Pepperl+Fuchs FieldConnex Segment Coupler 3 Manual page 46

PROFIBUS Power Hub Segment Coupler 3 (SK3)
Operation
If a secondary gateway is plugged into the motherboard its built-in slave boots and takes over
all configurations from the primary gateway.
Note: The reinstalled gateway normally takes all configurations from the primary gateway. Any
previous configurations of the new gateway are overwritten!
The primary and secondary built-in slaves are synchronized with each other.
If a gateway is separated from the redundant motherboard, the primary device issues the
following diagnostic message: "Redundancy not available, redundancy partner missing".
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