ISO 25119: The norm describes the safety requirements for tractors and machinery for agriculture and forestry. The standard is a sector specific implementation of IEC 61508 and consists of 4 parts. Like other functional safety standards, ISO 25119 specifies various levels of criticality. The standard defines the Agricultural Performance Level (AgPL) QM, a – e. The AgPL a to e correspond to the Performance Levels (PL) a to e as defined in ISO13849.
Regarding the software, an SRL (Software Requirement Level) is derived from the AgPL. Chapter 7.3.5 in Part 2 of the standard defines the relationship between AgPL and the SRLs (B, 1, 2, 3). Read more