HMI (human-machine interface)
The screen, panel, or software an operator uses to watch a machine or process and adjust its controller.
The network analogy
A management console for the process: operators read status and change setpoints through it, while the controller does the actual control.
Why it matters for wireless
ODVA's wireless guidance notes that a tablet used for dashboards is unlikely to stop the process if it loses communication and can be treated more like an IT asset. That distinction matters when HMI traffic shares a channel with control traffic.
NIST defines an HMI as the hardware or software through which an operator interacts with a controller, from a panel of buttons and lights to an industrial PC with graphics. Operators use it to monitor and configure set points, control algorithms, and parameters. In PROFINET, an HMI used for commissioning or diagnostics acts as an IO supervisor.
Not every HMI is equally tolerant of loss. Find out what each one carries before you decide how to treat it on the air.
About this page
Built from 4 sources: 2 standards bodies and labs and 2 protocol owners and alliances. Researched and drafted with AI assistance, then reviewed and approved by Ben Rutter on . How pages are made
- First published
- Last updated
Cite this page
Plain
Ben Rutter. "HMI (human-machine interface)." OT Wireless, published October 5, 2026. https://otwireless.com/glossary/hmi/
APA 7
Rutter, B. (2026, October 5). HMI (human-machine interface). OT Wireless. https://otwireless.com/glossary/hmi/
BibTeX
@misc{rutter2026hmi,
author = {Rutter, Ben},
title = {{HMI (human-machine interface)}},
year = {2026},
howpublished = {\url{https://otwireless.com/glossary/hmi/}},
organization = {OT Wireless},
}