Answer / jeevana manickam

DCS- means Distribured Control systemm.This is mainly
process oriented system.If we ask the feedbeck from the
system,it will give from the IO field.This is a independent
control systen.

SCADA-means supervisory control and data acquisition
system.This is basically a data gathering system and given
the control based on that datas. This system will depends
PLC or DCS for its control.

Answer / praveen kumar

SCADA is basically Remote area used, and its only data
gathering system and this system will depends on DCS for
controlling.

DCS is independent system, and this system will get
feedback and controlling also, SCADA can be added in DCS.

Answer / khaled

DCS is a system distributed geographically and functionally
within the process areas. It can view and control the
porcess based on information received from process field
instrumentations and can do controlling through the human
machine interface or through logic built in the DCS
controllers.

SCADA, it is mainly a system in which the main controller
exist in the control room (master terminal unit) and
communicating with remote units (remote terminal units)
which gathering information from field
instrumentations.This system also can do controlling
through logic built in the main controller

Answer / asif iqbal

Traditionally, DCSs were large, expensive and very complex
systems that were considered as a control solution for the
continuous or batch process industries. In large systems
this is, in principle, still true today, with engineers
usually opting for PLCs and HMIs or SCADA for smaller
applications, in order to keep costs down.

A correctly designed DCS control system is essential for
the safe and efficient operation of a process plant.
Process Technical Services can provide qualified and
experienced instrument and control system engineers and
technicians that will review the P&I diagrams in detail to
determine if the DCS control system will meet the needs of
your operations.

SCADA Supervisory Control and Data Acquisition systems
which provide automation control over large industrial and
commercial operations providing real-time data transmission
by telemetry from remote location sensors for processing
and analysis resulting in a feedback loop for computerized
control over system operations

Answer / www.islamqa.com

# SCADA always consdered for monitoring and coordination,
but no control.

# DCS for monitoring and control.

# but now with great progress in technology, networking H/W
and telecommunication SCADA is now used in control also and
so the difference between the 2 systems will fade.

Regards,

Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310

pls tell me whethere flame proof HMI's are available or every HMI is manufactured by considering flame proof standard.

3 Answers  

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Need Intergraph softwares like SPI(INTOOLS),sp3d,PV ELITE, SP P&ID. CONTACT : logu.2211@gmail.com (8867825756)

0 Answers   GE,

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if we have 450 mm heigth boiler drum level ,so what is span & zero value for a dpt tranmitter

4 Answers  

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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =

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i hav applied for the post of engg. in iocl so please require the past test papers fro instrumentation engg please please help me and send me the papers or tell me the pattern and type of ques asked in examination......

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Explain the key components of control loop?

0 Answers  

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