Overview
IEC 61158-3-17:2007 is part of the IEC 61158 fieldbus series and provides an abstract, service-level definition of the Type 17 fieldbus data-link layer. It specifies the externally visible services offered to the application layer and systems management for time‑critical messaging in industrial automation. The document defines the primitive actions and events, their parameters and formats, and the valid sequences and interrelationships between them. This edition (2007) supersedes earlier parts of IEC 61158-3 and replaces IEC/PAS 62405:2005.
Key topics
- Data-link layer service model (Type 17) - conceptual description of services between application and data-link layers.
- Time-critical communications - services suited to operations with defined time windows and deterministic requirements.
- Primitives, events and parameters - formal list and definitions of primitives (e.g., CREATE, DELETE, BIND, UNBIND, UNITDATA, SET, GET, ACTION, EVENT), their associated parameters and expected formats.
- Sequence and state behavior - valid primitive sequences, state transitions and interrelationships for a DLSAP (Data-Link Service Access Point).
- DLSAP management service - lifecycle management of service endpoints (create, bind, unbind, delete).
- Connectionless-mode data-link service - unit data transfer primitives, addressing, quality-of-service considerations and timing behavior.
- DL-management service - configuration and management primitives (set/get/action/event) for operational control and diagnostics.
- Network structure & addressing - conceptual overview of how Type 17 addresses and network components relate within the fieldbus reference model.
- Scope & limitations - abstract service definition only; it is not a formal programming API or an implementation specification. Implementation details (octet ordering, exact sizes, correlation rules) are intentionally out of scope.
Applications
- Design and specification of Type 17 data-link protocols for industrial fieldbus systems.
- Providing a reference service model for protocol developers to ensure deterministic, time‑critical messaging.
- Basis for DL‑programming‑interfaces and vendor/device interoperability guidelines (requires separate implementation-level definition).
- Useful for systems requiring safety‑relevant or real‑time communications where deterministic behavior is essential (e.g., process control, factory automation, motion control).
Who should use this standard
- Protocol architects and implementers designing Type 17 data-link protocols.
- Device and equipment manufacturers targeting interoperability on Type 17 fieldbuses.
- System integrators and automation engineers evaluating or specifying time-critical communication solutions.
- Standards bodies and testers mapping conformance between protocol implementations and the abstract service model.
Related standards
- IEC 61158 series (other parts for physical, application and protocol types)
- IEC/TR 61158-1 (fieldbus reference model)
- IEC 61784 (protocol profiles and combinations)
- ISO/IEC 7498-1 and 7498-3 (OSI Basic Reference Model)
- Historical: IEC/PAS 62405:2005 (replaced)
By defining the Type 17 data-link service at an abstract level, IEC 61158-3-17:2007 supports consistent development of deterministic fieldbus protocols and helps stakeholders design reliable, time-critical industrial networks.