set reference target
@Tag.Reference1.Link = @Tag.TankFarm/Tank1/Level.GetName();

// Use reference 
double level = @Tag.Reference1.Value;

Configuration Properties

Ontology metadata columns (10.1.5+)

Tags in 10.1.5 carry three ontology columns alongside their real-time data: Labels, SourceIri, and Attributes. These columns populate from RDF/OWL individuals imported by the ontology importer and round-trip back through Export Tags → RDF / JSON.

• Labels. Semicolon-delimited alternative names. Imports from skos:altLabel and skos:hiddenLabel. Searchable via search_uns (Designer) and runtime_search_uns (runtime) with one canonical scoring algorithm.
• SourceIri. Full source IRI for the individual. External-system join key. Preserved on re-export, so round-trip is lossless.
• Attributes. JSON column for ontology annotations not covered by other columns (dcterms:*, alt-language labels keyed rdfs:label@pt, skos:note, owl:versionInfo, custom predicates). Runtime-mutable and retentive. Use promote_retentive_attributes before export to roll runtime overlays back into the cold-start data.

See Industrial Ontology Integration How-to for the full model.

Creating Tags

Method 1: Asset Tree

1. Navigate to Unified Namespace → Asset Tree
2. Right-click folder or click New Tag icon
3. Enter tag name and properties

Method 2: Tags Grid

1. Go to Unified Namespace → Tags
2. Options:
   • Click New Item for dialog
   • Type directly in Name column
   • Paste from external source

Method 3: Import

• Copy from another solution
• Import from CSV files
• Use Solution Import Tools
• EngWrapper API

Tag Parameters, Type Specific Settings

Deadband

Limits value updates:

Absolute: +/- 5 units from last value
Percentage: 10% change required

EnumerationSet

Map values to text:

0 -> "Off"
1 -> "On"
2 -> "Auto"

Domain Configuration

Visibility Levels

Affects: OPC UA Server, MQTT Broker, TcpDataAccess

Retentive Options

Storage: Dataset.DB.Retentive database

Format Strings

Numeric Formats

N0    -> 123        (no decimals)
N2    -> 123.45     (2 decimals)
C     -> $123.00    (currency)
P     -> 12.34%     (percentage)
X     -> 7B         (hexadecimal)
E     -> 1.23E+02   (scientific)

DateTime Formats

d     -> 3/15/2024  (short date)
T     -> 14:30:00   (long time)
yyyy-MM-dd HH:mm:ss -> 2024-03-15 14:30:00

Array Configuration

Array size N creates elements [0] to [N]:

Array = 5 creates:
Tag[0], Tag[1], Tag[2], Tag[3], Tag[4], Tag[5]
(6 elements total)

DataTable Tags

Using Queries

@Tag.DataTableTag = @Dataset.Query.MyQuery.SelectCommand();

Manual Population

@Tag.DataTableExample.StartBlockSet();
@Tag.DataTableExample[1].Column1 = value1;
@Tag.DataTableExample[2].Column2 = value2;
@Tag.DataTableExample.CommitBlockSet();

Runtime Attributes

Core Properties

Quality Codes

• 0: Bad quality
• 64: Uncertain quality
• 192: Good quality

Additional Configuration

The TagNames are frequently referenced in these other configuration Tables:

DevicesPoints

• Node: Communication node
• Address: PLC/device address
• AccessType: Read/Write/ReadWrite

AlarmsItems

• Condition: Trigger logic
• Groups: Alarm categorization
• Limits: Threshold values

HistorianTags

• Table: Storage location
• Deadband: Recording threshold
• DeadbandType: Absolute/Percentage

Best Practices Checklist

• Use meaningful names - Follow naming conventions
• Set appropriate types - Match data characteristics
• Configure retentive - Preserve critical values
• Apply deadbands - Reduce unnecessary updates
• Document tags - Use Description field
• Organize in assets - Logical hierarchy
• Set security - Control access levels

Troubleshooting

Tag not updating:

• Check device communication
• Verify Quality = 192
• Review deadband settings
• Confirm not disabled

Wrong value format:

• Check Format string
• Verify Units configuration
• Review scale settings

Array issues:

• Confirm index in range
• Check array size setting
• Verify element access

Retentive not working:

• Check database connection
• Verify retentive setting
• Review database permissions