Siemens Simatic S7-1500R System Manual page 140

3. Assigning system IP addresses
In addition to the device IP addresses of the CPUs, you can also assign system IP
addresses for the S7-1500R/H redundant system.
You use the system IP addresses for communication with other devices (for example, HMI
devices, CPUs, PG/PC). The devices always communicate over 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.
Proceed as follows to activate the system IP address for PROFINET interfaces X1 of the two
CPUs:
1. Select a CPU in the network view. Select the "Properties" tab in the Inspector window.
2. Select the area "PROFINET interface [X1]" and the section "System IP address for
switched communication" in the area navigation.
3. Make sure that the checkbox "Enable the system IP address for switched communication"
is selected for the interface X1. Apply or assign the system IP address in the "IP address"
field.
The subnet mask cannot be modified and corresponds to the subnet mask of the IP
protocol.
4. Apply or assign a virtual MAC address to the system IP address.
The virtual MAC address is six bytes long. The assignment of the bytes is hexadecimal.
Note
Virtual MAC address
Ensure that all MAC addresses stored in the Ethernet broadcast domain are unique. This
applies in particular to systems with third-party devices consisting of VRRP and
redundant systems that are configured through several STEP 7 projects.
5. The other CPU applies the settings automatically.
Figure 6-4
You can find more information on the system IP address in the Communication function
manual (https://support.industry.siemens.com/cs/ww/en/view/59192925).
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
System IP address
Configuration
6.2 Configuration procedure
139