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Chapter 7—Logging 63230-300-212
Memory Allocation April 2001
© 2001 Schneider Electric All Rights Reserved
104
The circuit monitor’s standard, nonvolatile memory is 8MB and can be
upgraded to 16MB, 32MB, and higher. See “Upgrading Memory in the Circuit
Monitor” on page 123 for more information about upgrading memory.
When using
SMS to set up a circuit monitor, you must allocate the total data
storage capacity between the following logs and recorded information:
• Alarm log
• Steady-state waveform capture
• Disturbance waveform capture (cycles)
• Adaptive waveform capture (seconds)
• 100-ms rms event recording
• Up to 14 data logs
• Min/Max/Average log
In addition, the choices you make for the items listed below directly affect the
amount of memory used:
• The number of data log files (1 to 14)
• The registers logged in each entry (1 to 96), for each data log file.
• The maximum number of entries in each data log file.
• The maximum number of events in the alarm log file.
• The maximum number of waveform captures in each of the waveform
capture files. Consider that you set the maximum number for three
different waveform captures: steady-state, disturbance waveform (cycles),
and adaptive waveforms (seconds) plus a 100 ms rms event recording.
The number you enter for each of the above items depends on the amount of
the memory that is still available, and the available memory depends on the
numbers you’ve already assigned to the other items.
With a minimum of 8 MB of memory, it is unlikely that you will use all the
circuit monitor’s memory, even if you use all 14 data logs and the other
recording features. However, it is important to understand that memory is
shared by the alarm logs, data logs, and waveform captures. Figure 7–1on
the left shows how the memory might be allocated.
In Figure 7–1, the user has set up an adaptive waveform (seconds), a 100
ms event recording, an alarm log, and three data logs (two small logs, and
one larger log). Of the total available nonvolatile memory, about 25% is still
available. If the user decided to add a fourth data log file, the file could be no
larger than the space still available—25% of the circuit monitor’s total storage
capacity. If the fourth file had to be larger than the space still available, the
user would have to reduce the size of one of the other files to free up the
needed space.
MEMORY ALLOCATION
Adaptive Waveform (seconds)
Data Log 4
Data Log 3
Data Log 2
Data Log 1
Alarm Log
100 ms Event Recordings
If you want to add a new log file,
but the file is too large for the
available space, you must either:
• reduce the size of Data Log 4 or
• reduce the size of one or more
of the existing files
Total Circuit Monitor Non-Volatile Memory
Available Space
Figure 7–1: Memory allocation example