Major SIS (safety integrated system) suppliers provide redundant hardware configurations based on 1002 (1 out of 2), 2003, and 2004 configurations. Applications of these configurations are designed to provide a higher level of reliability while simultaneously reducing the probability of a false trip shutting down a process unnecessarily. This discussion reviews how these strategies developed along with a more detailed overview of two redundant architectures commonly applied in large-scale SIS SIL3 applications, namely 2003 and 2004 as applied by Triconex and Honeywell, respectively. These two major companies are only examples as similar hardware configurations are available from other SIS suppliers.
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