6.2.1 General

Subclause 6.2 describes the identifiers, types and structure of the Objects and Methods that are used to implement the OPC UA mappers defined in this document. This implementation serves three purposes:

• support of the safe exchange of SPDUs at runtime

• online browsing, to identify SafetyConsumers and SafetyProviders, and to check their parameters for diagnostic purposes

• offline engineering: the Information Model of one controller can be exported in a standardized file on its engineering system, be imported in another engineering system, and finally deployed on another controller. This allows for a vendor-independent exchange of the communication interfaces of safety applications, e.g. for establishing connections between devices.

Consequently, all type values described in 6.2 are defined as read-only, i.e. they cannot be written by general OPC UA write commands.