Rockwell Automation 1440-VLF02-01RA XM-121 Absolute Shaft Module - Manual (Page 74)

Publication GMSI10-UM014D-EN-P - May 2010
66 Configuration Parameters
SU/CD Trend Parameters The Absolute Shaft module can collect startup or coast-down trend data when
the machine speed passes into a defined speed range. A tachometer input is
required to collect the startup/coast-down trend.
The XM module collects a startup 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 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).
The XM module can only store one startup/coast-down trend. Unless the
startup/coast-down trend is latched, the trend data is overwritten with new
data when the next startup or coast-down occurs.
The SU/CD trend parameters define the trend data that is collected by the
module during the startup or coast-down of a machine. Use these parameters
to configure the measurements included in the startup 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 using generic configuration tools
such as RSNetWorx for DeviceNet.
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.
Note: The Speed measurement is always included in
the startup/coast-down trend.
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.