Chapter 7—Logging 63230-300-212
Memory Allocation April 2001
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The circuitmonitor’s standard, nonvolatile memory is 8MB and can be
upgradedto 16MB, 32MB, and higher.See “Upgrading Memory in the Circuit
Monitor”on page 123 for more informationabout upgrading memory.
When using SMS to set up a circuit monitor,you must allocate the total data
storage capacitybetween the following logs and recorded information:
•Alarm log
•Steady-statewaveform capture
•Disturbancewaveform capture (cycles)
•Adaptivewaveform capture (seconds)
•100-ms rms eventrecording
•Up to 14 data logs
•Min/Max/Averagelog
Inaddition, the choices you make for the items listed belowdirectly affect the
amount of memory used:
•The number ofdata log files(1 to 14)
•The registerslogged in each entry (1 to 96), for each data log file.
•The maximum numberof entries in each data log file.
•The maximum numberof events in the alarm log file.
•The maximum numberof waveform captures in each of the waveform
capture files.Consider that you set the maximum number for three
differentwaveformcaptures: steady-state, disturbancewaveform (cycles),
and adaptivewaveforms (seconds) plus a 100 ms rms event recording.
Thenumber you enter for each of the aboveitems depends on the amount of
the memory that isstill available, and the availablememory depends on the
numbersyou’ve already assigned to the other items.
With a minimumof 8 MB of memory, it is unlikely that youwill use all the
circuit monitor’smemory, even ifyou use all 14 data logs and the other
recordingfeatures. However,it is important to understand that memory is
shared by thealar mlogs, data logs, and waveform captures. Figure 7–1on
the lefts howshow the memory might be allocated.
In Figure 7–1, the userhas set up an adaptivewaveform (seconds), a 100
ms eventrecording, 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 fourthdata log file, the file could be no
largerthan the space still available—25%of the circuit monitor’stotal storage
capacity.If the fourth file had to be larger than the space still available,the
user would haveto 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