PROFINET System Redundancy S2
System redundancy relies on the concept of multiple connections to a device to maintain the system in the event of a failure. System redundancy for PROFINET is available in different setups. The S2 functionality, implemented in the Anybus CompactCom 40 PROFINET IRT IIoT Secure, makes it possible for two PROFINET controllers, one primary and one backup, to connect to the device. If the primary controller fails, the backup controller instantly takes over the communication without any disturbance on the network. Running S2 requires specific controllers supporting this feature.
S2 redundancy is enabled in by setting instance #1, attribute #28, in the PROFINET IO Object (F6h), for details see PROFINET IO Object (F6h).