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    Shawn Tierney commented on lesson Lesson 04: PLC Memory 3 years, 3 months ago

    Good morning Pivotal,

    Thanks for your question.

    STI stands for Selectable Timed Interrupt, and it's used to rung a routine every so many milliseconds.

    Sincerely,

    Shawn Tierney,
    Instructor at The Automation School