BECKHOFF ET9300 - Manual (Page 45)

Application Note ET9300 43
Example: Object name (Object Code ARRAY)
UCHAR ArrObjName[] = "Array Obj";
Example: Object name (Object Code RECORD)
UCHAR RecObjName[] = "Record Obj\000First Entry\000Second Entry\000Third
Entry\000\377";
7.5 Object description
The object description connects all object characteristics in one type “TOBJECT” (structure
“OBJECT”). The member variables of OBJECT are listed in
Table 5.
Table 5: "TOBJECT" member variables
Member Data type Description
Prev Entry struct OBJECT Pointer to previous dictionary entry.
Only available if the object dictionary entries
are dynamic linked (STATIC_OBJECT_DIC
= 0).
Next Entry struct OBJECT Pointer to next dictionary entry.
Only available if the object dictionary entries
are dynamic linked (STATIC_OBJECT_DIC
= 0).
Index unsigned 16 bit Object index of the described object. The
object value depends on the type of
EtherCAT slave and object usage (7.6Index
Ranges)
ObjDesc TSDOINFOOBJDESC (32 bit)
Data Type unsigned 16 bit Includes the data type index of the object.
(defined in [2] )
ObjFlags unsigned 16 bit Bit 0-7: Max Subindex (value of subindex 0)
Bit 8-15: Object Code (defined in [2] )
pEntryDesc TSDOINFOENTRYDESC * Pointer to object description. Defined in
“7.3Entry description”
pName unsigned char * Pointer to object name. Defined in
“7.4Object name”
pVarPtr void * Pointer to local memory. Defined in
“7.2Define local memory”
Read Pointer to Read Function. The prototype is
listed below. This function will be called
when an SDO upload is received. If this
pointer is NULL the standard SDO upload
function is executed.
Prototype:
UINT8 ReadFunction (
UINT16 Index,
UINT8 Subindex,
UINT32 Size,
UINT16 MBXMEM * pData,
UINT8 bCompleteAccess )