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• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  C.3 Usage of OPC UA safety Variables in Connections
  Safety provides an application protocol using safety Variables , which is implemented by the SafetyProvider / SafetyConsumer . The communication layer is completely unaware that safety data is being transported. Any logical connection ... this example, all output Variables, including the data related to the SafetyProvider and SafetyConsumer, share the same NetworkMessage . Figure C.4 - Example of a logical connection with bidirectional safety data exchange