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What is HMI and PLC?

PLCs are industrial digital computers designed to execute real-time control operations in manufacturing and process automation environments. HMIs are graphical user interfaces that control and interact with industrial automation systems. HMI+PLC combinations are devices that consolidate both control processing and operator interface functions within a single compact unit.

What is a node?

In computer networking, a node is any physical or virtual device that is part of a network. This includes hosts like HMIs and PLCs, as well as devices that help manage network traffic, such as routers, switches, and access points.