IEC 61784-3-14:2010

Overview

IEC 61784-3-14:2010 defines a safety communication layer for functional safety fieldbuses based on CPF 14 (as specified in IEC 61784‑2) and IEC 61158 Type 14. Published by IEC, this profile (often referenced as FSCP 14/1 or EPASafety) specifies services, protocol structures and management objects required to implement a safety-aware communication layer for safety-critical industrial control systems. The bilingual 2012-02 edition corresponds to the original English edition of June 2010.

Key topics and technical requirements

The standard concentrates on the safety communication layer (SCL) and covers:

• Safety PDU and APDU formats: encoding and structure for Functional Safety PDUs (FSPDU) and headers.
• Service and protocol definitions: extended services (e.g., SafetyCommunicationOpen / SafetyCommunicationClose) and state-machine behaviour for periodic and non‑periodic data exchange.
• Integrity and cross-checks: sequence numbers, CRC and CRC‑cross‑check algorithms, feedback messages and hash/check functions to detect communication faults.
• Timing and synchronization: scheduling numbers, time stamps, time expectation margins, time synchronization monitoring and diagnostics.
• Management objects and diagnostics: Functional Safety Communication Management Object, Functional Safety Link Object, safety communication alert object and CSME (communication safety management entity) diagnostics.
• Communication fault handling: alert reporting, configuration management and communication fault report processes.
• System and safety requirements: safety functional requirements, safety measures, installation guidelines, reaction time calculation and maintenance considerations.
• Assessment guidance and annexes: information for assessment, hash function calculation and other informative material for implementers and certifiers.

Applications and who uses it

IEC 61784-3-14 is targeted at systems requiring certified, safety‑rated communication between controllers, safety PLCs, sensors and actuators in industrial environments:

• Control and safety engineers implementing SIL-rated or similar safety functions
• Device manufacturers building CPF 14 / IEC 61158 Type 14 fieldbus interfaces
• System integrators designing safety architectures for machinery and process plants
• Protocol developers and firmware teams implementing SCL services and PDUs
• Certification and assessment bodies evaluating conformance to functional safety communication profiles

Typical applications include safety-related automation in manufacturing, process control, machine safety systems and any environment where deterministic, verified safety communications are required.

Related standards

• IEC 61784 series (communication profiles)
• IEC 61784‑2 (CPF definitions; CPF 14)
• IEC 61158 (fieldbus types - Type 14)
• IEC 61784‑3 (principles for functional safety communications)

Keywords: IEC 61784-3-14, CPF 14, FSCP 14/1, industrial communication networks, functional safety fieldbuses, safety communication layer, IEC 61158 Type 14, EPASafety, safety PDU, CRC, time synchronization.