FUNCTION_BLOCK fbd2
  VAR
    X : INT;
  END_VAR
  VAR_EXTERNAL
    GVa : INT;
    GVb : INT;
    GVc : INT;
  END_VAR
  (*
    // Network 1:
    X := GVa+GVb*GVc;
  *)
  @VF(1) : @E(X), @R(380.0, 70.0, 140.0, 19.0);
  @VF(2) : @E(GVa+GVb*GVc), @R(140.0, 70.0, 140.0, 19.0), INT;
  @G(3) :
     @L(@VF(2).o, @VF(1).i)
    ;
END_FUNCTION_BLOCK
geht auch nicht.
Im NonDMA.h steht:
#ifndef LC_PROT_LC3GLOBALSNONDMA__H
#define LC_PROT_LC3GLOBALSNONDMA__H
/* MACROS for GLOBAL VARIABLES (without DMA attribute) */
#define LC_EXT_INIT_ELEM_LC_VD_GVB(ptrEPDB,varName,varType)                               (*(varType*)(&(g_LC3_GVInstanceData.varName)))
#define LC_EXT_INIT_ELEM_LC_VD_GVC(ptrEPDB,varName,varType)                               (*(varType*)(&(g_LC3_GVInstanceData.varName)))
#define LC_EXT_INIT_ELEM_LC_VD_GVA(ptrEPDB,varName,varType)                               (*(varType*)(&(g_LC3_GVInstanceData.varName)))
#define LC_EXT_INIT_ELEM_LC_VD_GVARRAYINDEXFBD(ptrEPDB,varName,varType)                   (*(varType*)(&(g_LC3_GVInstanceData.varName)))
#define LC_EXT_INIT_ARRAY_LC_VD_GVARRAYINTFBD(ptrEPDB,arrName,arrBaseType,arrDimensions)  (*((arrBaseType (*)arrDimensions)(&(g_LC3_GVInstanceData.arrName))))
#endif