Compact FF Link

The Compact FF Link is a S7‑300 format device, consisting of a PROFIBUS DP interface (DPV1 slave) and a field device coupler for a subordinate FF bus segment. It can operated individually or redundantly in a pair.

The following architectures are thus possible (also refer to "FOUNDATION Fieldbus H1" section under "Design"):

• Single PROFIBUS DP interface (1 Г— Compact FF Link)
  • Line architecture with single Compact FF Link
• Redundant PROFIBUS DP interface (2 Г— Compact FF Link)
  • Line architecture with redundant Compact FF Link pair and AFS active field distributor
  • Ring architecture with redundant Compact FF Link pair (link and media redundancy)

Compact FF Link in non-redundant operation

If the FF segment is connected to PROFIBUS DP via a single Compact FF Link, the Compact FF Link can be mounted directly on a standard mounting rail.

If the 24 V DC incoming supply is not from a central power supply of the plant, a PS 307 or PS 305 load power supply can be used.

Compact FF Links in redundant operation

In a redundant configuration, the BM Compact FF Link bus module is first mounted on a mounting rail for "hot swapping". The two redundant Compact FF Links are then inserted. This enables a Compact FF Link to be replaced during operation.

In the case of a redundant Compact FF Link pair, a redundant 24 V DC supply is also recommended, e.g. with two PS 307/PS 305 load power supplies.