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Safety Semantic Error: Variable with usage type 'Input' is written to.

A variable which is declared as input variable ('Usage = Input') in a function block POU (VAR_INPUT according to the IEC 61131-3 standard) must not be written in the code. Input variables may only be read.

Remedy:

  1. Double-click the error in the Error List to jump to the suspected code worksheet (where the write access to the input variable is marked).
  2. Correct the code by removing the write access.