Communication
3.2 Communication services
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
3-21
Comparison of the System and Standard Functions of PROFINET IO and PROFIBUS DP
For CPUs with an integrated PROFINET interface, the table below provides you with an
overview of:
• System and standard functions for SIMATIC that you may need to replace when
converting from PROFIBUS DP to PROFINET IO.
• New system and standard functions
Table 3-6 New System Standard Functions of PROFINET IO and PROFIBUS DP and Those That
Must Be Replaced
Blocks PROFINET IO PROFIBUS DP
SFC13 (read diagnostic data of
a DP slave)
No
Substitute:
• event-related: SFB 54
• state-related: SFB 52
Yes
SFC58/59 (write/read data
record in I/O)
No (replacement: SFB53/52) yes (but should already have
been replaced by SFB53/52 in
DPV1)
SFB52/53 (read/write data
record)
Yes Yes
SFB54 (evaluate alarm) Yes Yes
SFC102 (read predefined
parameters)
No (replacement: SFB81) Yes
new:
SFB81 (read predefined
parameters)
Yes Yes
SFC5 (query start address of a
module)
No (replacement: SFC70) Yes
new:
SFC70 (query start address of a
module)
Yes Yes
SFC49 (query the slot belonging
to a logical address)
No (replacement: SFC71) Yes
new:
SFC71 (query the slot belonging
to a logical address)
Yes Yes
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