Schweitzer Engineering SEL-2032, Instruction Manual

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6.21
Date Code 20120126 Instruction Manual SEL-2032 Communications Processor
Database
Region Descriptions
Then you would map the SV3 element in your SER setting to the relay. Finally
you would monitor SV3 from the STATE region in the SEL-2032:
0:0;B = 3:STATE:SV3
You will then be monitoring the inverted state of the 52a at the DNP master.
See specific protocol sections for more information on using the STATE
region area.
The connected SEL device collects and transmits data for the STATE region
using the SER function. This means that available data and data organization
within the SEL-2032 are affected by the SER settings in the device. If you
change SER settings in the connected device (for example, an SEL relay), you
must also modify references to the STATE region within the SEL-2032 to
reflect the changes.
Archive
Data Regions
The Archive data regions (A1–A3) are very similar to the Data regions.
However, in the Archive data regions, data are stored in nonvolatile Flash
memory. Each data region acts as a queue, buffering multiple responses. Each
record can be as large as the data region. The only limit on the number of
records you can store in an Archive data region is the amount of available
nonvolatile Flash memory.
NOTE
: If you completely clear an
Archive data region that contains a
large number of records (thousands of
records), it may take a few minutes
for the clearing to complete. During
this time, most SEL-2032 automatic
data collection will be suspended.
In the Local 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 region.
NOTE
: 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-2032 archive memory 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 archive memory EEPROM is guaranteed to support
100000 writes; therefore, select a clearing method that will not clear any
specific region more than 100000 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 D: System Planning Sheet to
determine memory usage and necessary clearing frequency.
If the archive memory becomes full, the SEL-2032 will not store any new
records until enough archive memory is freed up. Use the
MEMORY
command to check how full the memory is.
User Region
You can use the User region (USER) for whatever purpose you desire. When
using DNP3 communications you read the data from this region (see
Section 9: Protocols for more information). Data can be put in this 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 region
automatically using the SET M command. Any port may then use these 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 .
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