Data Sets - Siemens SIRIUS 3RW44 System Manual

PROFIBUS DP Communication Module
8.12

Data Sets

Writing/reading data sets with STEP 7
Further information
Byte arrangements
8-40
You can access the soft starter data sets via the user program.
• Writing data sets:
S7-DPV1 master: By calling up SFB 53 "WR_REC" or SFC 58
S7 master: By calling up SFC 58
• Reading data sets:
S7-DPV1 master: By calling up SFB 52 "RD_REC" or SFC 59
S7 master: By calling up SFC 59
For further information regarding SFBs, please refer to
• the reference manual
"System software for S7-300/400, System and Standard Functions"
• the STEP 7 online help
When data is stored which is longer than one byte, the bytes are arranged as
follows ("big endian")
Byte arrangement
Byte 0 High byte
Byte 1 Low byte
Byte 2 High byte
Byte 3 Low byte
Byte 0 High byte
Byte 1 Low byte
Byte 0 Byte 0
Byte 1 Byte 1
Table 8-16: Byte arrangement in "big endian" format
Data type
High word Double word
Low word
Word
Byte
SIRIUS 3RW44 System Manual
GWA 4NEB 535 2195-02 DS 04