Allen-Bradley 1440-SDM02-01RA, User Manual, Page: 112 / 168

112 Rockwell Automation Publication 1440-UM001D-EN-P - September 2016
Chapter 4 Trends
Latch Enable Determines whether the triggered trend is latched or unlatched.
Latched means that subsequent triggers are ignored after the initial
trigger. This process 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 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
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
Post Trigger The percentage of records to be collected once the trigger occurs. For
example, if you set Post Trigger to 20%, then 80% of the records in the
trend are before the trigger occurs, and 20% after the trigger occurs.
This data lets you evaluate what happened after the trigger occurred.
0…100%
Status Shows the status of the trend data. Possible status values:
• Not collected - No trend data is collected.
• Collecting - A trigger has occurred and data
(including post-trigger data) is being collected.
• Collected - A trend has been saved to the buffer
and is available to view and upload.
Store Spectrum Stores the current spectrum data for both Channel 1 and Channel 2
when the trigger occurs.
Store Waveform Stores the current waveform data for both Channel 1 and Channel 2
when the trigger occurs.
View Trend Data Displays a plot of the collected trend data.
Reset Trigger Resets the trigger if Latch enabled is selected. The reset enables the
module to overwrite the previous trend data when the next trigger
occurs.
Manual Trigger Triggers the module to collect the trend data without relay activation.
View Collected Data Displays a plot of the collected spectrum or waveform data.
Table 30 - Triggered Trend Parameters (Continued)
Parameter Name Description Values/Comments