Safety instrumented systems and process control systems
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According to the design specifications for safety instrumented systems in the petrochemical industry, for SIL1-level safety instrumented functions, it is advisable to separate the logic controllers from the process control system. But in special cases where the safety level is SIL1 or even lower, is it possible to share the same system for both the safety instrumented system and the process control system?
If it’s a new project, it’s better to develop two separate systems honestly, to avoid various problems down the road. After all, the design regulations are subject to adjustments, and those adjustments tend to be in an upward direction. Who knows whether he might change the character \"yi\" back to \"ying\" in a few years?
It is recommended that the original poster read the relevant content on IEC61511.