Page History

Create Script Expressions, Tasks and Classes.

Tutorials → Scripts| Tutorial | How-to Guide | Reference

1. Create Tag Expressions

1. Navigate to Scripts → Expressions
2. Add temperature conversion:

Add status logic:

2.

What You'll Learn

• Write tag expressions
• Create script tasks
• Build script classes
• Use multiple languages (C#, VB.NET, Python)

Prerequisites

• Basic programming knowledge
• Tags configured in UNS

Step 1: Simple Tag Expressions

1. Navigate to Unified Namespace → Tags
2. Add calculated tag:

Temperature Conversion:

• Name: Tank1_TempF
• Expression: @Tag.Tank1_TempC * 9/5 + 32
• Type: Double
• Description: Temperature in Fahrenheit

Conditional Logic:

• Name: System_Status
• Expression: @Tag.Motor1_Running AND @Tag.Pump1_Running ? "Running" : "Stopped"
• Type: Text

Create Script Task

1. Go to Scripts → Tasks
2. Add new task:

Production Counter:

csharp

1. Click plus icon, name: ShiftCounter
2. Choose language CSharp
3. Press OK
4. Use Server.DateTimeInfo.Hour as Trigger
5. Double-click to open Code Editor
6. Enter code (no method wrapper):

// Reset counter at shift change
DateTimeint nowhour = DateTime@Server.DateTimeInfo.NowHour;
if (now.Hourhour == 6 || now.Hourhour == 14 || now.Hourhour == 22)
{
    if (@Tag.ShiftReset == false)
    {
        @Tag.Units_Previous = @Tag.Units_Produced;
        @Tag.Units_Produced = 0;
        @Tag.ShiftReset = true;
    }
}
else
{
    @Tag.ShiftReset = false;
}

Configure:

Rate: 60000ms (1 minute)
Domain: Server
Step 3: 
3. Build Script Class
Navigate to Scripts → Classes
Create class: 
TankCalculations
 TankCalculations
Enter methods (no class declaration):
csharp

public class TankCalculations
{
    public static double CalculateVolume(double level, double diameter)
    {
        double radius = diameter / 2;
        return Math.PI * radius * radius * level;
    }
    
    public static double FlowRateCalculateFlowRate(double volumeStart, double volumeEnd, int minutes)
{
    {if (minutes == 0) return 0;
        return (volumeEnd - volumeStart) / minutes;
    }
    
    public static string GetAlarmTextGetStatusText(double value, double limit)
    {
        if (value > limit)
            return $"High: {value:F2} (Limit: {limit:F2})";
        else
            return "Normal";
    }
}
Step 
4
: 
. Use Class in Expression
Go to Scripts → Expressions
In tag expressions:
csharp
@Script
Create volume calculation:
Field
Value
Object
Tag.Tank1_Volume
Expression
Script.Class.TankCalculations.CalculateVolume(
@Tag
Tag.Tank1_Level, 
 
 10.5)
Step 5: Python Integration
Scripts → Settings
Enable Python
Create Python script:
python
import numpy as np
from datetime import datetime

def calculate_statistics(values):
    """Calculate statistical values"""
    arr = np.array(values)
    return {
        'mean': np.mean(arr),
        'std': np.std(arr),
        'max': np.max(arr),
        'min': np.min(arr)
    }

def predict_value(history, hours_ahead):
    """Simple linear prediction"""
    # Implementation here
    return predicted_value

# Set tag values
tags['Stats_Mean'] = calculate_statistics(history)['mean']
Step 6: Event-Driven Scripts
Create event handler:
csharp
// On tag change event
public void OnTemperatureChange()
{
    if (@Tag.Tank1_Temperature > @Tag.HighLimit)
    {
        @Tag.Alarm_Active = true;
        @Script.Class.Notifications.SendEmail(
            "operator@company.com",
            "High Temperature Alert",
            $"Tank 1: {@Tag.Tank1_Temperature}°C"
        );
    }
}
Bind to tag:
Tag: Tank1_Temperature
Event: OnValueChange
Script: OnTemperatureChange
Step 7: Database Operations
Script for database logging:
csharp
public void LogProduction()
{
    string query = @"
        INSERT INTO ProductionLog 
        (Timestamp, Product, Quantity, Operator) 
        VALUES 
        (@time, @product, @qty, @user)";
    
    @Dataset.DB.SqlExecuteCommand(query,
        "@time", DateTime.Now,
        "@product", @Tag.Current_Product,
        "@qty", @Tag.Units_Produced,
        "@user", @Client.UserName
    );
}
Step 8: Test Scripts
Start Runtime with debugger
Set breakpoints in scripts
Monitor script execution:
Scripts → Monitor
Check execution time
View error messages
Best Practices
Handle exceptions properly
Log important events
Optimize for performance
Comment complex logic
Test edge cases
Use meaningful variable names
Next Steps
[SQL Database Query] - Database integration
[Reports Module] - Automated reporting
[Create Dashboards] - Display calculations
Execution
OnChange
Note: No @ symbol needed in expressions

Test and Debug
Build verification:
Check green checkmark in BuildStatus
Review BuildErrors if red X
Runtime monitoring:
Go to Scripts → Scripts Monitor
Check Counter
Review LastRun
Debug with breakpoints:
Follow Debugging Scripts Code to debug the code
 Excerpt Include
Scripts Module
Scripts Module
nopanel
true

In this section...