Allen-Bradley 1440-SDM02-01RA, User Manual, Page: 90 / 168

90 Rockwell Automation Publication 1440-UM001D-EN-P - September 2016
Chapter 2 Configure the XM-124 Standard Dynamic Measurement Module
Triggered Trend Parameters
The XM-124 module can collect a triggered trend. A triggered trend is a time-
based trend that is collected when a relay on the XM module is activated, or the
module receives a trigger event.
Once the triggered trend is configured, the XM module continuously
monitors the trended measurements. When a trigger occurs, the XM module
collects additional data as specified by the Post Trigger parameter. The XM-
124 module can also store the spectrum or waveform at the time of the trigger.
The XM module can only store one triggered trend. Unless the triggered trend
is latched, the trend data is overwritten with new data when the next trigger
occurs.
The triggered trend parameters define the trend data that is collected by the
module. Use these parameters to select the measurements included in the trend
records, the interval between trend records, and which relay triggers (activates)
the collection of the trend data.
IMPORTANT The Triggered Trend parameters are not included in the EDS file and
cannot be edited by using generic configuration tools such as
RSNetWorx™ for DeviceNet software.
Table 18 - Triggered Trend Parameters
Parameter Name Description Values/Comments
Enable Triggered Trend Measurements Enables/disables the triggered trend measurements. Select to configure
the triggered trend measurements. Check to enable.
Clear to disable.
Select Measurements Sets the measurements to be collected and stored in the module. 1…16 measurements can be selected.
Number of Records The maximum number of measurement sets that can be collected in the
trend buffer. The measurement sets make up the trend data.
The Number of Records is automatically calculated
based on the number of Trended Measurements
selected.
Latch Enable Determines whether the triggered trend is latched or unlatched.
Latched means that subsequent triggers are ignored after the initial
trigger. This latch helps prevent the trend data from being overwritten
with new data until the trigger is manually reset (click Reset Trigger).
Unlatched means that the trend data is overwritten with new data
every time a trigger occurs. Check means latched
Clear means unlatched
Relay Number Sets the relay that triggers the trend to be collected. None means that the trend can only be triggered
manually or by a trigger event (for example, XM-
440).
Relay Number 1 is the onboard relay. Numbers 2…5
are either relays on the Expansion Relay module
when it’s connected to the module or virtual relays.
IMPORTANT: The relay must be enabled.
See
Relay Parameters on page 86 .
Record Interval The amount of time between consecutive trend records.
IMPORTANT: If you enter a Record Interval, the Trend Span is
automatically updated.
1…3600 seconds