Application and functions
1.4 Performance data and behavior in operation
CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10
13
Execution times of the program blocks for PROFIBUS DP
The following table will help you to calculate the CPU cycle times (OB1) in DP master mode.
The table contains the execution time of the program blocks (DP_SEND, DP_RECV)
required for DP processing on the S7-300 / C7-300 CPU.
Explanation / guideline values
Execution time on the CPU
314C-2DP (6ES7 314-6CF00-
0AB0)
Per DP_Send block call:
• <3.0 ms at 8 bytes
• <5.0 ms at 2160 bytes
1)
Per DP_RECV block call:
• <3.3 ms at 8 bytes
• <5.8 ms at 2160 bytes
1)
Execution time on the CPU 317-
2PN/DP (6ES7 317-2EJ10-
0AB0)
Per DP_SEND block call:
• <1.5 ms at 8 bytes
• <2.3 ms at 2160 bytes
1)
Per DP_RECV block call:
• <1.7 ms at 8 bytes
• <2.8 ms at 2160 bytes 1)
the following applies at data lengths > 240 bytes: The data is transferred segmented over several
Note
Time values are guidelines
The times shown for DP master mode should only be considered as guideline values. The
values apply only for a mono master configuration when no other services (for example PG
functions) are processed on the CP.
Note
DP master mode and S7 slaves (ET-200)
You will find important information on using and configuring (importing the GSD file) S7
slaves (ET200) when operating the CP as DP master on the Internet under the followin
g
https://support.industry.siemens.com/cs/ww/en/view/21628502)
Characteristic data of the DP interface / DP slave
General characteristic data
The following characteristic data is important for successful data transfer from the DP master
to the DP slave:
Generic station de-
scription (GSD)
Depending on the CP type, use the following GSD files:
CP 342-5 (6GK7 342-5DA02-0XE0)
CP 342-5 (6GK7 342-5DA03-0XE0)
CP 342-5 FO(6GK7 342-5DF00-0XE0)
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