Rockwell Automation 1440-SDM02-01RA XM-124 Standard Dynamic Measurement Module - Manuel (Page 86)

86 Rockwell Automation Publication 1440-UM001C-EN-P - May 2014
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 10 - 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 upon 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 prevents 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 on-board 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.
Refer
to Relay Parameters on page 82 .
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
Trend Span The total amount of time that can be covered by the trend data
(Number of Records x Record Interval).
Important: If you edit the Trend Span, the Record Interval is
automatically updated. Seconds