Rockwell Automation 1440-SDM02-01RA XM-124 Standard Dynamic Measurement Module - Manuel (Page 88)

88 Rockwell Automation Publication 1440-UM001C-EN-P - May 2014
Chapter 2 Configure the XM-124 Standard Dynamic Measurement Module
The SU/CD trend parameters define the trend data that is collected by the
module during the start-up or coast-down of a machine. Use these parameters to
configure the measurements included in the start-up and coast-down trend
records, the interval between trend records, and the minimum and maximum
speed limits at which record collection starts and stops.
IMPORTANT The SU/CD 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 11 - SU/CD Trend Parameters
Parameter Name Description Values/Comments
Enable SU/CD Trend Enables/disables the SU/CD trend measurements. Select to configure
the SU/CD trend measurements. Check to enable.
Clear to disable.
Select Measurements Sets the measurements to be collected and stored in the module.
Important: The Speed measurement is always included in the start-
up/coast-down trend. 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 start-up/coast-down trend is latched or
unlatched.
Latched means that subsequent start-up/coast-down trends are
ignored after the initial start-up/coast-down. This prevents the trend
data from being overwritten with new data until the trigger is
manually reset (click Reset Trigger).
Unlatched means that the start-up/coast-down trend data is
overwritten with new data every time the machine speed crosses into
the speed range. Check means latched
Clear means unlatched
Record Interval The change in speed between consecutive records.
Important: If you enter a Record Interval, the Maximum Trend
Span is automatically updated. 1…3600 rpm
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 XM 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 XM 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.