S – Supervisory – The Name itself says that to supervise, means the functions which are happening at the real time on ground are visible on the screen.
C – Control – Control means to control the field devices which are connect the automated system, these are done with the help of the field devices and the field instruments.
A – AND
D – Data – Means the data which are available or we are getting from the field devices, these data are the temperatures, pressure, signals etc.
A – Acquisition – this means the data is also writable