SYMINFOSTRUCT

TwinCAT PLC symbol information.

TYPE SYMINFOSTRUCT :
STRUCT
    symEntryLen  : UDINT;
    idxGroup     : UDINT;
    idxOffset    : UDINT;
    byteSize     : UDINT;
    adsDataType  : ADSDATATYPEID;
    symDataType  : T_MaxString;
    symComment   : T_MaxString;
END_STRUCT
END_TYPE

Value	Meaning
symEntryLen	The actual length in bytes of the symbol entry in the symbol table. The symbols are stored in a symbol table. The length of the individual entries is variable, and depends on the length of the symbol name, the type name and the comment.
idxGroup	The index group of the symbolic variables
idxOffset	The index offset of the symbolic variables
byteSize	The amount of memory, in bytes, actually occupied by the value of the symbolic variables. A boolean PLC variable, for instance, occupies one byte, while a string with 20 characters in fact occupies 21 bytes (20 bytes for characters plus one byte for the null marking the end of the string).
adsDataType	The ADS data type ID. (type: ADSDATATYPEID) This type name is used for ADS access to symbolic variables. All PLC structures and arrays (user-defined data types) have the ADS data type name: ADST_BIGTYPE and can not be identified through this data type constant. In order to be able to identify the user-defined data types, use the symDataType variable, or read the base type of the individual variables in the structure.
symDataType	The data type name of the symbolic variable as a string. For example, the type name of a PLC data structure defined by the user (type: T_MaxString, max. 255 characters).
symComment	A comment on the symbolic variable that the user has added to the PLC variable definition line (type: T_MaxString, max. 255 characters).

Requirements

Development environment	Target platform	PLC libraries to be integrated (category group)
TwinCAT v3.1.0	PC or CX (x86, x64, Arm^®)	Tc2_Utilities (System)