Learn Citect-scada - 10 Code Examples & CST Typing Practice Test

Citect SCADA (now AVEVA Plant SCADA) is a high-performance industrial SCADA system designed for reliable real-time monitoring, process control, alarming, and visualization in manufacturing, energy, utilities, and infrastructure environments.

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Hello World Message in Citect SCADA Increment an Integer Tag Toggle a Boolean Tag Display Tag Value in Graphic Acknowledge Active Alarms Write Multiple Tags at Once Slider Control for Speed Tag Log Button Click Event Read Multiple Tags into Array Conditional Action Based on Tag Value

Learn CITECT-SCADA with Real Code Examples

Updated Nov 27, 2025

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Code Sample Descriptions

Hello World Message in Citect SCADA

Message("Hello World from Citect SCADA!");

Show a simple message box in Citect SCADA using Cicode.

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Increment an Integer Tag

INT val;
val = TagReadInt("Counter");
val = val + 1;
TagWrite("Counter", val);

Increase the value of an integer tag by 1.

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Toggle a Boolean Tag

BOOL current;
current = TagReadBool("LightOn");
TagWrite("LightOn", NOT current);

Toggle a boolean tag, useful for lights or motor start/stop.

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Display Tag Value in Graphic

REAL level;
level = TagReadReal("TankLevel");
SetLabelText("TankLevelLabel", NumToStr(level, 2));

Read a tag and display it in a numeric text object in a graphic.

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Acknowledge Active Alarms

AckAlarm("*");

Script to acknowledge all active alarms.

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Write Multiple Tags at Once

TagWrite("MotorStart", TRUE);
TagWrite("MotorSpeed", 50);

Set multiple tag values in a single script.

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Slider Control for Speed Tag

REAL speed;
speed = GetSliderValue("SpeedSlider");
TagWrite("MotorSpeed", speed);

Bind a slider in a graphic to update a speed tag.

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Log Button Click Event

STRING logEntry;
logEntry = DateTime() + " Button clicked";
WriteLog("ButtonLog", logEntry);

Log each time a button is pressed.

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Read Multiple Tags into Array

REAL values[2];
values[0] = TagReadReal("TankLevel");
values[1] = TagReadReal("PumpStatus");

Read several tag values and store them in an array.

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Conditional Action Based on Tag Value

REAL temp;
temp = TagReadReal("TankTemp");
IF temp > 80 THEN
    TagWrite("CoolerOn", TRUE);
ELSE
    TagWrite("CoolerOn", FALSE);
ENDIF;

Control another tag based on a condition.

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Frequently Asked Questions about Citect-scada

What is Citect-scada?

What are the primary use cases for Citect-scada?

Large-scale industrial SCADA monitoring. Water/wastewater plant control. Manufacturing visualization & alarming. Energy and substation monitoring. Redundant distributed control systems

What are the strengths of Citect-scada?

Extremely scalable for large systems. Reliable and proven over decades. Strong redundancy and failover support. Flexible with scripting and customization. Stable performance under heavy I/O loads

What are the limitations of Citect-scada?

UI/graphics builder feels older compared to modern HMIs. More configuration steps than modern low-code SCADA tools. Driver setup sometimes requires manual tweaking. Not as easy for beginners without SCADA background. License cost can be significant for large I/O bases

How can I practice Citect-scada typing speed?

CodeSpeedTest offers 10+ real Citect-scada code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Code Sample Descriptions

Hello World Message in Citect SCADA

Message("Hello World from Citect SCADA!");

Show a simple message box in Citect SCADA using Cicode.

Let’s Try →

Increment an Integer Tag

INT val;
val = TagReadInt("Counter");
val = val + 1;
TagWrite("Counter", val);

Increase the value of an integer tag by 1.

Let’s Try →

Toggle a Boolean Tag

BOOL current;
current = TagReadBool("LightOn");
TagWrite("LightOn", NOT current);

Toggle a boolean tag, useful for lights or motor start/stop.

Let’s Try →

Display Tag Value in Graphic

REAL level;
level = TagReadReal("TankLevel");
SetLabelText("TankLevelLabel", NumToStr(level, 2));

Read a tag and display it in a numeric text object in a graphic.

Let’s Try →

Acknowledge Active Alarms

AckAlarm("*");

Script to acknowledge all active alarms.

Let’s Try →

Write Multiple Tags at Once

TagWrite("MotorStart", TRUE);
TagWrite("MotorSpeed", 50);

Set multiple tag values in a single script.

Let’s Try →

Slider Control for Speed Tag

REAL speed;
speed = GetSliderValue("SpeedSlider");
TagWrite("MotorSpeed", speed);

Bind a slider in a graphic to update a speed tag.

Let’s Try →

Log Button Click Event

STRING logEntry;
logEntry = DateTime() + " Button clicked";
WriteLog("ButtonLog", logEntry);

Log each time a button is pressed.

Let’s Try →

Read Multiple Tags into Array

REAL values[2];
values[0] = TagReadReal("TankLevel");
values[1] = TagReadReal("PumpStatus");

Read several tag values and store them in an array.

Let’s Try →

Conditional Action Based on Tag Value

REAL temp;
temp = TagReadReal("TankTemp");
IF temp > 80 THEN
    TagWrite("CoolerOn", TRUE);
ELSE
    TagWrite("CoolerOn", FALSE);
ENDIF;

Control another tag based on a condition.

Let’s Try →

Frequently Asked Questions about Citect-scada

What is Citect-scada?

What are the primary use cases for Citect-scada?

Large-scale industrial SCADA monitoring. Water/wastewater plant control. Manufacturing visualization & alarming. Energy and substation monitoring. Redundant distributed control systems

What are the strengths of Citect-scada?

Extremely scalable for large systems. Reliable and proven over decades. Strong redundancy and failover support. Flexible with scripting and customization. Stable performance under heavy I/O loads

What are the limitations of Citect-scada?

How can I practice Citect-scada typing speed?

CodeSpeedTest offers 10+ real Citect-scada code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.