Communication
3.2 Communication services
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
3-21
Blocks PROFINET IO PROFIBUS DP
SFB 52/53 (read/write data
record)
Yes Yes
SFB 54 (evaluate interrupt) Yes Yes
SFC102 (read predefined
parameters)
No (replacement: SFB81) Yes
SFB 81 (read predefined
parameters)
Yes Yes
SFC5 (query start address of a
module)
No (replacement: SFC70) Yes
SFC 70 (query start address of
a module)
Yes Yes
SFC49 (query the slot belonging
to a logical address)
No (replacement: SFC71) Yes
SFC 71 (query the slot
belonging to a logical address)
Yes Yes
The following table provides you with an overview of the system and standard functions for
SIMATIC, whose functionality must be implemented by other functions when converting from
PROFIBUS DP to PROFINET IO.
Table 3-7 System and Standard Functions in PROFIBUS DP that must be Implemented with
Different Functions in PROFINET IO
Blocks PROFINET IO PROFIBUS DP
SFC 55 (write dynamic
parameters)
No
(simulate via SFB 53)
Yes
SFC 56 (write predefined
parameters)
No
(simulate via SFB 81 and SFB
53)
Yes
SFC 57 (assign module
parameters)
No
(simulate via SFB 81 and SFB
53)
Yes
You cannot use the following SIMATIC system and standard functions with PROFINET IO:
• SFC 7 (trigger hardware interrupt on DP master)
• SFC 11 (synchronize groups of DP slaves)
• SFC 72 (read data from a communication partner within local S7 station)
• SFC 73 (write data to a communication partner within local S7 station)
• SFC 74 (abort an existing connection to a communication partner within local S7 station)
• SFC 103 (determine the bus typology in a DP master)
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