Safe communication via SafetyNET p

SafetyNET p can also communicate safety related data through an integrated safe communication layer.
The security mechanisms are designed up to SIL 3 in accordance with IEC 61508. The safety-related data is sent encapsulated within SafetyNET p telegrams. As a result, all other network components such as switches or cable may be standard Ethernet components, which have no impact on safety. Even non-safety related network subscribers such as PCs or standard control systems, for example, have no impact on safety-related communication. As a result it is possible to mix the operation of safety and non-safety-related devices within a network. On SafetyNET p, safety-related objects are stored in a safe object directory, similar to the CANopen object directory.

Safe communication in the OSI reference model
On SafetyNET p, the safe application layer is implemented in Layer 7, the application layer of the OSI reference model. Cyclical, safety-related objects are communicated via safe process data objects (SPDO). SPDOs are mapped on the cyclical data channel, the CDCN, and sent in defi ned intervals. When necessary, acyclical, non-time-critical safety-related data is sent as SSDOs ( safe service data objects) via the MSCN ( Message Channel).