Date Code 20010518
Database
9-3
SEL-2020 Instruction Manual
Table 9.1: Database Regions for a Single Port
Address
Region From
To
Register
Size
Global Data
0000h
07FFh
2 k
Local Data
0800h
0FFFh
2 k
BUF (Unsolicited Message Queue)
1000h
1FFFh
4 k
Data Region 1
2000h
27FFh
2 k
Data Region 2
2800h
2FFFh
2 k
Data Region 3
3000h
47FFh
6 k
Data Region 4
4800h
4FFFh
2 k
Data Region 5
5000h
57FFh
2 k
Data Region 6
5800h
5FFFh
2 k
Data Region 7
6000h
67FFh
2 k
Data Region 8
6800h
6FFFh
2 k
Archive Data Region 1
7000h
77FFh
2 k
Archive Data Region 2
7800h
7FFFh
2 k
Archive Data Region 3
8000h
F7FFh
30 k
User-Defined Data Region
F800h
FFFFh
2 k
Archive regions are only available if the SEL-2020 is equipped with optional nonvolatile Flash
memory. The nonvolatile nature of these data regions, combined with the unique capability to
contain multiple records, make them ideally suited to long-term data collection and storage. You
can use the VIEW command to view the data associated with any record in the Archive region
queue; all other commands read only the oldest record. See the memory calculation procedure in
Appendix E: Planning Sheets
for more information.
The SEL-2020 assigns Data and Archive regions alternate labels or names based on the data
stored in them. For instance, if you use the 20METER message to collect and store SEL relay
meter data in Data region D1, that region is assigned the alternate label “METER”. Use the
MAP command to view a list of regions on a port and any alternate labels associated with some
of the regions.
You can also use the MAP command to show the detailed structure of any region.
D
ATA
S
TORAGE
F
ORMATS
Data are contained within the SEL-2020 database in various formats. Character items and strings
are stored with each character requiring one register but only using the lower byte of the register;
the high byte is always zero. Any unused characters in a string are set to a value of zero. Integer
items require a complete register. Real numbers are stored in IEEE single-precision floating-
point format in two registers with the most-significant word stored in the lower-addressed
Summary of Contents for SEL-2020
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