An assessment of PLC-generated alarm notification carried over cellular for industrial sites — evaluating how a controller raises an alarm that reaches a person when there is nobody standing in front of the site and no network worth the name.
The messaging is the easy half. The question worth asking is what happens when the path that carries the alarm is the same path that just failed: a site that has gone quiet and a site that is fine are indistinguishable to anyone waiting on a message that was never sent.
Outcome
An alarm path assessed on its failure modes rather than on its happy path.