How to Add FC105 Scaling Block in Siemens S7-300 PLC Programming | Analog Input Scaling Tutorial

In this advanced PLC programming tutorial, you will learn how to add and configure the FC105 SCALE block in Siemens S7-300 PLC programming using SIMATIC STEP 7. This block is widely used for converting raw analog input values into meaningful engineering units such as pressure, level, temperature, and flow.

This tutorial is perfect for:
• PLC beginners
• Automation engineers
• Instrumentation technicians
• Industrial maintenance professionals
• Engineering students learning analog processing

⚙️ What You Will Learn in This Video

✔️ What is FC105 SCALE block in Siemens PLC
✔️ Why analog scaling is important in automation
✔️ How to insert FC105 into S7-300 program
✔️ How to configure analog input addresses (PIW)
✔️ Understanding HI_LIM and LO_LIM parameters
✔️ How to convert raw analog values to engineering units
✔️ REAL data type and memory assignment (MD)
✔️ Practical analog sensor scaling example
✔️ Common FC105 programming mistakes and solutions

🔌 Practical Example Included

Example:

CALL "SCALE" (FC105)
IN := PIW288
HI_LIM := 100.0
LO_LIM := 0.0
OUT := MD10

This example demonstrates how to scale a raw analog signal into a readable process value for industrial applications.

🏭 Industrial Applications of FC105

FC105 is commonly used in:

• Water treatment plants
• Tank level monitoring systems
• Temperature control systems
• Pressure transmitter scaling
• Flow measurement systems
• Industrial process automation

Understanding analog scaling is one of the most important skills in industrial PLC programming.

🔍

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