DCS Alarm and Events
Alarms are the notifications used to inform operators of process activity: Alarms represent warnings of process conditions that could cause problems, and require an operator response.
A typical alarm is triggered when a process value exceeds a user-defined limit. DCS uses for types of alarms LOLO, LO, HI and HIHI.
Events represent normal system status messages, and do not require an operator response. A typical event is triggered when a certain system condition takes place, such as an operator logging.