System Ip Addresses - Siemens SIMATIC S7-1500 Function Manual

13.1

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
– 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.
Communication
Function Manual, 11/2019, A5E03735815-AH
system.
Communication with the redundant system S7-1500R/H
13.1 System IP addresses
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