An HMI (Human-Machine Interface) is the operator screen that displays live process data and allows interaction with automated systems, connecting operators to PLCs and SCADA on the plant floor.
Definition
An HMI (Human-Machine Interface) is the screen-based interface that allows operators to monitor and interact with automated processes , viewing live process data, adjusting setpoints, acknowledging alarms, and initiating control actions. HMIs are connected to PLCs and SCADA systems and sit physically on the plant floor. In modern manufacturing, HMIs are increasingly software-based (running on industrial PCs or tablets) rather than dedicated hardware panels.
What this means when you're hiring
HMI development and design skills appear in automation and SCADA engineering roles at every level. The key competencies I look for are: platform experience (Siemens WinCC, Rockwell FactoryTalk View, Wonderware InTouch), adherence to ISA-101 HMI design standards, and an understanding of UX for industrial environments , because a poorly designed HMI creates operator error and safety risk.
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