Define Alarm - Omron NTXS Manual

Alarm
9.1

Define Alarm

Alarm will be displayed in the alarm window only if it is defined from the 'Define Alarm' menu.
There are two categories of alarm
1. Real time alarms: Stored & displayed as long as unit power is ON.
2. Historical alarms: Stores alarms in memory with battery back up.
Note: Historical alarms are only supported for the units with RTC / Battery backup.
In case of historical alarms the alarms defined with "Historical attribute" are logged till the unit is ON.
Then even though you turn the unit OFF & then back ON after few days you can still view the alarms that
were present when the unit was ON earlier.
The alarm object displays the alarm text when the alarm occurs. First triggered alarm is on top. Alarm
condition for alarm should be cleared. Each alarm has to be acknowledged. 'Acknowledge Alarm' key
acknowledges the alarm. The alarm text is cleared when the alarm condition is cleared and the alarm is
acknowledged. Alarm text for unacknowledged or uncleared alarm will not be cleared. Any tag can be
continuously monitored by defining alarms for each bit of that tag. To display an alarm on the screen as
soon as it is triggered, alarm object has to be placed on the screen. An alarm is triggered for each bit in
a tag. If the value of the particular tag becomes nonzero, corresponding alarm is displayed in the alarm
object.
An alarm is a bit in a particular 2-byte tag. This two-byte tag is defined as a particular group in the alarm
definition table. Since a two-byte tag contains 16 bits one such tag can generate 16 alarms. So to define
64 alarms we need to create 4 groups with 4 different two byte tags & define one alarm per bit in that. In
total you can define up to 256 real time & 30 historical alarms.
150