© 2008 Siemens Energy & Automation, Inc. All Rights Reserved.
ACCESS 9340 and 9360 Meters PMCM-9340D-0208
Chapter 8—Logging 2/2008
EN–100
Billing Log
The meter stores a configurable billing log that updates every 10 to
1,440 minutes (the default interval 60 minutes). Data is stored by
month, day, and the specified interval in minutes. The log contains 24
months of monthly data and 32 days of daily data, but because the
maximum amount of memory for the billing log is 64 KB, the number
of recorded intervals varies based on the number of registers
recorded in the billing log. For example, using all of the registers
listed in Table 8–6, the billing log holds 12 days of data at 60-minute
intervals. This value is calculated by doing the following:
1. Calculate the total number of registers used (see Table 8–6
on page 101 for the number of registers). In this example, all 26
registers are used.
2. Calculate the number of bytes used for the 24 monthly records.
24 records (26 registers x 2 bytes/register) = 1,248
3. Calculate the number of bytes used for the 32 daily records.
32 (26 x 2) = 1,664
4. Calculate the number of bytes used each day.
96 (26 x 2) = 4,992
5. Calculate the number of days of 60-minute interval data recorded
by subtracting the values from steps 2 and 3 from the total log file
size of 65,536 bytes and then dividing by the value in step 4.
(65,536 – 1,248 – 1,664) ÷ 4,992 = 12 days
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