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What are the best methods for ensuring your control logic design meets performance specifications?

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Control logic design is the process of creating and implementing the rules that govern the behavior and interaction of a system or device. It can be applied to various domains, such as robotics, automation, electronics, software, and industrial engineering. However, designing effective and reliable control logic can be challenging, especially when dealing with complex, dynamic, or uncertain environments. How can you ensure that your control logic design meets the performance specifications and requirements of your project? Here are some best methods and practices to follow.

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Gareth S.

Solutions Architect @ various. Electrical Engineering, Control Systems, EEHA, Systems Analysis, Integration…

1 Define clear objectives and criteria

Before you start designing your control logic, you need to have a clear understanding of what you want to achieve and how you will measure it. You should define the objectives and criteria of your control logic design in terms of functionality, reliability, efficiency, safety, and usability. You should also consider the constraints and trade-offs that may affect your design, such as cost, time, resources, and compatibility. By defining clear objectives and criteria, you can focus your design efforts and evaluate your results more effectively.

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Gareth S.

Solutions Architect @ various. Electrical Engineering, Control Systems, EEHA, Systems Analysis, Integration, Specification, Development, Improvement, Refurbishment.
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The first step is problem identification, to ensure you are trying to solve the right problem. It is amazing how often the client will approach you with the definition of their problem in the form of the answer they expect, and you discover that they have not fully understood the problem to begin with. Once you are sure the problem is understood, then you can develop requirements to address this problem. One of my favorite ways to develop requirements is to get stakeholders together, divide the white into three zones - things we want, things we don't want, things that are but not sure. Collect bullet points in the various columns over 30-90 minutes of brainstorming and you usually have enough to write a preliminary specification.

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2 Use a systematic approach

Designing control logic is not a random or intuitive process; it requires a systematic approach that follows a logical sequence of steps and phases. Depending on the nature and scope of your project, you may use different methodologies or frameworks, such as the V-model, the waterfall model, or the agile model. However, most control logic design processes share some common elements. Firstly, you should analyze the problem, context, stakeholders, and requirements of your control logic design. Secondly, you should design its structure, components, interfaces, and algorithms. Thirdly, you should implement your design using appropriate tools, languages, and platforms. Fourthly, you should test it to verify functionality, performance, and quality. Fifthly, you should validate to ensure it meets objectives and criteria defined. Lastly, you should document it to provide a clear description of features, functions and specifications.

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Gareth S.

Solutions Architect @ various. Electrical Engineering, Control Systems, EEHA, Systems Analysis, Integration, Specification, Development, Improvement, Refurbishment.
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Most times, your control logic will be state based behavior, so there is no better way to define the detailed specification than as a state machine, or hierarchy of state machines. It can seem like a lot of work, but it is a complete definition and all that work would need to be done by completion anyway, so might as well do it now. One way of looking at it, is if you can't describe what you want in such detail, how is someone supposed to code it? It is best to use state tables, because every transition condition is considered. Anything not relevant or don't care can have an X, but but this at least shows it was considered.

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3 Apply modular and hierarchical design principles

Applying modular and hierarchical design principles can be a great way to simplify and organize your control logic design. Modular design breaks down the control logic into smaller, independent units or modules that perform specific tasks or functions. Hierarchical design arranges these modules into different levels or layers of abstraction and complexity. This approach can reduce complexity and improve readability, increase reusability and maintainability, enhance scalability and flexibility, and facilitate testing and debugging of your modules.

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Gareth S.

Solutions Architect @ various. Electrical Engineering, Control Systems, EEHA, Systems Analysis, Integration, Specification, Development, Improvement, Refurbishment.
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System and subsystem decomposition can be a black art, especially with state machine approach and the possibilities of state explosions. But one of the first things to do is condition sub-systems with modes (eg auto/off/manual) so that you have a mode state machine and an equipment state machine, interdependent. Once you get the hang of it, you will see this also allows very precise specification in detail of the desired functionality especially for things like if the drive keeps running in transition of modes (eg keeps running from man to auto, but does not for auto to man), and such like.

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4 Use standard notation and conventions

Using standard notation and conventions is an effective way to improve the clarity and consistency of your control logic design. Notation refers to the symbols, diagrams, and languages used to represent and communicate your control logic, while conventions refer to the rules, guidelines, and best practices for writing and formatting it. Adopting standard notation and conventions can help avoid ambiguity and confusion in your control logic, ensure compatibility with other systems or devices, comply with industry regulations and standards, and make your control logic easier for others to understand and review.

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5 Seek feedback and review

To ensure that your control logic design meets the performance specifications, it is important to seek feedback and review from different sources and perspectives. Don’t rely solely on your own judgment or assumptions, but instead gain input and advice from your clients, customers, or end-users, colleagues, peers, or mentors, as well as experts, consultants, or validators. Through this process you can identify any errors, flaws, or gaps in your design; as well as uncover new opportunities for improvement and innovation.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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What are the best methods for ensuring your control logic design meets performance specifications?

1

2

3

4

5

6

1 Define clear objectives and criteria

2 Use a systematic approach

3 Apply modular and hierarchical design principles

4 Use standard notation and conventions

5 Seek feedback and review

6 Here’s what else to consider

Engineering Design

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What are the best methods for ensuring your control logic design meets performance specifications?

1

2

3

4

5

6

1 Define clear objectives and criteria

2 Use a systematic approach

3 Apply modular and hierarchical design principles

4 Use standard notation and conventions

5 Seek feedback and review

6 Here’s what else to consider

Engineering Design

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