In factories and industrial installations, control systems are used to monitor and control processes. Control systems—whether conventional control panels or computer/PLC-based systems with SCADA or Distributed Control Systems (DCS)—provide a human-machine interface to monitor and control plant equipment and processes.
An alarm system consists of both hardware and software including: field signal sensors, transmitters, alarm generators and handlers, alarm processors, alarm displays, annunciator window panels, alarm recorders and printers. Alarm systems indicate the abnormal conditions and problems of the plant and equipment to the operators, enabling them to take corrective action and bring the plant/equipment back to normal conditions.
Protection provided by an alarm system can take place in two ways. The operator is warned by the alarm and he/she takes corrective action before the protection operates, or the operator is warned that the protection has failed to operate and he/she takes corrective action.
An ideal Alarm system also provides feedback on the corrective actions taken by the operator in response to the alarm. Such feedback is generally provided on supplementary display screens that can be accessed by selecting an alarm in the Alarm list.
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