User Manual

Alarm management

Alarm functions

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9.5 Alarm functions

Depending on the type and degree of urgency of the alarm, the system user

may be required to acknowledge a change in the alarm state with an explicit

operator action.

There are two types of acknowledgement:

● Acknowledgement: Confirmation of an incoming alarm

● Reset: Confirmation that an alarm is no longer present

This type of interaction can be carried out locally or with clients, via the

network.

Standard pattern

There are three standard categories of alarm, or alarm functions, reflecting the

type of acknowledgement required:

● Simple alarm

● Basic alarm

● Extended alarm

Each alarm source is assigned (via a Notification Class, see further below) to

one alarm function only. No further distinction is made at this stage between

OFFNORMAL and FAULT alarms.

Neither incoming alarms (disturbance appears) nor disappearing alarms

(disturbance disappears) require acknowledgement.

Acknowledgment is required for incoming alarms only, but not for alarms that

have been cleared (that is, acknowledgement required but not reset).

Locking alarm with acknowledgement of incoming alarms (disturbance

appears) and cleared alarms (disturbance disappears). Alarms in this category

require both acknowledgement and reset.

While testing the system, it may not be possible to reset an alarm. The reason

is that an Extended Alarm is not reset until it has been acknowledged, and the

time delay has expired.

Acknowledgement

Simple alarm

Basic alarm

Extended alarm