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• OPC-10000-15 – OPC Unified Architecture - Part 15: Safety
  1 Scope
  Scope This document describes a safety communication layer (services and a protocol) for the exchange of SafetyData using OPC UA mechanisms. It identifies the principles for functional safety communications defined ... that are relevant for this safety communication layer . This safety communication layer is intended for implementation in safety devices only. NOTE 1 This document targets controller-to-controller communication. However
• OPC-10000-15 – OPC Unified Architecture - Part 15: Safety
  7.2.2.3 Duration of demand
  demand In case it is necessary to ensure that a given SafetyData (e.g. a safety demand or a command value) that originates in the SafetyProvider 's safety application is being ... received by a SafetyConsumer and forwarded to the SafetyConsumer 's safety application, i.e. if no SafetyData in a series of SafetyData is to be missed, the following two cases shall
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  C.3 Usage of OPC UA safety Variables in Connections
  Usage of OPC UA safety Variables in Connections OPC UA 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 could reference any number of safety and non-safety Variables , even from different SafetyProviders or SafetyConsumers . There is nothing special