Scada overview

3.  SCADA provides a complete pictorial overview of
the entire plant process with necessary monitoring
and control facilities at a central location
 The control systems are always coupled with Man
Machine Interface (MMI) or Supervisory Control and
Data Acquisition Software
 SCADA software is to be connected to PLC / PID /
DCS systems which in turn are connected to field
instruments

4.  Previously without SCADA software, an industrial
process was entirely controlled by PLC, CNC , PID &
micro controllers having programmed in certain
languages or codes.
 These codes were either written in assembly language
or relay logic without any true animation that would
explain the process running.
 It is always easy to understand the status of the
process if it is shown with some animations rather
than written codes.

5.  It works like a supervisor who supervises the entire
plant area, it also controls the process as well as it
converts the data segments for storing process
values i.e. level, pressure, switch positions, density,
temperature, messages, etc
 From a distant place if we want to run the process
i.e. starting , stopping , opening and closing of field
instruments, resetting alarms, as well as logging the
various values; SCADA can help…

6.  Dynamic process graphic
 Real-time and Historical trending
 Alarms
 Recipe Management
 Security
 Device connectivity
 Script for logic development
 Database connectivity
 Networking

7.  Using this feature, one can develop graphics
which can resemble the plant.
 The graphics can include reactors, valves,
pumps, agitators, conveyors as well as other
equipment and machinery used in the plant.
 The status of the equipment running/stopped
can be shown using different colors/animation.
 Typicallythe SCADA software will have many
ready to use symbols for proper representation
which can be used in any type of industry.

8.  This facility is used for representing the data in
graphical form
 Real-time data will plot the real-time value for fixed
period of time while historical data will have
historical data stored value which can be viewed on
demand
 Depending upon the storing capacity of the hard-
disk one can specify the no of days the data can be
stored

9.  Every plant needs proper monitoring and control of
the process parameters
 Alarms represent warnings of process conditions
that could cause problems, and require an operator
response
 Generally alarms are implemented by using the
lamps or hooters in field but in SCADA it can be
represented using animation.
 In many SCADA software, four type of alarm limits
are used ie HI, HIHI, LOW, LOW LOW

10.  In many cases we use the same plant for
manufacturing different product range. For example
an oil blending plant can manufacture power oil,
transformer oil, automobile oil.
 The recipe management is facility used for maintain
various recipes of different products and implement
it on the process
 The recipe can be stored in a single server and it can
be fetched by any client server from any area to run
the process

11.  Every SCADA software has various levels of security
for securing the application by avoiding
unauthorized access
 Depending upon the access level given the
operator/engineers is allowed to do the task. In
most of the cases, operators are allowed only to
operate the plant while maintenance engineers can
do the application modifications
 The security can be given for individual as well as for
groups

12.  Every control hardware has its own communication protocol
for communicating with different hardware/software. Some
of the leading communication protocol include Modbus,
Profibus, Ethernet, Dh+, DH485, Devicenet, Controlnet.
 The SCADA software needs device driver software for
communication with PLC or other control hardware.
 More the driver software available better is the device
connectivity. Most of the SCADA software used in the
industry have connectivity with most of the leading control
system.

13.  In many plants, it is important to download the real-
time information to the MIS. In this case the
database connectivity is must.
 Many SCADA software don’t have their own
database. Hence for storage and reporting they use
third party database like MS Access or SQL

14.  Script is a way of writing logic in SCADA software.
Every SCADA software has its own instructions and
way of writing program.
 Using scripts, one can develop complex
applications. You can create your own functions to
suit the process requirement and execution.
 Various types of scripts make project execution
simpler for programmer.

15.  In many applications, we have to use more than one
SCADA software/operator stations. This can be
achieved by taking the SCADA node on network.
 In many cases Ethernet TCP/IP is commonly used
for networking.
 In certain cases the SCADA software use proprietary
networking protocols for networking.

16. To start with the SCADA software were used for monitor and controlling the
parameters locally.

17. Subsequently the modems were used to monitor the data over a distance

18. The latest advancement in the SCADA technology includes the data monitoring on wide area
network using modems, Ethernet tcp/ip as well as GPS system

19.  Wonderware : InTouch
 Intellution : iFix (Earlier Fix DMACS)
 Allen Bradley : RS View (Earlier Control View)
 Siemens : WinCC (Earlier Coros LS /B )
 GE Fanuc : Cimplicity
 Indusoft : I W S
 Movicon : Progea

20. Chemical Plants

21. Reservoir Management