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Introduction to <strong>Visual</strong> <strong>Components</strong> 2.3<br />

4.11.4.3.3 Bypass Image<br />

A triggered alarm can be ignored when it is bypassed, i.e. it is not indicated in the alarm array. The size of the<br />

bypass image must be identical to that of the alarm bit field (BOOL array). The image position in the bypass<br />

image is that of the triggered alarm.<br />

Specifying this variable is optional.<br />

4.11.4.3.4 Acknowledgement Image<br />

The acknowledgment image is written to the connected variable when an unacknowledged alarm is<br />

acknowledged or when a group acknowledgment takes place for the connected variable. The size of the<br />

acknowledgement image must be identical to the alarm bit field. In other words, both have to be of data type<br />

BOOL, and the array length must be the same. The position of the image in the acknowledgment image is that<br />

of the occurring alarm.<br />

Specifying this variable is optional.<br />

4.11.4.3.5 Alarm Scan Rate<br />

The alarm scan rate defines how often the alarm image is cyclically read by the alarm system for each group.<br />

The respective bit in the alarm bit field has to maintain its status for at least this amount of time so that the alarm<br />

is recognized as safe.<br />

4.11.4.3.6 Priority<br />

This entry sets the priority of all alarms in an alarm group. Priority can optionally be displayed in alarm arrays, or<br />

it can be evaluated in the alarm history log using filter functions. The display of alarms according to priority is<br />

only evaluated in the Last Alarm alarm line. The last unacknowledged alarm with the highest priority is output in<br />

this field.<br />

Priority Scale:<br />

Lowest priority<br />

0<br />

Highest priority<br />

9<br />

4.11.5 Creating and Configuring Alarms<br />

In <strong>Visual</strong> <strong>Components</strong>, alarms are managed in alarm groups. Alarms can only be created if alarm groups are<br />

present and have already been configured. See Using Alarm Groups.<br />

4.11.5.1 Setting Up and Editing Alarms<br />

A new alarm can be inserted into the list by selecting the menu option "Insert Alarm" in the shortcut menu of the<br />

appropriate alarm group. An alarm can also be created with the [INS] key. A maximum of 128 alarms can be<br />

defined per alarm group.<br />

4.11.4.3 Alarm Group Parameters 403

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