INSTALLATION AND OPERATING INSTRUCTIONS
SKF Multilog On-line System IMx-8/IMx-8Plus
SKF Multilog On-line System IMx-8/IMx-8Plus
User Manual
Revision E
33 (63)
The following are some examples of network load from an example configuration.
Trend data for 1 measurement point:
•
Vibration measurement point
160 bytes per trend value
•
Other measurement point, for example digital 50 bytes per trend value
FFT spectra for 1 measurement point:
•
Number of lines x 2 bytes (2 bytes if FFT spectra include only amplitude, but
4 bytes if FFT spectra include both amplitude and phase)
Time waveform storage:
•
Number of lines x 5.12 bytes per measurement point (2 bytes per sample)
For an 8-channel setup, the data rates can be illustrated as follows:
Setup:
•
8 vibration measurement points (3200 lines)
•
With time waveform
•
1 speed (tacho) measurement point
•
Store FFT spectra with time waveform 1 per day, trend data every 10 minutes
and digital data every 10 minutes.
Calculation for data per day would be:
FFT s time wa trend data + digital data
= (8 x 3200 x 2) + (8 x 3200 x 5.12) + (8 x 160 x 6 x 24) + (50 x 6 x 24)
= 51200 + 7200
= 375840 bytes per day or 375.8 KB per day
= 11.3 MB/month (average of 30 days per month)
In systems comprising large numbers of IMx devices, sharing network infrastructure,
it can be advantageous to offset their storage times such that, where possible, their
uploads are staggered.
2.5.16 Storage capacity
As noted in the specifications, each IMx-8/IMx-8Plus device has 4 GB effective flash,
non-volatile, storage used for the following:
•
1 GB for trend and dynamic data:
o
Depending on the measurement configurations and data storage
schedule configured, the data could be buffered for weeks up to
years.
o
When the buffer gets full the oldest data is discarded
–
first in first out.
o
Speed and temperature data use half the space of vibration data.
•
1 GB for event capture and run cycle data:
