Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 475
CIP Objects Appendix A
Dynamix FFT Band Object
The FFT Band Object (class code 0x399) defines the setup and holds the
results for spectral bands that are calculated from Onboard FFT
measurements. The FFT bands object provides a total 32 instances (an average
of 8 per channel for a 4-channel protection module). The ability to select the
source data for the FFT Band objects allows for future support for linking to
Normal/Advanced CM data objects. Current support is for the Module
Control object only (DSP-based FFT)
Table 212 - Object Instances
Instance ID Description
0 FFT Band Class Instance
1…32 Instances 1…32 provide for flexible assignment of the FFT bands to any
measurement channel (0…3 for a 4 channel protection module).
Table 213 - Class Attributes
Attribute ID Access Rule NV Name Data Type Description of Attribute Semantics of Values
1 Get NV Revision UINT Current object revision. Current revision.
8 Get V Enabled Instances DWORD Bit-wise coding of enabled FFT
Band instances (32 bits used).
Decoding information
9 Get V Channels with FFTBands WORD Bit-wise coding of channels with
FFT Bands (4 bits used).
0: No FFT bands that are allocated
or
1: One or
more FFT bands that are allocated to this
channel
10 Get V Channel 0 - FFT Bands DWORD Active instances for
measurement channel 0
0: This FFT band not allocated
1: This FFT band is allocated to this
channel
11 Get V Channel 1 - FFT Bands DWORD Active instances for
measurement channel 1
12 Get V Channel 2 - FFT Bands DWORD Active instances for
measurement channel 2
13 Get V Channel 3 - FFT Bands DWORD Active instances for
measurement channel 3
Table 214 - Instance Attributes
Attribute ID Access
Rule
NV Name Data Type Description of Attribute Semantics of Values
1 Get V Band RMS REAL Overall Band RMS measurement
value.
2 Get V Band max REAL Maximum line/bin value in band. RMS
3 Get V Band max Frequency REAL Frequency at which Band max occurs. Hz / Order
6 Get V Band Value REAL One value from a choice of Band RMS,
max, and Frequency, made by
configuration.
FFT Band Source Group of two configuration attributes.
16 Get V Channel Source SINT The channel FFT to which this band is
applied.
Channel range 0…3
-128: OFF
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