SCADA HMI vs DCS HMI HMIs are primarily used in small-scale automation environments. When you have larger-scale systems, the interface with the plant process is typically a desktop computer. This computer requires its own software package such as Intellution or iFix, Wonderware, or VtSCADA to name a few. While a SCADA system has HMIs or computers that are not necessarily of the same manufacturer, the DCSs have graphical interfaces that are typically integrated within the DCS system. Watch the vi