Cellular networks can experience latency changes, short outages and path changes that are unacceptable for real-time safety or control loops. Local PLCs and controllers should continue their core process safely without depending on a distant cloud response.
Use the cellular link for supervision, data collection, configuration and non-time-critical commands. Define safe local states, interlocks and buffers for communications loss. When service returns, data should synchronise without causing duplicate or unsafe actions. This design makes the remote connection valuable without turning it into a single point of process failure.
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Why should time-critical local control remain independent from the cellular backhaul wherever possible?
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