We know that PLC  and DCS  in the industry levels controls all the plants functionary, ie, from the manufacturing to the maintenance. But how  does SCADA comes into the Controls Of INDUSTRY
          
    IDEA ABOUT SCADA   

• SCADA stands for "supervisory control and data acquisition"

The operator working at basic control lvl in process industry  looks for process parameters like temp,pressure and flow in real time through HMIs(Human machine Interace ) and  maybe RTUs(Remote Terminal Units). He can manipulate certain parameters  as per process requirements. On the other end, the process engineer looks into his controller screen (for the same process ) that maybe at Control server and he  control some parameters  which the operator @ field  cannot control. The controlling by the  process engineer is SUPERVISORY.
          Now, the Lead Instrumentation Engineer has a different control over the process. He can change over process and also add or remove some process  components. 
            At the managerial level, the manager  of the plant may change the process on certain feedbacks he gets from the market, for example, he may change some parameters that is in his controls like quantity,outlook of the product that is being manufactured .
     So from what we saw, SCADA gives everyone  some control over the plant and which is unique as the controller itself. This kind of contrrol is not built in with PLC or DCSs; but comes  with some controllers like  PAC ((pragrammable automation controllers ). With using SCADA, this type of control can be enabled on PLCs and DCSs.


Some photos to show scada ,









This screenshot shows how scada come into cement batching process.
















This screenshot show SCADA for Well controls