Siemens SIMATIC ET 200AL, System Manual

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Communication with the redundant system S7-1500R/H
14.1 System IP addresses
Communication
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Function Manual, 05/2021, A5E03735815-AJ
14.1 System IP addresses
The system IP address of the S7-1500R/H redundant system
In addition to the device IP addresses of the CPUs, the S7-1500R/H redundant system
supports system IP addresses:
•
System IP address for the PROFINET interfaces X1 of the two CPUs (system IP-address X1)
• System IP address for the PROFINET interfaces X2 of the two CPUs (system IP-address X2)
You use the system IP addresses for communication with other devices (for example, HMI
devices, CPUs, PCs). The devices always communicate via the system IP address with the
primary CPU of the redundant system. This ensures, for example, that the communication
partner can communicate with the new primary CPU (previously backup CPU) in the RUN-Solo
system state after failure of the original primary CPU in redundant operation.
There is a virtual MAC address for each system IP address.
You enable the system IP addresses in STEP 7.
Advantages of the system IP addresses compared to device IP addresses
• The communication partner communicates specifically with the primary CPU.
• Communication of the S7-1500R/H redundant system via a system IP address still also
works in the event of the failure of the primary CPU.
Applications
You use the system IP addresses for the following applications:
•
HMI communication with the S7-1500R/H redundant system: You can use an HMI device
to control or monitor the process on the redundant S7 1500R/H system.
• Open User Communication with the S7-1500R/H redundant system:
– Another CPU or an application on a PC accesses data of the S7-1500R/H redundant
system.
– The S7-1500R/H redundant system accesses a different device.
TCP, UDP and ISO-on-TCP-connections are possible.
• IP forwarding: If you use the system IP addresses as the gateway/default route for IP routes
through the S7-1500R/H redundant system, IP packets are forwarded even if one CPU fails.
Requirements
• The interface of the communication partner is connected to both CPUs, each via the same
interface (e.g. X2).
• The system IP address for the interfaces of the S7-1500R/H system is enabled.