Siemens SIMATIC S7-1500 Function Manual page 103

Diagnostics of the S7-1500R/H redundant system
7.1 Online and Diagnostics view
Online & diagnostics for the primary CPU or backup CPU
The Online and Diagnostics view for the CPUs of the redundant system match the display for
standard CPUs.
In the RUN-Redundant system state, the primary and backup CPU display the online data of
the redundant system irrespective of which of the two CPUs the online connection has been
made.
In non-redundant mode, the programming device/PC displays the data of the CPU for which
there is an online connection, i.e. either the primary CPU or of the backup CPU.
You select the CPU for display of the online data in the project tree.
Figure 7-3 Online and Diagnostics view: CPU (RUN-Redundant system state)
Reference
You can find information on the operating and system states in the Redundant System S7-
1500R/H System Manual (https://support.industry.siemens.com/cs/ww/en/view/109754833).
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Function Manual, 11/2019, A5E03735838-AF
Diagnostics