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  • 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: 🔴🔴⭕⭕⭕

    Number of lessons: 29

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In this lesson we walk through the filtration sequence which represents the normal operating mode of the system. This sequence is used as the main ladder logic example to show how all of the sequencing concepts come together in practice.

We start by reviewing the intended operation of the filtration sequence using a flowchart. This highlights how parallel logic is used to continuously monitor shutdown conditions while the main filtration steps are running. Normal shutdowns fault shutdowns and operator stop requests are all handled independently of the main sequence flow.

The lesson then moves into the ladder logic implementation and explains how the sequence is structured rather than focusing only on what it does. Emphasis is placed on step based sequencing using constants for step numbers to make the logic easy to modify and extend later.

Key topics covered in this lesson include

How the filtration sequence is intended to operate
Using parallel logic to monitor shutdown conditions
Separating start and shutdown logic from the main sequence
Using constants for sequence step numbers
Determining start conditions such as fill required or wash required
Calling sub sequences such as fill and wash without blocking the main sequence
Managing sequence interrupts and fault driven shutdowns
Keeping sequence logic focused on enabling actions not performing control
Using interlocks to enable control outside the sequence
Structuring ladder logic sequences for clarity and maintainability

The lesson also demonstrates how subsequences are called and completed without embedding their logic into the main sequence. This allows complex operations such as filling or washing to be reused and managed independently while the parent sequence waits for completion or failure.

By the end of this lesson you will understand how a full ladder based sequence is structured how shutdowns and faults are handled cleanly and why separating control logic from sequence flow makes large systems easier to maintain and adapt in future projects.

#AlwaysLearning #Siemens #TIAPortal #Automation #PLC #HMI #TIA #DoAndGrow
Siemens TIA Portal – Asset Oriented Programming - Structured Sequences In Ladder Logic
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Latest Tip

TIA Portal treats communication functions as logic TIA Portal treats communication functions as logic elements rather than external configuration tools. Communication instructions are inserted directly into blocks using the same workflow as standard logic, which reinforces that data exchange is part of the control program itself.

S7 communication, open user communication, OPC UA, and web related instructions all appear based on the active editor and device capability. Their visibility depends on whether the selected CPU supports the protocol and whether the project context allows insertion at that moment.

Modbus is also integrated into TIA Portal but placed under a general category rather than a dedicated folder. This placement often leads engineers to believe Modbus is missing when in reality the context simply does not expose it yet.

Once this structure is understood, communication stops feeling like a separate engineering task and instead becomes a natural extension of PLC logic design.

Watch more about this in The Complete Guide To TIA Portal V20 on YouTube: https://www.youtube.com/watch?v=pXX8jD81m_U

#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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