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Joined: Oct 2018
Posts: 4
New Member
Knowing the difference between SCADA and HMI…

All this while, we have come across the terms SCADA and HMI, and also seen the details of it. But what about the points of difference between SCADA and HMI? It is important to know it as well. To acquaint you with it, we have dedicated this blog to the same topic.

A SCADA (Supervisory Control and Data Acquisition) System is the one belonging to the Automation or Industrial Control System category, that might consist of directly control or have a communication with one or more of the below:

Data Acquisition Systems (DAQs)
Industrial Cloud Computing Environment
Historians and Data Storage Servers
Networked industrial machines and automation
Remote telemetry along with control using burst or continuous communications
There is a possibility that a SCADA system can be all the time connected to all of the components in the ICS, or on the other hand at times connected to some or all, and updated through a burst communication over radio or cellular modems (2G/3G/4G, GSM and CDMA technologies) to field equipment and devices.

Joined: May 2005
Posts: 984
Likes: 1
SCADA - Supervisory Control And Data Acquisition
HMI - Human Machine Interface

One is a computer...the other is a fancy keyboard.

Simplicity itself.

Joined: Nov 2005
Posts: 826
The Display, Keyboard and Mouse, that I use to program and monitor our SCADA system, is the HMI.
The 3 different synced computers, running the Master Program, all the comm paths, the Remote Terminal Units (RTU), in the field, and the HMI, are all part of the SCADA system. A SCADA system needs to have an HMI, while an HMI doesn't have to be part of a SCADA system.

Joined: May 2005
Posts: 984
Likes: 1

BTW - I think this new guy is a salesman, especially after reading his other post on this site about how wonderful SCADA is.


Ghost: His profile says he is an Electrical Engineer!
John aka Hotline 1

Last edited by HotLine1; 10/17/18 12:08 PM.

Joined: May 2005
Posts: 984
Likes: 1
Hi, John;

People can be more than 1 thing...or can make up answers when filling in a form.

Have you read his latest post trying to get people to enroll in some school in Pune?

Joined: Oct 2000
Posts: 3,669
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