Horner APG XL4 OCS - Manual (Page 78)

CH.13 MAN0964-01-EN
June 29, 2012 Page 78 of 122
The alarm object is generally used to enunciate alarms to the operator. While the display characteristics
of this object is configurable, it is generally displayed as a button that changes colors to indicate the
highest state of the alarm(s) in the alarm group it is monitoring. The following indicates the priority of the
alarm states and the default colors associated with these states.
• Highest (Red) - Unacknowledged Alarms Exist
• - (Yellow) - Acknowledged Alarms Exist
• Lowest (Green) - No Alarms Exist
Figure 13.3 – Alarm Object
To view, acknowledge and/or clear alarms, the operator must access the alarm viewer. This is
accomplished by touching an (enabled) alarm object. When accessed, the alarm viewer is displayed as
pop-up alarm viewer dialog similar to that shown in Figure 13.6.
Figure 13.4 – Alarm Viewer
The currently selected entry is indicated by a yellow highlight which can be moved up or down by
touching the arrow buttons or by directly touching an entry. If more entries exist than can fit on the page,
a scroll bar is displayed on the right side that also indicates the current relative position.
The current state of the displayed alarm is indicated by its color and optionally by an abbreviated indicator
after the date/time stamp (ALM, ACK, RTN). The operator can acknowledge an alarm by selecting it
from the list and touching the ACK button. The operator can also clear an alarm if that function is enabled
in the alarm object. If not enabled, the Clear buttons are grayed and do not respond to touch. Once view
operations are complete, simply touch the Esc button to remove the pop-up alarm viewer.
Note that OCS registers %SR181 and %SR182 are available for ladder use, which indicate presence of
unacknowledged or acknowledged alarm (respectively). The screen designer may implement these
registers to switch screens or activate the beeper to attract the operator’s attention.