2 Visual Components Manuals

As a result, the appropriate group alarm is active and is used together with the individual alarms for all areas of
the alarm system.
If a group alarm is acknowledged, then the triggering alarm is also acknowledged as long as it is valid. This also
applies to bypassing alarms.
4.11.10 Bypass and Acknowledgement Images
In addition to the alarm bit field, two more connections of individual alarms can be made between the Visual
Components alarm system and the control application. The user then has the option to acknowledge or bypass
the alarms.
4.11.10.1 Usage
The alarm bit fields for bypass and acknowledgement use the same indexing (item numbering). In other words,
the alarm in item [2] of the alarm bit field is connected with the acknowledgement information in item [2] of the
acknowledgement bit field and the bypass information in item [2] of the bypass bit field.
4.11.10.1.1 Bypass Bit Field
In the bypass bit field, the alarm system records whether the appropriate alarm was bypassed. In this way, a
block caused by the alarm can be bypassed using the controller.
A data element in the bypass bit field is 0 if the alarm is bypassed, and 1 if the alarm is not bypassed.
Evaluation of the bypass must take place in the control application. The alarm system only provides the
necessary control elements and the bypass bit field for the application.
4.11.10.1.2 Acknowledgement Bit Field
This bit field contains information concerning whether the appropriate alarm has been acknowledged. This
information can be evaluated in the control application.
A data element in the acknowledgement bit field is 1 if the alarm is acknowledged, and 0 if unacknowledged.
Alarm latch implementation, which requires acknowledgement, is provided in the Visual Components alarm
system display.
Advanced alarm acknowledgement processes are very application specific and must be programmed in the
control application.
4.11.10.2 Setting Parameters
Introduction to Visual Components 2.3
Variables for the bypass and acknowledgement bit fields, if used, must have the same data type and length as
the alarm bit field. This also applies if only alarms with a lower index are considered for bypass or
acknowledgement in the application.
422 4.11.10 Bypass and Acknowledgement Images