Alarms: priorities, deadband and shelving
Цель: Изучить тему «Alarms: priorities, deadband and shelving» и закрепить её практическими заданиями и самопроверкой.
2 акад. часа чтение и разбор теории, решение задач, работа со схемой или виртуальным стендом и проверка понимания.
Основной материал
Alarm means operator action required. Not every status should be alarm. Too many alarms create alarm flood and hide critical events.
Priority
Priority based on consequence and response time. High priority requires fast action. Alarm rationalization defines cause, consequence, operator action and setpoint.
Deadband/delay
Used to prevent chatter but must be justified. Shelving temporarily hides known nuisance alarm with controlled time/reason; permanent disable is different and should be managed.
Практическая работа
For tank define LAHH, LAH, LAL, LALL and decide which are alarms vs trips. Write cause/consequence/operator response.
Самопроверка
• What makes an alarm?
• What is alarm flood?
• How priority determined?
• What is shelving?
• Why rationalization useful?
Что нужно запомнить
- Too many alarms create alarm flood and hide critical events.
- Alarm rationalization defines cause, consequence, operator action and setpoint.
- Shelving temporarily hides known nuisance alarm with controlled time/reason; permanent disable is different and should be managed.
- For tank define LAHH, LAH, LAL, LALL and decide which are alarms vs trips.