28

Mismatch of Safety Destination Address (F_Dest_Add)

ABB · AC500 Function Block Libraries

What does 28 mean?

A mismatch has been detected in the PROFIsafe destination address (F_Dest_Add) configured for the safety PLC. This indicates that the PLC's intended communication partner cannot be correctly identified or addressed, leading to communication failures and potentially disabling critical safety functions. Incorrect addressing could result in unintended machine behavior.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Perform a controlled restart of the safety PLC.

  2. 4

    If the error persists after verification and restart, prepare for safety PLC replacement.

Source: ABB AC500 Function Block Libraries
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