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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

17421

Flash Write Error (Boot Project) (Warning)

ABB · PB610 Panel Builder 600 Programming Software

What does 17421 mean?

A flash write error occurred during the writing of the boot project on the SM560-S Safety CPU. This is a warning indicating potential issues with the non-volatile memory of the Safety PLC, affecting its boot sequence.

Common Causes

  • An error occurred while writing to the boot project section of the flash memory.
  • Flash memory corruption.
  • Hardware fault in the flash memory controller.
  • Power interruption during boot project write.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Review system logs for more details on the flash write operation.

  2. 2

    Attempt to re-download the boot project to the Safety PLC.

Browse all codes in this manual (58)
Verified technical data. Last updated: April 2026

Related Faults

1Safety Destination Address Not Valid (V2 CPU)10Parameter F_SIL Exceeds Specific Application SIL (V2 CPU)11Safety Watchdog Time Zero (V2 CPU)
Source: ABB PB610 Panel Builder 600 Programming Software
Open Manual (Page 458)Search more codes in this manual