Configuration
9.2 Configuring R/H CPUs
S7-1500R/H redundant system
292 System Manual, 01/2024, A5E41814787-AF
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 device IP
address.
4. Apply or assign a virtual MAC address to the system IP address.
The virtual MAC address is 6 bytes long. The assignment of the bytes is hexadecimal.
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 9-4 System IP address
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).
4. Setting the cycle monitoring time
STEP 7 assigns default values for the minimum and maximum cycle times.
The default values are displayed in the "Cycle" area of the CPU properties.
Select the maximum cycle time as high as your process allows.
The time for the ongoing synchronization of the two CPUs in redundant operation is
included in the cycle time.
A temporary increase in the cycle time can occur upon a system state transition SYNCUP
→ RUN-Redundant.
If only one CPU controls the process (RUN
-Solo system state), the cycle time is significantly
shorter than during redundant operation.
You can find more information on the cycle time and recommendations for parameterization
of the maximum cycle time and the minimum cycle time in the Cycle and response times
function manual (https://support.industry.siemens.com/cs/at/fr/view/59193558).
You can find information on system states in the section Operating and system states
(Page 380).
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