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Database
Date Code 20010518
SEL-2020 Instruction Manual
archive region is the amount of available non-volatile Flash memory. These data regions are
only usable if optional nonvolatile Flash memory is installed in the SEL-2020. (Confirm the
presence of nonvolatile Flash memory using the STATUS command.)
In the LOCAL Data Region of the database, counters are maintained for each Archive data
region indicating the number of records currently queued up. You can view the archived data
records with the VIEW command, or you can read the archived data records with an auto-
message using the \F.../ formatted read message string. You can remove archived data records
using the CLEAR or VIEW C commands, you can include the ;C or ;CA modifiers in a \F.../
string, or you can use the Clear Archive Register in the Local Data region.
CAUTION
!
Frequent archive record clearing may exceed EEPROM capabilities.
Refer to the following paragraphs.
Carefully consider the method used for archive record clearing to ensure the SEL-2020
EEPROM does not experience premature failure. Every time an archive record(s) is cleared, a
register corresponding to that port and region is updated. The EEPROM is guaranteed to support
100,000 writes; therefore, select a clearing method that will not clear any specific region more
than 100,000 times.
The best way to minimize clearing operations is to use the CLEAR A command or the \F...;CA/
string to clear archive records on a periodic basis. These methods only cause one EEPROM
update, while clearing a potentially large number of records. Use
Appendix E: Planning Sheets
to determine memory usage and necessary clearing frequency.
If the archive memory becomes full, the SEL-2020 will not store any new records until enough
archive memory is freed up. Use the MEMORY command to check how full the memory is.
You can use the planning guides in
Appendix E: Planning Sheets
to determine how much data
will fit in the archive and plan your clearing method accordingly.
User-Defined Data (USER)
You can use this data region for whatever purpose you desire. When you are using DNP
communications this is where the data is read from (see
Appendix I: Distributed Network
Protocol (DNP) V 3.00
for more information). Data can be put in this data region by writing
from a master device using either the STORE command or the user-defined data WRITE
command. Data can also be stored in this data region automatically using the SET M command.
Any port may then use this data in constructing messages. Use SET A to enable this region.
SET M will also enable this region if it was not previously set using SET A.
A
CCESS
M
ETHODS
You can access data contained within the database by function, region, register, or bit.
Access by Function
You can access much of the data within the database based on its function; you do not need to
know where it is in the database to reference it. The following commands access database infor-
mation by function:
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