Voting logic 3ooN (only binary elements)

PLC (Programmable Logic Controllers)
1

Good day!

This is continuing of my topic about voting logic. Here you can see simple example of 3ooN voting logic that uses only binary elements.

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As you can see, conception of voting logic based only on binary elements is scalable.

Could you share your opinion?

Best regards,

Kairat Abdukarimov,

Process Automation Engineer

2

The “3ooN” voting logic (3 out of N) is a fault-tolerant system that is widely utilized in safety-critical applications.

It assures that the system’s choice or output is based on the majority rule, which states that at least 3 of N binary inputs have to agree (be in the same state) before the system may create an output. Here’s how it works, with binary inputs (0 or 1):

Steps for 3oN Voting Logic

Step-1: Inputs

There are N binary inputs (0 or 1), with N larger than or equal to three.

Step-2: Vote Calculation

This logic determines how many of the N inputs are equal to one.

Step-3: Decision Rule

If three (or) more of the inputs are 1, the result will be 1 (the system selects 1). Alternatively, the output is zero.

Key Characteristics

Fault Tolerance

The system can accept up to N-3 inaccurate or wrong inputs while still providing a consistent output.

Majority Agreement

The decision is valid if at least 3 components valid.

Illustration

Example for

N = 5

  • Inputs are [1, 0, 1, 1, 0]
  • Since 3 of the 5 inputs are 1, the output will also be 1.

This voting logic is commonly employed in redundant systems such as power plants, avionics, & other important systems that require high levels of safety and reliability.

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