Resources
IEC 61511
The IEC standard for use of electrical / electronic / programmable electronic safety-related systems in the process industry. Like IEC 61508 it focuses on a set of safety lifecycle processes to manage process risk. It was originally published by the IEC in 2003 and taken up by the US in 2004 as ISA 84.00.01- 2004. Unlike IEC 61508, this standard is targeted toward the process industry users of safety instrumented systems.