They worked around the failures in their critical system because, at one time, there was no other choice. Instead, smaller utilities and businesses simply learned to live with the consequences of downtime. Mostly because, in the past, the equipment and infrastructure required to harden an industrial system were prohibitively expensive. In industrial systems, “mission critical” was traditionally synonymous with big. The downstream, knock-on effect of a system outage may introduce errors and defects in the items being produced, possibly going unnoticed. In the automation world, many systems that are small in scope can still be critical in nature. A string of Christmas lights hanging from 100 carabiners is not. Is it the size of the system that dictates its criticality? No, the life of one rock climber is precious. But at its most simple level, one carabiner must be able to hold one person. In this way they can create an extended redundant system that can support multiple people.
As they make their way up a rockface, they hammer in a piton, attach the carabiner and pass through a rope. For example, climbers use them as part of a safety system that includes pitons, harnesses, and rope. High Reliability Isn’t Just for Large Systemsįor those who don’t spend a lot of time hanging from ropes, a carabiner is a simple metal shackle that allows users to connect one thing to another quickly and securely.
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