Siemens SIMATIC S7-1500 Function Manual page 113

Diagnostics of the S7-1500R/H redundant system
7.4 Diagnostics in the RUN-Redundant system state
Error in the RUN-Redundant system state
Most errors in the redundant system do not result in a loss of redundancy. The RUN-
Redundant system state is retained, for example, if a module in an IO device fails. The
diagnostics view is similar to the standard S7-1500 systems.
In the RUN-Redundant system state the redundancy of the system can be restricted, e.g.
during the interruption of one of the two redundancy connections in S7-1500H. You can find
information on the redundancy scenarios in the Redundant System S7-1500R/H System
Manual (https://support.industry.siemens.com/cs/ww/en/view/109754833).
Special examples of a redundant system S7-1500H are shown below:
S7-1500H Example 1:
The PROFINET ring between the CPU of the redundant S7-1500H system and an IO device
was interrupted.
Evaluate diagnostics via LINK TX/RX LEDs on the CPU
TX/RX X1 P1 LED is not illuminated. This means:
● No Ethernet connection between the P1 port of the respective PROFINET interface and
the communication partner
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Function Manual, 11/2019, A5E03735838-AF
Diagnostics