EMS Manual

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Procedure Calls for Standard Events

EMS Manual—426909-005

11-32

Implementation

Constraints

The Configured_High_Level value must be greater than or equal to the

Configured_Low_Level value.

Initially, both the Configured_High_Level_switch and the

Configured_Low_Level_switch are set to true.

Behavior

An event is generated when the usage variable reaches or exceeds the

Configured_High_Level value and the Configured_High_Level_switch is true.

Concurrent with generating the event, the Configured_High_Level_switch is set to false

and the Configured_Low_Level_switch is set to true. The setting of the switches

guarantees that subsequent crossings of the Configured_High_Level level cause no

further event generation unless the usage value becomes equal to or less than the

Configured_Low_Level threshold value.

An event is also generated when the usage variable falls to, or below, the

Configured_Low_Level value and the Configured_Low_Level_switch is true.

Concurrent with generating the event, the Configured_Low_Level_switch is set to false

and Configured_High_Level_switch is set to true. The setting of the switches

guarantees that subsequent crossings of the Configured_Low_Level level cause no

further event generation unless the usage value becomes equal to or greater than the

Configured_High_Level threshold value.

Implementation

To implement the algorithm, three procedures are provided:

Configured_High_Level: Defines the value that the usage variable must reach

or exceed in order to generate the event.

Configured_High_Level_switch: A Boolean variable that controls whether the event is

to be generated when the usage reaches the

Configured_High_Level value.

Configured_Low_Level: Defines the value that the usage variable must fall to

or below in order to generate the event.

Configured_Low_Level_switch: A Boolean variable that controls whether the event is

to be generated when the usage falls to the

Configured_Low_Level value.

Procedure Page

EMS_UTCB_INIT_

11-33

EMS_USAGE_THRESHOLD_CHK_ 11-35

EMS_USAGE_THRESHOLD_EVT_BLD_ 11-36