Alarms and Events Logging Project Mentors: Suneel Kumar Venugopal Vanga

‘Alarms’ Requirements Alarms are raised at any ‘point’ in the SCADA system, when the value exceeds a particular range. Alarms are raised at any ‘point’ in the SCADA system, when the value exceeds a particular range. The range can be dynamically varied depending on weather. The range can be dynamically varied depending on weather. There should be stages of severity of alarms. There should be stages of severity of alarms.

Alarms Contd. Alarms are displayed online and need not be stored in the database. Alarms are displayed online and need not be stored in the database. An alarm should not be erased before the user takes appropriate action An alarm should not be erased before the user takes appropriate action Alarms should be sorted according to order of priority before displaying it. Alarms should be sorted according to order of priority before displaying it. Alarms can be edited Alarms can be edited

‘Events’ Requirements Events are also like alarms but can be generated even when the value is within the ‘safe’ range. Events are also like alarms but can be generated even when the value is within the ‘safe’ range. Events need to be logged into the database Events need to be logged into the database Events are in fixed format. Events are in fixed format. Events cannot be edited Events cannot be edited

Events Contd. Events are written with the date and time into the database and does not need user intervention. Events are written with the date and time into the database and does not need user intervention. Search for events that occurred years back. Search for events that occurred years back.

Alarm/Event Monitor Module Control System Database GUI RTURTU System Alarm/Event generator System Design diagram

Prerequisites and Outstanding Issues All information like limits associated with SCADA points are stored in the database previously. All information like limits associated with SCADA points are stored in the database previously. Only events are logged. Alarms are not entered into the database. Only events are logged. Alarms are not entered into the database. Alarms are lost once the system is shut down. No recovery is possible. Alarms are lost once the system is shut down. No recovery is possible.

Steps In processing 1. The Event/Alarm monitor program continuously checks for events/alarms. 2. As soon as one is raised, it informs the control system about the point in the SCADA system in which it is raised, the value at the point. 3. The control system analyses the event/alarm and compares with the limits that are in the database.

Steps Contd. For the alarms two types of lists are maintained Acknowledged/ Unacknowledged. For the alarms two types of lists are maintained Acknowledged/ Unacknowledged. As noted in the requirements the severity of the alarms, the priority for the SCADA point, present weather are all used to appropriately position the alarm in the unacknowledged list. As noted in the requirements the severity of the alarms, the priority for the SCADA point, present weather are all used to appropriately position the alarm in the unacknowledged list.

Steps Contd. Events are first logged into the database before informing the user Events are first logged into the database before informing the user They are persistent. They are persistent. There is no need for user acknowledgement of events. There is no need for user acknowledgement of events.

Plan of the design Generating program though external to the system is a part of the project. Generating program though external to the system is a part of the project. The monitor system, generating program, the control system form the major part and would be independently developed. The monitor system, generating program, the control system form the major part and would be independently developed. The database and the GUI will be developed simultaneously with the other parts. The database and the GUI will be developed simultaneously with the other parts.

Questions?

Nitin Gupta Arvind Tiwary L. Jagannathan Ashutosh Parida Thank You