Equivalent enum value used
This message indicates that the assigned enum value is not part of the enum, but is equivalent to one of the internal values of the enum.
Example:
TYPE Colors : (Red, Green, Blue, Yellow) END_TYPE
TYPE Directions : (N, S, W, E) END_TYPE
VAR_GLOBAL
col : Colors := N; //N is equivalent to Red but is not part of the enum
dir : Directions := Red; //Red is equivalent to N but is not part of the enum
END_VAR
To solve the issue, use the equivalent value indicated by the enum