Siemens CPU 315-2 DP User Manual

Cycle and reaction times
5.3 Response time
CPU 31xC and CPU 31x, Technical Data
5-14 Manual, 01/2006 Edition, A5E00105475-06
DP cycle times in the PROFIBUS DP network
If you have configured your PROFIBUS DP master system in STEP 7, STEP 7 calculates the
typical DP cycle time to be expected. You can then view the DP cycle time of your
configuration on the PG.
The figure below gives you an overview of the DP cycle time. In this example, let us assume
that the data of each DP slave has an average length of 4 bytes.
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With multi-master operation on a PROFIBUS-DP network, you must make allowances for the
DP cycle time at each master. That is, you will have to calculate the times for each master
separately and then add up the results.

Siemens CPU 315-2 DP Specifications

General

Memory	64 KB
Power Supply	24 V DC
Order Number	6ES7 315-2AG10-0AB0
Number of DP Masters	1
Number of DP Slaves	124
Load Memory	64 KB
Number of Timers	256
Number of Counters	256
Data Memory	64 KB
Operating Temperature	0 to 60 °C
Integrated Interfaces	MPI, DP
Digital Outputs	Not integrated
Analog Inputs	Not integrated
Analog Outputs	Not integrated
Programming Languages	LAD, FBD, STL
Digital Inputs	Not integrated
Weight	660 g