IEC 62279:2015

Overview

IEC 62279:2015 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies the process and technical requirements for the development of software used in railway control and protection systems. Targeted at programmable electronic systems with safety implications, this standard addresses software development for various architectures, including dedicated microprocessors, programmable logic controllers (PLCs), multiprocessor distributed systems, and central processor systems.

The 2015 edition introduces important updates, such as enhanced software management and organizational requirements, the definition of roles and competencies, deployment and maintenance procedures, and the integration of tool requirements based on IEC 61508-2:2010. IEC 62279:2015 must be read in conjunction with IEC 62278:2002, which defines the generic process for railway control and protection system development.

Key Topics

• Software Safety Integrity Levels (SILs) IEC 62279 outlines the assessment and conformance criteria related to software safety integrity levels, emphasizing risk reduction strategies vital in railway environments where safety is paramount.

• Software Management and Organization The standard defines clear organizational structures, roles, and responsibilities required for managing software projects effectively. It highlights personnel competence requirements to ensure qualified teams oversee safety-critical software development.

• Lifecycle and Documentation Requirements Rigorous documentation mandates cover every phase of the software lifecycle including planning, design, implementation, verification, validation, deployment, and maintenance-ensuring traceability and accountability.

• Software Assurance and Quality It provides comprehensive guidance on software testing, verification, validation, assessment, and quality assurance protocols. Change management and configuration control processes are integral to maintaining software integrity over time.

• Support Tools and Languages IEC 62279 includes requirements for tools employed during software development to guarantee their suitability and dependability in safety-critical railway applications.

• Generic Software and Application Data Development The standard differentiates between generic software components and configurable application data or algorithms, detailing development processes and validation to ensure both meet stringent safety criteria.

Applications

IEC 62279:2015 applies directly to any railway system software that impact control and protection functionalities where safety is critical. The standard is essential for:

• Railway Signalling Systems Ensuring reliable software in systems managing train movements and signaling to prevent accidents and ensure efficient rail traffic.

• Communication Systems for Railways Defining safe software protocols and operations in railway communication networks crucial for coordination and control.

• Train Control Systems Developing embedded software for programmable electronic systems that control train operations and safety mechanisms.

• Maintenance and Deployment Processes Establishing robust procedures for the ongoing maintenance and software updates in railway control infrastructure without compromising safety.

Organizations developing railway control and protection software use IEC 62279:2015 as a benchmark to fulfill safety certification requirements and to align with global best practices in software engineering for railway safety.

Related Standards

• IEC 62278:2002 Provides overarching processes for railway control and protection system development, to be used in conjunction with IEC 62279 for software specifics.

• IEC 61508-2:2010 Focuses on the functional safety of electrical/electronic systems and informs tool requirements for software development under IEC 62279.

• EN 50128 A European standard closely related to IEC 62279, which also deals with software for railway control and protection systems focusing on software development life cycles and safety.

Practical Value

Adhering to IEC 62279:2015 helps railway organizations:

• Implement consistent and standardized software development processes in safety-critical railway environments.
• Ensure compliance with international safety regulations reducing risks in railway operations.
• Improve software quality and reliability through systematic testing, validation, and verification activities.
• Define clear roles and competencies enhancing organizational efficiency and accountability.
• Manage software deployment and maintenance with established procedures to maintain safety integrity over system life.

This standard is indispensable for railway manufacturers, system integrators, and software developers focused on enhancing the safety, reliability, and interoperability of railway control and protection software systems worldwide.