what is a human machine interface
HMI. HMI (Human Machine Interface) is a User Interface where interaction between a human and a manufacturing or process control system occurs. The HMI provides graphics-based visualization of a control system.The outcome of interaction with an HMI is effective operation and control of a process.he HMI provides graphics-based visualization of a control system. The outcome of interaction with an HMI is effective operation and control of a process.