Supervisory Control And Data Acquisition (SCADA): Automatic Change-of-State (COS) Control Response To Increase Network Security

SCADA Control is a core component of a SCADA Monitoring System

Advanced SCADA (Supervisory Control and Data Acquisition) systems support control functions. SCADA control functions are what enable a system to automatically respond to certain situations with a programmed response. Sensors cannot generate or interpret protocol communications. Remote Telemetry Units (RTUs) along the network interpret the information from these sensors, and translate it into a language the master can understand.

Control Relays That Automatically Respond to Change-of-State Events

The master can utilize the information it receives from various inputs to enact control relays at the RTU level. This means that whenever a user-specified combination of alarms occur, the RTU will automatically respond with a SCADA control relay that has been programmed into the system, securing the network by responding to the Change-of-State (COS) event indicated by the alarm.

"Derived Controls" provide for instant reactions of the monitoring system in the event that user-specified alarm combinations occur. For example, if two individual alarms occurred at a single site, indicating that there was a power failure and a battery failure, a Derived Control would be activated, powering on a back-up generator. These SCADA controls prevent the interruption of mission-critical operations, even when a network operator is unavailable to manually respond to an alarm notification.

Lesser monitoring systems do not provide SCADA control functions. They simply allow for monitoring of a network. Operators using these types of systems must manually respond to individual alarms. This can be time consuming and very inefficient when dealing with complex processes at multiple sites.

NetGuardian 832A Supports up to 8 Controls for Added Network Security

This is why it is critical for operators to look for RTUs that can support both discrete and analog alarms, as well as control relays, when deploying a SCADA system. RTU devices, such as the NetGuardian 832A, are capable of all of these functions, eliminating inefficiencies by responding to alarms with control relays. The NetGuardian can support up to 32 discrete alarms, as well as 8 analog alarms and 8 controls. With a large capacity such as this, operators can create controls to respond to numerous alarm combinations along their network, while easily accommodating additional devices as their network expands.

Resources Related to SCADA Tutorials:
SCADA Tutorial White Paper
To see additional information related to a "SCADA Manual", please visit the SCADA Monitoring page.