E0030: a method or variable its access specifier keeps from here

A method, or a variable of a CLASS’s or FUNCTION_BLOCK’s VAR section, is used where its access specifier does not let it be (Ed.3 6.6.5.9, 6.6.5.10):

• PUBLIC: anywhere the type can be used.
• PROTECTED: in the type itself and the types derived from it. A method or VAR section without a specifier is PROTECTED (Ed.3; OO.md D1), where CODESYS and TwinCAT make it PUBLIC.
• PRIVATE: in the type itself only.
• INTERNAL: in the type’s namespace.

CLASS Counter
  METHOD Count     (* PROTECTED: no specifier *)
  END_METHOD
END_CLASS
...
c.Count();         (* E0030 *)

Write METHOD PUBLIC Count to call it from outside; VAR PUBLIC for a variable read or written from outside, as c.limit.