24631

Too Many Sequence Tags/Event Buffer Full

Allen-Bradley · Logix 5000 Advanced Process Control and Drives

What does 24631 mean?

The SCMD (Equipment Sequence Command) instruction, specifically a START command, failed because too many sequence parameter or step tags are defined per step. This excessive definition leads to an inability to handle events, likely overwhelming the event processing buffers and preventing the sequence from starting correctly.

Common Causes

  • An excessive number of sequence parameter tags have been defined for a single step in the Equipment Sequence.
  • An excessive number of step tags are defined per step, exceeding system limits or buffer capacities.
  • The event processing buffers are overloaded or full due to a high volume of tag definitions and associated events.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reduce the number of sequence parameter tags defined for each step in the Equipment Sequence.

  2. 2

    Reduce the total number of step tags defined per step to optimize resource usage.

  3. 3

    Optimize the Equipment Sequence design to minimize the generation of events associated with tag definitions.

  4. 4

    Review controller documentation for configurable event processing buffer sizes and adjust if capacity is a known issue.

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Verified technical data. Last updated: March 2026

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Source: Allen-Bradley Logix 5000 Advanced Process Control and Drives