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To configure a tag for unit conversion:

1. Set the tag’s Units property. You can do this through the Unified Namespace / Tags table. You can also change it via CodeBehind or Scripts, by assigning a value to Tag.<TagName>.Units.
2. To apply unit conversions to your solution, assign the name of the desired conversion table to the Client.Units property.
3. All tags with units affected by the conversion table will have their values changed. To display the tag’s unit after conversion, use Tag.<TagName>.DisplayUnits.

Displays →  Tutorial | Concept | How-to Guide | ISA-101 | Reference

Configuration Steps

1. Set Tag Units
   • Navigate to Unified Namespace → Tags
   • Configure Units property for each tag
   • Or set via script: @Tag.Temperature.Units = "°C"
2. Apply Conversion Table
   • Assign conversion table to client
   • Set @Client.Units = "MetricToImperial"
   • Values automatically convert
3. Display Converted Units
   • Use @Tag.Temperature.DisplayUnits
   • Shows converted unit string
   • Updates with conversion changes

Conversion Table Properties

Conversion Formula

NewValue = (BaseValue / Div) + Add

Standard Conversions

Temperature

Length

Pressure

Runtime Usage

Client-Side Configuration

csharp

// Set conversion table for client
@Client.Units = "MetricToImperial";

// Check current conversion
string currentTable = @Client.Units;

// Remove conversion
@Client.Units = "";

Tag Properties

csharp

// Original unit
string baseUnit = @Tag.Pressure.Units;  // "bar"

// Converted unit (after conversion applied)
string displayUnit = @Tag.Pressure.DisplayUnits;  // "psi"

// Original value
double baseValue = @Tag.Pressure.BaseValue;  // 10 bar

// Converted value
double displayValue = @Tag.Pressure.Value;  // 145.04 psi

Creating Custom Tables

1. Navigate to Displays → Units Conversion
2. Create new conversion set
3. Define conversions:
   • BaseUnit and NewUnit
   • Div and Add factors
   • MeasurementType category

Example: Custom Speed Conversion

BaseUnit: m/s
NewUnit: km/h
Div: 0.278
Add: 0
MeasurementType: Speed

Multi-Client Scenarios

Different Units Per Client

csharp

// Client 1 - US Operator
@Client.Units = "ImperialUnits";
// Sees: 72°F, 14.7 psi, 100 ft

// Client 2 - EU Operator  
@Client.Units = "MetricUnits";
// Sees: 22.2°C, 1.01 bar, 30.5 m

// Server stores single value set
// Each client sees converted display

Best Practices

1. Define Units Early - Set during tag creation
2. Group by Type - Organize conversions by measurement
3. Test Conversions - Verify accuracy
4. Document Custom - Explain custom conversions
5. Consider Precision - Account for rounding
6. Default Tables - Provide standard sets
7. User Preferences - Store per operator

Measurement Types

Organize conversions by category:

• Temperature - °C, °F, K
• Pressure - bar, psi, kPa, MPa
• Flow - m³/h, gpm, l/s
• Length - m, ft, km, mi
• Mass - kg, lb, ton
• Volume - l, gal, m³
• Speed - m/s, km/h, mph
• Energy - kWh, BTU, J

Troubleshooting

Values not converting:

• Check Units property set on tag
• Verify conversion table assigned
• Confirm table contains unit mapping
• Review Div/Add factors

Wrong conversion:

• Check formula factors
• Verify unit strings match exactly
• Test with known values
• Review calculation order

Client differences:

• Confirm each client's Units setting
• Check local vs server values
• Verify table assignments
• Test client isolation

Examples

Temperature Gauge

xml

<TextBlock Text="{Tag.Temperature.Value}" />
<TextBlock Text="{Tag.Temperature.DisplayUnits}" />
<!-- Shows: "72" and "°F" for Imperial client -->

Dynamic Switching

csharp

public void ToggleUnits()
{
    if (@Client.Units == "MetricToImperial")
        @Client.Units = "";
    else
        @Client.Units = "MetricToImperial";
}

In this section...

Units Conversion Table Columns 

Property

Description

ID

Identifies each unit conversion entry uniquely.

VersionID

Tracks the version of the unit conversion entry.

BaseUnit

Represents the original unit of measurement before conversion.

NewUnit

Represents the unit of measurement after conversion.

Div

Indicates the division factor used in the conversion process.

Add

Indicates the addition factor used in the conversion process.

BaseName

Names the base unit.

NewName

Names the new unit after conversion.

DateCreated

Records the creation date and time of the unit conversion entry.

DateModified

Records the last modification date and time of the unit conversion entry.

MeasurementType

Specifies the type of measurement for the units involved, such as length or weight.

In this section: