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Safety Semantic Error: The defined FB instance '...' is never used.

An FB instance is declared in the variables table of a safety-related POU but not called in the code. Any declared FB instance must be inserted into a safety-related code network.

Remedy:
  1. Double-click the error in the Error List to jump to the suspected variables table (where the declaration is marked).
  2. Insert the FB instance into a safety-related code network or delete the instance declaration in the variables table.