
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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Страница 12: ...12 Rockwell Automation Publication 1444 UM001D EN P June 2018 Preface Notes...
Страница 198: ...198 Rockwell Automation Publication 1444 UM001D EN P June 2018 Chapter 5 Configure the Tachometer Expansion Module Notes...
Страница 210: ...210 Rockwell Automation Publication 1444 UM001D EN P June 2018 Chapter 7 Configure Relays Notes...
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Страница 240: ...240 Rockwell Automation Publication 1444 UM001D EN P June 2018 Chapter 9 Trend and Transient Capture Notes...
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