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Tag: IEC 61131-3

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How-To: Architecting a Bulletproof PLC State Machine for Industrial Sequences

Learning 
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flowchart LR
    classDef init fill:#3b82f6,stroke:#1d4ed8,stroke-width:2px,color:#fff;
    classDef process fill:#10b981,stroke:#047857,stroke-width:2px,color:#fff;
    classDef error fill:#ef4444,stroke:#b91c1c,stroke-width:2px,color:#fff;

    S0["Init State (S0)"]:::init -->|"Start Cmd"| S1["Process Step 1 (S1)"]:::process
    S1 -->|"Done"| S2["Process Step 2 (S2)"]:::process
    S2 -->|"Complete"| S0
    S1 -->|"Fault"| SE["Fault State (SE)"]:::error
    S2 -->|"Fault"| SE
    SE -->|"Reset"| S0
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How-To: Architecting a Bulletproof PLC State Machine for Industrial Sequences

TL;DR: Procedural logic breaks down as complexity grows; a PLC state machine strictly defines operational phases to eliminate race conditions. Decoupling transition rules from output actions is the secret to scalable, maintainable sequencers. Always design for failure: implement dedicated fault states and strict step timeouts to catch mechanical jams before they cause damage. Anyone who […]

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Structured Text vs Ladder Logic: 5 Essential PLC Tips

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%%{init: {'theme':'dark', 'themeVariables': { 'background': '#001c38' }}}%%
flowchart LR
    A{PLC Programming}
    A -->|Visual| B[Ladder Logic]
    A -->|Textual| C[Structured Text]
    B --> D[Machine Sequence]
    C --> E[Data Processing]
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Structured Text vs Ladder Logic: 5 Essential PLC Tips

The Reality of PLC Programming Choices For decades, the factory floor has been dominated by relay-style diagrams. Yet, as automation systems scale to handle array processing, MQTT communications, and multi-axis kinematics, limiting a project to Ladder Logic can severely handicap development speed. Conversely, writing a machine’s main safety sequence entirely in Structured Text can frustrate […]

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