Allen-Bradley 1440-SDM02-01RA, User Manual, Page: 150 / 168

148 Rockwell Automation Publication 1440-UM001D-EN-P - September 2016
Appendix B CIP Objects
Instance Attributes
Table 76 - Spectrum Waveform Measurement Object Instance Attributes
Attribute
ID Access
Rule Name Data
Type
Description Semantics
3 Get Status BOOL Indicates if a fault or alarm has occurred. 0 = Operating without alarms or faults.
1 = Alarm or fault condition exists. The Spectrum and
Waveform data does not always match the actual field
value.
4 Get Data Units ENGUNIT The units context of the Data attributes. This setting is determined by the Output Data Units
attribute for the Channel Object.
See
page 140 .
5 Get Domain USINT The domain that is used for the spectrum and
waveform measurements.
0 = Frequency/Time
1 = Order/Position
6 Get/Set FMAX REAL The maximum frequency or order of the spectrum
data.
0…20,000 Hz if Domain = 0. There are several
predetermined FMAX settings for which spectrum
data can be produced. If you select an unsupported
value, then the next greater supported FMAX value is
used for the spectrum data.
4…40 Orders if Domain = 1.The Number of Lines
value must be evenly divisible by the FMAX value or
an Invalid Device Configuration error is returned
during the Device Mode Object Start and Save
services.
7 Get/Set Number of Spectrum
Lines UDINT Number of lines or bins in the spectrum data. 100, 200, 400, 800, or 1600
8 Get/Set Window Type USINT The window function to be applied to the waveform
data before computing the spectrum.
0 = Rectangular
1 = Hamming
2 = Hanning
3 = Flat Top
4 = Kaiser Bessel
9 Get/Set Period REAL The period of the waveform. Seconds if Domain = 0.
Cycles if Domain = 1.
10 Get Number of Waveform
Points UDINT Number of points in the waveform data. 256, 512, 1024, 2048, or 4096
11 Get Overlap USINT The percent overlap applied to the waveform data sets
used for calculating the spectrum.
Only 0% supported.
12 Get/Set Data Format USINT The format of the spectrum data. 0 = Complex data
1 = Magnitude data
13 Get Average Type USINT The type of averaging performed. 0 = Asynchronous (spectrum)
1 = Synchronous (waveform)
• Determined by the Synchronous attribute of the
Channel Object.
• When set to Asynchronous, consecutive spectrum
measurements are averaged together to produce
the Spectrum data.
• When set to synchronous, synchronized
waveforms are averaged together to produce the
Waveform data, and the Spectrum data is
produced from the averaged waveform. A trigger
source from a tachometer, for example, is required
to obtain the synchronized waveforms.