Halytech
hydroSpider2 User’s Manual v1.23
Page 57
Format
: The format in which alarm reports are sent. See Appendix I - Report Formats
Time order
: Select increasing to have the records in the alarm report ordered from oldest to
newest; or decreasing to have the records ordered from newest to oldest.
5.10.4
Trigger Sources
As mentioned earlier, alarms have a variety of different sources available which can be used to
trigger alarms. The available trigger sources are covered in the following sections.
5.10.4.1
Channels
Any configured channel can be used as an alarm trigger source.
Switch channel as a trigger source
Analogue channel as a trigger source
Selecting a channel as a trigger source presents the following additional options:
Trigger when
: This applies to switch inputs only, and specifies whether the alarm should
activate when the switch is off (open) or on (closed)
Trigger level
: This determines at what channel value the alarm should go active. There are a
number of different types of trigger level which become available depending on the channel
selected as the trigger source:
o
Above
: Active when the channel value is above the specified value
o
Below
: Active when the channel value is below the specified value
o
Change of
: Active when the channel value has changed by at least the specified
value in the specified amount of time.
Rising or falling
: The alarm will trigger if the channel value is either rising or
falling
Rising
: The alarm will only trigger on a rising value
Falling
: The alarm will only trigger on a falling value
o
Event
: Active when any event (change in value) occurs on an event channel.
Note that the event trigger type is only applicable to event inputs, and cannot be
selected if periodic reset has been enabled for this channel.
