Advanced SCADA Tag Events Programming in ATSCADA

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication17
{

public partial class Form1 : Form
{

public Form1()
{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)
{

// Event occur when the Tag value changed
iDriver1.Task(“AT-TMSDevice”).Tag(“HighLevel”).TagValueChanged += Form1_TagValueChanged;

// Event occur when the connection status (good or bad) of Tag changed
iDriver1.Task(“AT-TMSDevice”).Tag(“HighLevel”).TagStatusChanged += Form1_TagStatusChanged;

}

void Form1_TagValueChanged(object o, ATSCADA.TagValueEventArgs e)
{

// Show the Tag value when the Tag value changed
MessageBox.Show(iDriver1.Task(“AT-TMSDevice”).Tag(“HighLevel”).Value);

}

void Form1_TagStatusChanged(object o, ATSCADA.TagStatusEventArgs e)
{

// Show the connection status (good or bad) of Tag
MessageBox.Show( iDriver1.Task(“AT-TMSDevice”).Tag(“HighLevel”).Status);

}

}

}

What is SCADA Tag in ATSCADA?

A SCADA Tag is a variable used to represent real-time data collected from field devices such as PLCs, sensors, or control systems. These tags act as a bridge between the physical system and the SCADA software interface.

In SCADA systems, tags are used to:

• Store real-time values (temperature, pressure, status…)
• Enable monitoring, control, and integration with a SCADA login system to manage secure user access
• Trigger actions based on system conditions

SCADA systems are designed to collect and process real-time data from industrial environments, making tags a core component of system operation .

Understanding SCADA Tag Events

In advanced ATSCADA programming, SCADA Tag Events are used to handle changes in system data automatically.

There are two main types of events:

1. Tag Value Changed Event

This event occurs when the value of a SCADA Tag changes.

👉 Example:

• Temperature exceeds threshold
• Machine status changes from OFF to ON

This allows developers to trigger actions immediately when data changes, such as activating a SCADA alarm management system for critical conditions.

2. Tag Status Changed Event

This event occurs when the connection status of a SCADA Tag changes.

👉 Example:

• Tag status changes from Good → Bad
• Loss of communication with PLC

This helps detect communication issues and improve system reliability.

Programming SCADA Tag Events in C#

ATSCADA supports advanced programming using C#, allowing developers to handle SCADA Tag Events effectively.

Basic Concept:

• Subscribe to Tag events
• Execute functions when events occur
• Process real-time data instantly

Example Use Cases:

• Automatically log data when value changes
• Send notifications when status becomes “Bad”
• Control devices based on Tag conditions

By using C#, developers can create flexible logic for handling SCADA Tag behavior in real-time systems.

How SCADA Tag Events Work in ATSCADA

The workflow of SCADA Tag Events typically includes:

1. Data is collected from field devices (PLC, sensors)
2. SCADA Tag is updated in real time
3. Event is triggered when value or status changes
4. Application executes programmed actions

This mechanism ensures fast response and accurate system control.

Benefits of Using SCADA Tag Events

Implementing  ATSCADA brings many advantages:

• Real-time response to system changes
• Improved automation and control
• Reduced manual intervention
• Faster detection of system errors

These benefits are essential in modern industrial environments where efficiency and reliability are critical.

Applications of SCADA Tag Programming

SCADA Tag Events are widely used in:

• Manufacturing systems
• Energy monitoring systems
• Water treatment plants
• Smart factory automation

They help ensure that systems react immediately to changes, improving overall performance.

Conclusion

Advanced programming with SCADA Tag events in ATSCADA enables powerful real-time control and monitoring capabilities. By leveraging Tag Value and Tag Status events, developers can build responsive and intelligent SCADA systems.

With the flexibility of C# and the robust architecture of ATSCADA, programming becomes a key factor in achieving efficient industrial automation

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