How does PROFISafe achieve safety?
PROFISafe is the added network protection layer that connects the CPU and I/O layers of safety protection together and provides failsafe network reactions to all faults. These three layer function together to provide a safety control environment for combining safety and automation as discussed below. You still use standard Profibus (or PROFINET) components so it is not a “separate” or “new” network. The safe communication network (PROFISafe) provides the reliability to insure that data passed between the CPU and I/O arrives correctly to the proper partner and is properly interpreted. Amazing as it may seem due to the attention placed on the safety rated communication bus it actually accounts for less that 1% of the risk formula in the safety analysis. Key features of the safety rated bus are fault detection, fault reaction and recovery. A high speed cyclic reading bus like PROFIBUS provided several inherent features that made it a great candidate for the first choice of and open safety
