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irfanahmedarain
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SCADA Vs HMI

01/08/2011 12:48 PM

Can anybody describe difference between SCADA and HMI?
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lyn
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#1

Re: SCADA Vs HMI

01/08/2011 12:54 PM

Supervisory control and data acquisition vs human machine interface,

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kwcharlie
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#2

Re: SCADA Vs HMI

01/08/2011 1:01 PM

don't you want to know about MMI too?

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lyn
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#3
In reply to #2

Re: SCADA Vs HMI

01/08/2011 1:06 PM

Let's not forget DCS.
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JohnDG
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#4
In reply to #3

Re: SCADA Vs HMI

01/08/2011 4:11 PM

And STD

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#7
In reply to #4

Re: SCADA Vs HMI

01/10/2011 1:34 PM

That's NFG.
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msamad
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#5

Re: SCADA Vs HMI

01/09/2011 10:37 AM

A SCADA System usually consists of the following subsystems:

- A Human-Machine Interface (HMI) or Man-Machine Interface (MMI) which presents process data to a human operator, and through this, the human operator monitors and controls the process.

- A supervisory (computer) system, gathering (acquiring) data on the process and sending commands (control) to the process.

- Remote Terminal Units (RTU) connecting to sensors in the process, converting sensor signals to digital data and sending digital data to the supervisory system.

- Programmable Logic Controller (PLC) used as field devices because they are more economical, versatile, flexible, and configurable than special-purpose RTUs.

- Communication infrastructure connecting the supervisory system to the Remote Terminal Units

You can see the HMI is one of the subsystems or components of the SCADA.

- MS

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#6

Re: SCADA Vs HMI

01/09/2011 11:53 AM

I really didn't want to answer after this last answer in detail. But question should be regarded as question. Comments should be avoid.

DCS and SCADA are on the same level of control hierarchy as compare to HMI which is underneath it.
But this type of question is purely academic type because on practical ground, it is not so straight to define the differences between the two. Anyhow, both are responsible for control as desktop and as enterprise level.
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PWSlack
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#8

Re: SCADA Vs HMI

01/10/2011 1:37 PM

Loads of people can.

Rather than wait for someone to say what it is, try Wikipedia <other on-line encyclopediae are available> instead, perhaps? It will be so much faster.

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Banana86
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#9

Re: SCADA Vs HMI

01/27/2011 11:00 PM

You need to know first the control room location :P

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