Siemens SIMATIC PROFINET Function Manual page 169

Applications for CPU with multiple PROFINET IO interfaces
● Connecting machines: Your configuration contains machines located on separate IO
lines. You can perform real-time communication between the CPUs over PROFINET IO
interface X2. Use the I-device or shared I-device function for this purpose.
The figure below shows an example configuration for two machines connected over the
X2 interface with an I-device relationship.
Figure 5-51
● Distribution by automation tasks:
– For automation tasks with high performance and deterministic requirements, use
– For other tasks that you can implement with RT, use the X2 interface.
If you use interface X2 as the PROFINET IO interface for one of the following CPUs, this can
affect performance:
● CPU 1515(F)-2 PN
● CPU 1515T-2 PN
● CPU 1516(F)-3 PN/DP
● CPU 1516(F)pro-2 PN
You can find additional information in the section PROFINET interface (Page 23) and in the
Cycle and Response Times (https://support.industry.siemens.com/cs/ww/en/view/59193558)
function manual.
PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG
I-device connection over 2nd PNIO interface
PROFINET with IRT over the X1 interface.
Functions
5.5 Real-time communication
169