NOT Logic

⚙️ Implementing Logical NOT Operation Using Only Basic Simulink Blocks

When building logic-based control or decision systems in Simulink, we often need to use logical operations such as AND, OR, and NOT. While Simulink provides dedicated blocks for these operations (like the Logical Operator block), there are situations where you might want or be required to implement the same logic manually using only basic blocks.

This explains how to implement the Logical NOT operation — without using the built-in Logical Operator block — using simple Simulink components.

Use Case 1: By inputting the value to 0 with the help of manual switch, the actual & expected Output would be 1.

Use Case 2: By inputting the value to 1 with the help of manual switch, the actual & expected Output would be 0.

Results:

Conclusion:

• Logical NOT can be implemented easily using basic arithmetic or relational blocks.

• The 1 - u method is the simplest and most efficient.

• Use Relational Operator (u == 0) if you want to emphasize logical comparison rather than arithmetic.

• Always ensure your data type is Boolean if your system expects logical signals (e.g., in control or fault handling).

For more info, please visit the blog justsimulink.blogspot.com 

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