Variant" Pointer Data Type - Siemens S7-1200 System Manual

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PLC concepts

4.4 Data types

Hexadecimal code

Hexadecimal code

"Variant" pointer data type

The data type Variant can point to variables of different data types or parameters. The

Variant pointer can point to structures and individual structural components. The Variant

pointer does not occupy any space in memory.

Properties of the Variant pointer

Representation

Data type encoding in the ANY pointer

Memory area encoding in the ANY pointer:

DB_name.Struct_name.element_name

DB_number.Operand Type Length

Null pointer

Bytes, 8 Bits

8-bit character

16-bit-integer

8-bit-integer

16-bit unsigned integer

8-bit unsigned integer

32-bit double word

32-bit double integer

32-bit-unsigned double integer

32-Bit floating point

Character string

Input memory area

Output memory area

Marker memory area

Instance data block

Previous local data

Example entry

MyDB.Struct1.pressure1

P#DB10.DBX10.0 INT 12

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG