Rockwell Automation 1440-SDM02-01RA XM-124 Standard Dynamic Measurement Module - Manuel (Page 145)

Rockwell Automation Publication 1440-UM001C-EN-P - May 2014 145
CIP Objects Appendix B
Spectrum Waveform
Measurement Object
(Class ID 324
H
)
The Spectrum/Waveform Measurement Object models a spectrum and
waveform measurement.
When requesting the first byte of waveform or spectra data the module copies the
most recently sampled live measurement to a hold buffer where it is held until the
entire measurement is uploaded to the host, or until a new first byte request is
made. If the measurement mode is Synchronous, and the channels have the same
number of orders and number of lines, then when the first byte of the channel 0
data is requested, the module copies the simultaneous measurements for both
channel 0 and channel 1 to the hold buffer.
Class Attributes
The Spectrum/Waveform Measurement Object provides no class attributes.
Instances
There are four instances of this object. Instances 1 and 2 are the standard
spectrum (and waveform) for channels 1 and 2, respectively. Instances 3 and 4 are
the gSE spectrum for channels 1 and 2, respectively. Instance 3 and 4 support the
gSE spectrum only and not a waveform. Also, instances 3 and 4 do not support
the Complex Data Format.
Instance Attributes
Table 68 - Spectrum Waveform Measurement Object Instance Attributes
Attr 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 may not
represent the actual field value.
4 Get Data Units ENGUNIT The units context of the Data
attributes. This setting is determined by the Channel
Object’s Output Data Units attribute (see
page 138 ).
5 Get Domain USINT The domain 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.