Schneider Electric 4000 manual Logging Memory Allocation, 104

Chapter 7—Logging

Memory Allocation

MEMORY ALLOCATION

Data Log 4

Available Space

Memory
Non-Volatile	Data Log 3
Monitor	Data Log 2
CircuitTotal
	Data Log 1
	Alarm Log
	100 ms Event Recordings
	Adaptive Waveform (seconds)

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

Figure 7–1: Memory allocation example

63230-300-212 April 2001

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.

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