Communication; System And Device Ip Addresses - Siemens SIMATIC S7-1500 System Manual

System overview

4.4 Communication

4.4 Communication
4.4.1

System and device IP addresses

Device IP addresses
For the interfaces of the CPUs and the IO devices to be accessible, the interfaces require IP
addresses that are unique within the network (device IP addresses).
MAC addresses
The CPUs have a unique MAC address for each interface and its ports. The MAC addresses of
the PROFINET ports are needed for the LLDP protocol, for example for the neighborhood
discovery function.
The number range of the MAC addresses is sequential. The first and last MAC addresses are
printed on the rating plate on the right-hand side of each CPU.
System IP addresses
In addition to the device IP addresses of the CPUs, the redundant system S7‑1500R/H supports
system IP addresses:
• System IP address for the X1 PROFINET interfaces of the two CPUs (system IP address X1)
for CPU 1513R-1 PN, CPU 1515R-2 PN, CPU 1517H-3 PN and CPU 1518HF-4 PN
• System IP address for the X2 PROFINET interfaces of the two CPUs (system IP address X2)
for CPU 1515R-2 PN, CPU 1517H-3 PN and CPU 1518HF-4 PN
• System IP address for the X3 PROFINET interfaces of the two CPUs (system IP‑address X3)
for CPU 1518HF-4 PN
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 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. The virtual MAC addresses of the
PROFINET interfaces must be different.
You enable the system IP addresses in STEP 7.
For information on configuring the system IP addresses and the virtual MAC addresses, refer
to the section Configuring S7-1500R.
Advantages of system IP addresses over device IP addresses
• Targeted communication of the communication partner with the primary CPU.
• The S7‑1500R/H redundant system can continue to communicate over a system IP address
even if the primary CPU fails.
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD