F 8627X (0650)
400
7 Address mapping of the BUSCOM variables
7.1 Data types of BUSCOM variables
Overview, how the BUSCOM variables are represented and stored.
Table 17: Data type definitions
All 2 Byte data types configured in ELOP II as BUSCOM variables are transmitted as WORD.
1 Byte data types (e.g. Byte, SINT) must be packed into BUSCOM variables of data type
WORD (e.g. with the function blocks "Pack" and "Unpack") such that they can be transmitted.
7.2 BUSCOM address of the F 865x central module
The user can set-up the BUSCOM Addresses of the BUSCOM variables by specifying the
base and relative addresses in ELOP II.
The addresses of the BUSCOM variables are calculated on the central module F 865x as fol-
lows:
Base address + Relative address = BUSCOM address
The relative address must be set such that the BUSCOM address is located in the same range
as the corresponding base address (see Table 18).
The BOOL and WORD variables are stored within the import and export areas of the F 865x
and further seperated into 0 and 1 areas.
ELOP II
(variable data types)
Process data mapping
on the F 8627X
Size of data types
on the F 8627X and F 865x
BOOL BOOL 1 Byte
WORD (WORD
INT
UINT)
WORD 2 Bytes
Note The base address' settings are located in resource's properties. In the
"BUSCOM" tab, the user can set the base address separately for
Import, Export and Import/Export; however, using the standard base
address settings is recommended.
Ranges
BOOL
(BUSCOM address)
WORD
(BUSCOM address)
Import range 0 (Base address 0000) 0000 to 2047 0000 to 2047
Import range 1 (Base address 4096) 4096 to 8191 4096 to 8191
Export range 0 (Base address 0000) 0000 to 2047 0000 to 2047
Export range 1 (Base address 4096) 4096 to 8191 4096 to 8191
Table 18: BUSCOM variable ranges in the F 865x central module
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