The control function of a SCADA system consists in the ability of the control system to interact with the controlled process, in order to modify its evolution according to pre-established rules or decisions taken by the operator. |
It is important to underline that, with “control of a SCADA system, we do not mean “real time process control”, usually the prerogative of the PLC, but rather the ability to modify the evolution of the process, for example by sending a different work recipe. |
To better clarify the concept, we can say that, with reference to a particular process temperature, the task of a real time control is to keep this temperature unchanged (by acting on the appropriate actuators), while the task of the SCADA control is to fix the temperature at which the process should work (by sending the appropriate set point). |
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