Introduction to ISO 25119:2018
ISO 25119:2018, “Tractors and machinery for agriculture and forestry — Safety-related parts of control systems,” is a series of international functional-safety standards applicable to the design and development of all safety-related parts of control systems (SRP/CS) on tractors used in agriculture and forestry as well as on self-propelled ride-on machines and mounted, semi-mounted and trailed machines used in agriculture. The standard can also be applied to mobile municipal equipment, such as street-sweeping machines. It is a sector-specific implementation of the IEC 61508 series of standards and its first edition was published in 2010. The second edition, published in 2018, completely supersedes the previous version and contains significant technical revisions. ISO 25119 Part 2 has been subsequently revised in 2019.
ISO 25119 approach to risk management is based on the determination of the Agricultural Performance Level (AgPL) for each safety-related part of control systems; the AgPL specifies the ability of such parts to perform a safety-related function under foreseeable conditions There are six AgPL: QM, a, b, c, d, and e. The AgPLs a–e correspond to the Performance Levels (PL) a–e of ISO 13849-1:2015 “Safety of machinery — Safety-related parts of control systems.” Thus, AgPL e corresponds to the most critical safety-related functions, i.e., those that have potential for severely life-threatening or fatal injury in the event of a malfunction and that, consequently, require a Probability of Dangerous Failure per Hour (PFHd) less than 10−7.
As software is concerned, ISO 25119 defines how the Software Requirement Level (SRL) is derived from the AgPL. The SRL is categorized into four groups: B, 1, 2, and 3, which correspond to increasingly strict safety goals.
Role of ECLAIR in Ensuring Compliance with ISO 25119:2018
The ECLAIR Software Verification Platform can be used to comply with several of the techniques and measures required by ISO 25119:2018 Part 3 “Series development, hardware and software”. In addition, the ECLAIR Fusa Pack greatly simplifies obtaining all the confidence-building evidence that is required to make a solid argument justifying the use of ECLAIR in safety-related projects.