What are the industry standards for SIS?
In the past, there were many different standards covering SIS application and use. The dominant standards are ISA S84.01 “Application of Safety Instrumented Systems for the Process Industry ” and DIN 19250/19251. In an effort to harmonize under one standard, and to address the increased use of micro-processor based logic solvers (PLCs) and SMART field devices in SIS loops, the IECTC65 developed two new standards: IEC 61508 “Functional Safety of Electrical / Electronic / Programmable Electronic Safety-related Systems.” This standard is for suppliers of microprocessor-based instrumentation to Process Control, Medical, and Avionics industries. IEC 61511 “Functional Safety: Safety Instrumented Systems for the process industry sector.” This standard is for end-users and engineering firms detailing the requirements for design and implementation of SIS for Process Control Industry. The purpose of these standards is to assist users in reducing risk. Each of these standards detail different lev
