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PLC Automation Consultancy & Training | Liam Bee

Learn PLC automation properly, through structured courses, deep technical guides, and industrial consultancy.

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Course Catalog

  • Node-RED – Basic Nodes And Uses – 2026 – V4.1

    Node-RED – Basic Nodes And Uses – 2026 – V4.1

    Liam (Site Owner) Liam (Site Owner)

    Difficulty: πŸ”΄β­•β­•β­•β­•

    Number of lessons: 38

  • The Complete Guide To Siemens TIA Portal

    The Complete Guide To Siemens TIA Portal

    Liam (Site Owner) Liam (Site Owner)

    Number of lessons: 39

  • Siemens TIA Portal – Asset Oriented Programming

    Siemens TIA Portal – Asset Oriented Programming

    Liam (Site Owner) Liam (Site Owner)

    Number of lessons: 54

  • Siemens TIA Portal – Using Project And Global Libraries

    Siemens TIA Portal – Using Project And Global Libraries

    Liam (Site Owner) Liam (Site Owner)

    Difficulty: πŸ”΄β­•β­•β­•β­•

    Number of lessons: 12

  • CODESYS PLC Course – Structured Programming With DUTs

    CODESYS PLC Course – Structured Programming With DUTs

    Liam (Site Owner) Liam (Site Owner)

    Estimated Time: 4 Hours

    Difficulty: πŸ”΄πŸ”΄β­•β­•β­•

    Number of lessons: 29

  • Do & Grow – Siemens

    Do & Grow – Siemens

    Liam (Site Owner) Liam (Site Owner)

    Difficulty: Supported By Tutor, πŸ”΄πŸ”΄πŸ”΄πŸ”΄β­•

    Number of lessons: 82

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In this lesson, we take a detailed look at the wash sequence manager and compare how it is implemented in ladder logic versus structured text. The focus is on understanding the differences in approach, structure, and day to day usability when managing a complex sequence in different TIA Portal languages.

The wash sequence is more involved than the other modes because it is made up of an overall governing sequence with several functional sections. These include drain down, fill, air scour, backwash, top wash, and rinse. The lesson explains why these sections are handled inline within a single sequence rather than being broken out into separate function blocks, and when it would make sense to do that instead.

You are walked through the full wash process from start to finish. This includes how wash mode is called, how filtration mode is safely shut down when required, and how fault shutdown conditions are handled. Particular attention is given to level control around the wash weir and why managing the level correctly is critical to protecting the filter media.

The lesson then moves into the structured text implementation using a case statement to manage the sequence steps. You will see how variables are initialized, why this is required in structured text, and how requests must be explicitly reset when they are no longer needed. Timers, internal shutdown requests, and fault handling are all explained in detail.

Each phase of the wash sequence is covered step by step, including air scour timing, backwash behavior, top wash flow, and the rinse process with turbidity checking. The logic behind repeating the rinse when water quality is not acceptable and triggering a failure when limits are exceeded is also explained.

The lesson also covers how the wash sequence interacts with the filtration sequence using interlocks, allowing the wash cycle to interrupt filtration and then hand control back cleanly once complete. This loose coupling approach is highlighted as a robust way to manage interruptible sequences.

Finally, shutdown management is reviewed, showing how all valves are closed, alarms are raised, and the sequence is safely returned to idle. The lesson concludes with a discussion on the practical differences between ladder and structured text, especially around scanning behavior, monitoring, and debugging.

This lesson provides a clear and realistic walkthrough of a real world wash sequence implemented in structured text, helping you understand both the logic and the practical considerations when choosing between ladder and SCL in Siemens TIA Portal.

#AlwaysLearning #Siemens #TIAPortal #Automation #PLC #HMI #TIA #DoAndGrow
Siemens TIA Portal – Asset Oriented Programming - Structuring Sequences In SCL
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Latest Tip

When a Function Block is called, input values are When a Function Block is called, input values are copied from the calling environment into the block. Any changes made to those inputs exist only inside the block during execution.

Outputs work in the opposite direction. The block writes to its outputs internally, and once execution finishes, those values are copied to the external variables connected to them.

This means outputs do not track external changes after execution. If another part of the program modifies the same variable later, the Function Block does not automatically see that change.

Recognizing this copy behavior helps prevent incorrect assumptions about data flow and avoids logic that appears to work inconsistently across scans.

Watch more about this in The Complete Guide To TIA Portal V20 on YouTube: https://www.youtube.com/watch?v=VLO4iY9zqvY

#AlwaysLearning #Siemens #TIAPortal #Automation #PLC #HMI #DoAndGrow

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PLC Automation Consultancy & Training | Liam Bee

Learn PLC automation properly, through structured courses, deep technical guides, and industrial consultancy.

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