LST EN 61511-1-2005 Functional safety. Safety instrumented systems for the process industry sector. Part 1: Framework, definitions, system, hardware and software requirements (IEC 61511-1:2003 + corrigendum 2004)
2005LST EN 61511-1-2005 Functional safety. Safety instrumented systems for the process industry sector. Part 1: Framework, definitions, system, hardware and software requirements (IEC 61511-1:2003 + corrigendum 2004)