Allen-Bradley 1440-SDM02-01RA, User Manual, Page: 114 / 168

114 Rockwell Automation Publication 1440-UM001D-EN-P - September 2016
Chapter 4 Trends
Maximum Trend Span The maximum change in speed 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.
rpm
Minimum Speed The lesser limit of the speed range in which records are collected in the
start-up/coast-down trend. This value must be less than the Maximum
Speed value.
rpm
Start-up/Coast-down Trend Considerations:
• The module collects a start-up trend when the
machine speed rises through the Minimum
Speed 8 rpm, and stops when the machine speed
crosses either the Minimum Speed or the
Maximum Speed. The module collects data only
when the machine speed is increasing. It does
not collect data if the machine speed is constant
or decreasing.
• The module collects a coast-down trend when
the machine speed falls through the Maximum
Speed - 8 rpm, and stops when the machine
speed crosses either the Minimum Speed or the
Maximum Speed. The module collects data when
the machine speed is decreasing or increasing
during a coast-down trend (for example, a coast-
down restart).
Maximum Speed The greater limit of the speed range in which records are collected in the
start-up/coast-down trend. This value must be greater than the
Minimum Speed value.
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 is
being collected.
• Collected - A trend has been saved to the buffer
and is available to view and upload.
View Trend Data Displays a plot of the collected trend data.
Reset Trigger Resets the trigger if Latch enabled is selected. This reset enables the
module to overwrite the previous trend data when the machine speed
crosses into the speed range.
Table 31 - SU/CD Trend Parameters (Continued)
Parameter Name Description Values/Comments