NOTE
The raw data in the frequency and time range are designed for installation and more
accurate evaluation only. It is not intended for permanent readout due to the high time
required for readout and the large resulting amount of data.
The readout of the vibration spectrum and the time range raw data is done in a
Snapshot
mode. In this
Snapshot
mode, the current spectrum and raw time range data are held in
the memory until they are completely read out.
NOTE
As long as
Snapshot
mode is activated, no new data blocks are recorded and accordingly
no time or frequency range parameters are updated.
Typically, reading out the entire spectrum and raw time range data can take up to 20
seconds due to the larger amount of data.
If both the raw time range data and the entire spectrum of a block are required, the raw
time range data must be read out first before the spectrum is read out.
After a change to the spectrum readout mode, the raw time range data for the recorded
block is no longer available. To read out the raw data,
Snapshot
mode is activated by
writing the corresponding value in Index 4585. A 1 provides the raw time range data, a
2 the vibration frequency spectrum. If the sensor is in a manual trigger mode, a trigger
signal must then be sent to record a block. In automatic trigger mode, the raw data of
the next available block is provided.
Table 13: Reading out Index 4586 raw data
Subindex
Name
1
0 = no raw data available
1 = raw time range data available
2 = vibration frequency spectrum available
2
Number of values in the
Snapshot
, corresponds to the number of
samples of
the raw time range data of an axis or the number of amplitude values of the
vibration frequency spectrum
3
Number of segments in which the data can be read out
4
Time interval between the individual
in the raw time range data
5
Frequency spacing between the amplitude values in the vibration frequency
spectrum
Since raw data is a large amount of data, it cannot be provided all at once via an
index. Instead, they are divided into individual segments and can be read sequentially.
By stringing together the individually read segments, the complete data set is obtained.
The number of segments to be read out is obtained from Subindex 3. The number of
valid data points from Subindex 2.
9.3.3.1
Read out of raw time range data (Index 4585-4588)
The readout of the raw time range data can be especially interesting for applications
where you expect changes of the vibration within a block or where you want to set a
manual trigger.
Reading the entire block can be done using the following steps:
1.
Activate
Snapshot
mode via Index 4585=1. Use this to request raw time range data.
2.
Wait until the availability of the data is indicated by a 1 in Index 4586, Subindex 1.
Now the readout can be started .
3.
Set the axis to be read out via Index 4587, Subindex 2.
4.
Select the first segment by writing a 0 in Index 4587, Subindex 1.
OPERATION
9
8028041/2022-08-16 | SICK
O P E R A T I N G I N S T R U C T I O N S | MPB10
41
Subject to change without notice
