When using the highly available automation system S7-400H, there are two parallel redundant PROFIBUS lines. ibaBM-DP is connected to both lines using the two DP connections Bus0 (X40) and Bus1 (X41).

Up to 8 pairs of active slaves (one slave with the same number on Bus0/1) can be created.

Identical to the system setup with non-redundant PROFIBUS, the device configuration and the recorded data are exchanged with ibaPDA via a bidirectional fiber optic connection.

For further explanations concerning the redundancy mode, please see chapter Redundancy mode.