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Application and functions
1.4 Performance data and behavior in operation
Characteristic
Size of the DP data
areas
Min. slave interval
SYNC / FREEZE
User parameter assignment data
User diagnostics data
Note
Fail-safe
Fail-safe mode is possible only if you use the GSD files listed in the table above.
Execution times of the program blocks for PROFIBUS DP
The following table will help you to calculate the CPU cycle times (OB1) in DP slave mode. The
table contains the execution time of the FCs (FC DP_SEND, FC DP_RECV) required for DP
processing on the S7-300 / C7-300 CPU.
Component
Execution time on the CPU
314C-2DP (6ES7 314-6CF00-
0AB0)
Execution time on the CPU 317-
2PN/DP (6ES7 317-2EJ10-0AB0)
Note
Time values are guidelines
The times shown for DP slave mode should only be considered as guideline values. The values
apply only when no other services (for example PG functions) are processed on the CP.
14
You will find GSD files on the Internet at the following address:
Link: (https://support.industry.siemens.com/cs/ww/en/view/113652)
DP input area
DP output area
CP 342-5 (6GK7 342-5DA03-0XE0)
Explanation / values
Per DP_SEND block call:
•
<3.0 ms at 8 bytes
•
<5.0 ms at 240 bytes
Per DP_SEND block call:
•
<1.5 ms at 8 bytes
•
<2.3 ms at 240 bytes
Explanation / values
240 bytes max.
240 bytes max.
0.6 ms
Is supported
3 bytes; value: 40 00 00 (fixed)
0 bytes
Per DP_RECV block call:
•
<3.3 ms at 8 bytes
•
<5.8 ms at 240 bytes
Per DP_RECV block call:
•
<1.7 ms at 8 bytes
•
<2.8 ms at 240 bytes
Equipment Manual, 01/2023, C79000-G8976-C146-11
CP 342-5
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