Rockwell Automation 1440-VLF02-01RA XM-121 Absolute Shaft Module - Manual (Page 72)

Publication GMSI10-UM014D-EN-P - May 2010
64 Configuration Parameters
Triggered Trend Parameters The Absolute Shaft module can collect a triggered trend. A triggered trend is a
time-based trend that is collected when a relay 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 Absolute Shaft
module can also store the 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 using generic configuration
tools such as RSNetWorx for DeviceNet.
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. More than one measurement 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 trigger 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 button).
Unlatched means that the trend data is overwritten
with new data every time a trigger occurs.
Check means latched
Clear means unlatched