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Rockwell Automation Publication 1440-UM001D-EN-P - September 2016 149
CIP Objects Appendix B
Services
Get Spectrum Chunk/Get Waveform Chunk
These services return a portion of the respective data structure. It is likely that
the spectrum and waveform data structures are too large to transfer over the
network in one message. These services let the data structures be transferred
over the network in smaller portions so that the explicit message buffer does
not need to be so large.
The Spectrum Data structure contains an array of values that, taken together,
are the output of the spectrum measurement that the Spectrum/Waveform
Measurement Object performs on the input signal. The size of the Spectrum
Data structure and format of the data array depends on the Data Format
14 Get/Set Number of Averages UINT The number of individual data sets to be incorporated
into the average calculation.
0 = Invalid
1 = No averaging
> 1 = Averaging
15 Get/Set Storage Option BYTE Determines what must be stored in response to a
storage trigger event. 1 = Store waveform
2 = Store spectrum
16 Get Storage time stamp LTIME Records the time stamp of the stored data. 64-bit microsecond counter-value.
Table 76 - Spectrum Waveform Measurement Object Instance Attributes (Continued)
Attribute
ID Access
Rule Name Data
Type
Description Semantics
Table 77 - Spectrum Waveform Measurement Object Services
Service
Code Class/Instance Usage Name Description
0E
h
Instance Get_Attribute_Single Returns one attribute.
10
h
Instance Set_Attribute_Single Sets one attribute.
(1)
(1) Attributes can only be set while the device is in Program mode. See the description of the Device Mode Object for more
information.
4B
h
Instance Get_Spectrum_Chunk Upload a portion of the current
Spectrum data.
4C
h
Instance Get_Waveform_Chunk Upload a portion of the current
Waveform data.