09-09-2017, 09:37 AM
SCADA is a control system architecture that uses computers, network data communications and graphical user interfaces for high-level management of process monitoring, but uses other peripheral devices such as programmable logic controllers and discrete PID controllers. plant or process machinery. Operator interfaces that allow the monitoring and issuance of process orders, such as controller set point changes, are handled through the SCADA monitoring computer system. However, real-time control logic or controller calculations are performed by modules connected in network to field sensors and actuators.
The SCADA concept was developed as a universal means of remote access to a variety of local control modules, which could be from different manufacturers allowing access through standard automation protocols. In practice, large SCADA systems have grown to become very similar to distributed control systems in function, but using multiple means of interfacing with the plant. They can control large-scale processes that can include multiple sites and work over large distances. It is one of the most commonly used types of industrial control systems, however, there are concerns about SCADA systems that are vulnerable to cyberwar / cyberterrorism attacks.
This is the core of the SCADA system, collecting data on the process and sending control commands to devices connected to the field. It refers to the computer and software responsible for communicating with field connection controllers, which are RTUs and PLCs, and includes HMI software running on the operator's workstations. In smaller SCADA systems, the monitoring computer may consist of a single PC, in which case the HMI is part of this computer. In larger SCADA systems, the master station may include several HMIs hosted on client computers, multiple data acquisition servers, distributed software applications, and disaster recovery sites. To increase the integrity of the system, multiple servers will often be configured in a dual redundancy or hot standby array that provides continuous monitoring and control in the event of server malfunction or failure.
The SCADA concept was developed as a universal means of remote access to a variety of local control modules, which could be from different manufacturers allowing access through standard automation protocols. In practice, large SCADA systems have grown to become very similar to distributed control systems in function, but using multiple means of interfacing with the plant. They can control large-scale processes that can include multiple sites and work over large distances. It is one of the most commonly used types of industrial control systems, however, there are concerns about SCADA systems that are vulnerable to cyberwar / cyberterrorism attacks.
This is the core of the SCADA system, collecting data on the process and sending control commands to devices connected to the field. It refers to the computer and software responsible for communicating with field connection controllers, which are RTUs and PLCs, and includes HMI software running on the operator's workstations. In smaller SCADA systems, the monitoring computer may consist of a single PC, in which case the HMI is part of this computer. In larger SCADA systems, the master station may include several HMIs hosted on client computers, multiple data acquisition servers, distributed software applications, and disaster recovery sites. To increase the integrity of the system, multiple servers will often be configured in a dual redundancy or hot standby array that provides continuous monitoring and control in the event of server malfunction or failure.