Schweitzer Engineering SEL-2032, Instruction Manual

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D.4
SEL-2032 Communications Processor Instruction Manual Date Code 20120126
System Planning Sheet
Calculate Memory Usage
For example, consider the case where you want to collect demand meter data
from an SEL-151 Relay every 15 minutes and want the SEL-2032 to store up
to 10 days worth of this data. This yields a total desired number of records of
960. From
Table D.1 , the memory requirement for 151 demand meter data is
n /3 + 2. Thus, the total number of blocks is (960/3) + 2 = 322.
RAM Usage
Estimation
In the SEL-2032, 1 MB of shared RAM is available. Of this, all but 4 KB is
available to the database. To determine the memory used by your planned
functions, sum the memory used for all database regions, including archive
regions.
User Region Memory
Memory requirements for the User region are 30 bytes + twice the USER
setting you enter with the
SET A command. (Be aware that the USER setting
may automatically increase when you use the SET M command.) If you are
using SET M , there will be an additional memory requirement of 30 bytes per
line in your SET M settings.
Data Region Usage
To estimate Data Region (D1–D8 and A1–A3) memory usage for “20” data
collection, use the record sizes directly from
Table D.3 . For non-20 data
collection, you determine the record sizes from the PARSE and NUM settings:
Table D.2 Archive Memory Usage Estimation
Port
Archive 1 Archive 2 Archive 3
No. of
Records
Record
Size
Number of
Blocks
No. of
Records
Record
Size
Number of
Blocks
No. of
Records
Record
Size
Number of
Blocks
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Total A1 Blocks
_____________
Total A2 Blocks
____________
Total A3 Blocks
_____________
A1 A2 A3 Blocks
=____________
Maximum available: = 7,168
Courtesy of NationalSwitchgear.com