Siemens SIMATIC ET 200AL, System Manual

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Functions
5.5 Real-time communication
PROFINET with STEP 7
204
Function Manual, 05/2021, A5E03444486-AL
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 5-56 I-device connection over 2nd PNIO interface
• Distribution by automation tasks:
– For automation tasks with high performance and deterministic requirements, use
PROFINET with IRT over the X1 interface.
– 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(F)-2 PN
• CPU 1516(F)-3 PN/DP
• CPU 1516T(F)-3 PN/DP
• CPU 1516(F)pro-2 PN
You can find additional information in the section PROFINET interface (Page 1) and in the
Cycle and Response Times ( https://support.industry.siemens.com/cs/ww/en/view/59193558 )
function manual.