SCADA ( Supervisory Control And Data Acquisition System )

Understanding SCADA
    It works like a supervisor who supervises the entire plant area ,if needed it also controls the process as well 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 as well as logging the various values. Scada can do for you.
    Scada is not a 100% controller it is just a software which has to be linked with controllers. ultimately it has to connected to PLC / PID / DCS systems which in turn are connected to field instruments.
Supervisory Control & Data Acquisition Software:
Features of typical SCADA software
1) Dynamic representation                      2) Database connectivity 
3) Device connectivity                            4) Alarms
5) Trends                                               6) Scripts
7) Security                                             8) Recipe Management
9) Networking
I) DYNAMIC REPRESENTATION
1.This feature explains about the representation of various symbols of field instruments which are present in tool library which can be utilized in Scada applications.
2.Scada is not dedicated to any specific industry hence its library is so large that u can use it for any  industries available.
II) DATABASE CONNECTIVITY
1.Scada doesn’t has its own database just like microsoft has.Hence for storage it rely on databases available in the market.
2.It can be connected to VB , SQL ,EXCEL , or SAP.
III) DEVICE CONNECTIVITY
1.Scada is not a 100% controller.i.e.Scada alone can’t do any controlling .It has to be connected to controllers
2.Hence any scada can be connected to any PLC or DCS that are available in the market by using specific driver software.
IV) ALARMS
1.In the field area alarms are generated for warnings or to keep the process between certain limits.
2.Generally these alarms are implemented by indicating lamps or Hooters in field but Scada represents it with a format.
3.The format consists of date , time , status , priorities , many such elements which can be used for generation of reports.
V) TRENDS
1.These are also called as XY plotters or Data loggers. Basically it represents the values in wave formats .It is one of the important feature of Scada
2.It plots the value with reference to time.
3.Trend is subdivided into real time and historical trends.i.e.we can see the present values of the  process as well past values and can be stored and records can be maintained for the same.
VI) SCRIPTS
1.It is the combination of logical operators which are written in a statement.
2.It is used to run the applications made or stimulate before final execution.
3.Various types of scripts make project execution simpler for programmer.
Windows Scripts:
    On Show: Executes on time when the window is initially shown.
    While Showing: Executes continuously at the specified frequency while the window is showing.
    On Hide: Executes on time when the window is hidden.
VII)       SECURITY
1.Every application has to be secured from unauthorized users by different security levels .
2.In SCADA this security can be given as a whole as well as individually.

VIII)    RECIPE MANAGEMENT
1.One of the finest feature of any scada .
2.It explains that we can maintain various recipes of different process and implement it on the process.
3.All the recipes are stored in a single server and it can be fetched by any client server from any area to run the process.

IX)       NETWORKING
1.It explains we can share SCADA applications on LAN or Internet as well exchange of data is possible.
2.Lot many Networking protocols are supported by Scada software.
3.Can be put on networking with other peripherals and processors with various networking topologies.