Siemens SICAM AK Manual page 16

Redundancy via SCA-RS
•
An update is requested by the user via the FUD
•
An update is carried out automatically for the following changes of state:
─ Going inconsistency of the control parameter
─ Going inconsistency of the Ax-PE parameter
─ Going redundancy synchronizing link failure (if FUDs are consistent)
16
Unrestricted SICAM RTUs, SICAM AK Redundancy
Edition 10.2016, DC2-026-2.07