Level 3 is where systems that support plant wide control and monitoring functions reside. At this level, the operator is interacting with the overall production systems. Think of centralized control rooms with HMIs and operator terminals that provide an overview of all the systems that run the processes in a plant or facility. The operator uses these HMI systems to perform tasks such as quality control checks, managing uptime, and monitoring alarms, events, and trends.
Level 3, site operations, is also where the OT systems that report back up to IT systems in level 4 live. Systems in lower levels send production data to data collection and aggregation servers in this level, which can then send the data to higher ...
