Answer / rajesh j

HMI and MMI denotes devices, but SCADA refers only
software, which can loaded in any computer.
HMI and MMI are one and the same (H-Human and M-Man). Both
gives same meaning. It depends on supplier nomenclature.
But SCADA is an advanced version of this (Its like
difference between MS dos and Unix).

In SCADA, data history can be provided whereas it is
generally not possible to get in MMI or HMI.

HMI and MMI are cheaper and more suitable for small
applications compared to SCADA.

Answer / akanksha

Hey, HMI and MMI are same, Graphical units. You can say,
Hardware Which can give view of system's process. One can
input data from it as well.
Now a days we can have PLC's which have graphical units but
usually process related decision making is not work of
GU,they are only done through if operator decides something.

In case of SCADA we can have all decision making and
Graphic display through it. Hence in that case you can
operate your plant through SCADA or can integrate number of
PLC and HMI in single SCADA to operate from main control
room as supervisory unit.

Answer / parag pathak

First about HMI and MMI:

MMI- Man Machine Interface
HMI- Human Machine Interface

Initailly MMI layer was name given to computers of Control
room to intrface (to view, to modify, to log data) with DCS
system. Later on even ladies started working in process and
control room so they change to Human Machine Interface. HMI
layer consists of many operator consoles and an engineering
console

About SCADA:

SCADA is Supervisory Control amd Data Aquization.. This is
a vendor made program usually for PLC. Initially PLC was
made for dedicated package (AI, DI and DO ) but later on it
was started using for Contols, so it was required to
modify, log the data in the computer so each vendor develop
software compatible with PLC hardware which gives facility
for operator to watch, control and save history of the
process parameters

Answer / komal

HMI & MMI both are same.
HMI is a harware device by whcih we can control the process
by changing status such as ON/OFF, cetpoint etc,
SCADA is a graphical representation of a system which
monitor,control & display data in a process,
For lage scale application we use SCADA & for small scale
application we use HMI.
HMI does not require any communication software while scada
requires it.

Answer / malik shams-ul-arfeen

HMI (Human Machine Interface) and MMI (Man Machine
Interface) are the same and have discussed earlier in
detail.
SCADA (Supervisory Control & Data Acusition) is a software
package which uses aur local control systems (eg. DCS or
PLC) to control or monitor " Our REMOTE location
installations"
If our Field (Hazerdouse area) and Control room (NON
Hazerdouse area) are is same geographical locations then we
dont have any need of SCADA.
But if our field and control room have different
geographical locations (Like main control room of
Offshores, gas plants / supply stations all over the
country etc) then we need SCADA integration with our MCR
control system.

Answer / manikandan - panruti

SCADA: It is a full of software package or visualized
software package.in this we can develop a diagram
(eg:process level.tank level) as per your field instrument
located in your industry.

HMI: It is also give the same meaning but in hmi hardware
part also available. in HMI no need of communication
software but in SCADA it is must(eg:RS-LINX CLASSIC..etc)

MMI:HMI and MMI both are same,earlier this was called MMI
now we are calling HMI.

Answer / ibrahim s

SCADA :- Its a software package which can be installed in
PC to create user defined program.

HMI :- Its an Electronic module with pre installed program
(which can be editable) and control buttons.

But SCADA and HMI doing the same functions.

SCADA & HMI(MMI) refers to a system that collects data from
various field devices to monitor and control the process
variables.

WE ARE HAVING YOKOGAWA CENTUM CS 3000 DCS, 2 FCS AND 4 HIS " When the operation Download to HIS message appears: Equalize start. HIS0163 WARNING: Could not connect to equalize destination. (7001) Retrying. Number of retries = 0/1 ERROR: LdXopsLoadMain: connect error 10060 ERROR: LdXopsLoadMain: connect error 10060 ERROR: Processing terminated due to connection error. (7002) Equalization end with errors. HIS0163 ---- ERROR = 3 WARNING = 1 ---- Tell me, please, why and how to solve the problem."

6 Answers   Khas Pvt Ltd, Yokogawa,

For an Instrumentation Engineer, is there any effect on Instruments of safety zones like zone0, zone1, zone2. As an instrumentation Engineer, what we have to consider or remember while working in these areas.( zones 0,1,2).

1 Answers  

how does we calibrate a square root flow transmitter ,give an example and explain it step by step like range calculation , calibration hook up series connection , zero check , and how to apply pressure , and if not geting proportional output then what should we do ?

0 Answers  

What is the use of keyphasor in turbine.

7 Answers   Hindustan Zinc, R&D,

what is mean by hot loop and cold loop testing, whts different between both

2 Answers   Honeywell, PDO,

Draw a great bridge circuit.

0 Answers   CCIE,

1.what is the role of proportional comtroller in pid controller?2.How do u calibrate the control valve?

3 Answers   Bently, IOCL,

WHEN BOTH WIRES OF THERMOCOUPLE R SHORTED WHAT IS THE OUTPUT THE TEMP ARE 0,30,250,320

13 Answers  

what is diff between sensors and transducers.explain with ex?

15 Answers  

how to calibrate a capillary type level transmitter for a closed tank in field? also what is the procedure for commissioning a capillary level transmitter for a closed tank?

2 Answers  

please anyone suggest me some good intools training institutes with their place and contact nos.

1 Answers   ABB, Thermax,

Why hunting will occour in control valve?

6 Answers