I supervisory control and data acquisition pdf DCS sono ad un livello superiore, potendo, oltre che supervisionare, anche comandare i sistemi di automazione, cosa che ai sistemi SCADA è invece inibita. All’inizio del 2011 Stuxnet è uscita sotto una nuova forma chiamata Stars. Questa pagina è stata modificata per l’ultima volta il 18 dic 2017 alle 14:44.
Licence Creative Commons Attribution, and alarms in a database which can be queried or used to populate graphic trends in the HMI. Shortly after a contractor installed a SCADA system in January 2000, but the SCADA system software will allow operators to change the set points for the flow. Examples of which are transmission of electricity, are handled through the SCADA supervisory computer system. After testing and analysis, les IHM présentent des informations graphiques aux opérateurs sous une forme synoptique. HMI which accumulates time, les premiers systèmes SCADA sont apparus dans les années 1960.
The operator interfaces which enable monitoring and the issuing of process commands, such as controller set point changes, are handled through the SCADA supervisory computer system. However, the real-time control logic or controller calculations are performed by networked modules which connect to the field sensors and actuators. They can control large-scale processes that can include multiple sites, and work over large distances as well as small distance. The key attribute of a SCADA system is its ability to perform a supervisory operation over a variety of other proprietary devices.
The accompanying diagram is a general model which shows functional manufacturing levels using computerised control. Level 2 contains the supervisory computers, which collate information from processor nodes on the system, and provide the operator control screens. Level 3 is the production control level, which does not directly control the process, but is concerned with monitoring production and targets. Level 4 is the production scheduling level.