Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 255)

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DMS 3.2 EN 02/2011 TD29 253
For Global Variables (g) and Global Constants (gc) an additional prefix + underscore is
attached to the library prefix:
Examples:
VAR_GLOBAL
CAN_g_iTest: INT;
END_VAR
VAR_GLOBAL CONSTANT
CAN_gc_dwExample: DWORD;
END_VAR
User-defined data types (DUT)
The name of each structure data type consists of a library prefix (Example: CAN), an
underscore and a preferably short expressive description (Example: SDOTelegram) of
the structure. The associated prefix for used variables of this structure should follow
directly after the colon.
Example:
TYPE CAN_SDOTelegram : (* prefix: sdo *)
STRUCT
wIndex:WORD;
bySubIndex:BYTE;
byLen:BYTE;
abyData: ARRAY [0..3] OF BYTE;
END_STRUCT
END_TYPE
Enumerations start with the library prefix (Example: CAL), followed by an underscore
and the identifier in capital letters.
Regard that in previous versions of PLC Designer ENUM values > 16#7FFF have caused
errors, because they did not get converted automatically to INT values. For this reason
ENUMs always should be defined with correct INT values.