6.3
Date Code 20120126
Instruction Manual
SEL-2032 Communications Processor
Database
Database Structure
The Data regions D1–D8 and the Archive data regions A1–A3 store data
solicited by messages you create with the automatic message (SET A)
settings. The data you solicit using “20” messages are parsed automatically in
the associated data region. All of the “20” message responses will fit in any of
the Data regions, except the response to the 20EVENT, 20EVENTS, and
20EVENTL messages. These messages elicit an event report from an SEL
relay. Only the D3 and A3 data regions are large enough to hold an entire
20EVENT or 20EVENTS event report response and only the A3 data region is
large enough to hold a 20EVENTL event report response. Check the event
size of newer relays to determine if they will fit in the available regions.
DANGER:
Disconnect or
de-energize all external
connections before opening this
device. Contact with hazardous
voltages and currents inside this
device can cause electrical shock
resulting in injury or death.
!
You control the size of the data solicited with non-“20” messages based on the
parsing method you choose and the size of the message response you define
with the NUM
x
setting. If you specify a size larger than the region size, the
SEL-2032 will respond immediately with an “Out of Range” message.
The Data and Archive data regions of Ports 17 and 18 are controlled by the
installed protocol card. Refer to your protocol card instruction manual to
determine if, and how, these regions are used by the protocol card.
You can only reference those portions of regions that have data assigned. If
you reference an address that is not assigned, the SEL-2032 will respond with
a message that the data address does not exist.
You can allocate all, or a portion, of the User region with the
SET A
command, or the
SET M
command will automatically allocate the User
region. You must use the
STORE
command, user-defined write command, or
Modbus
®
write function code to put the data into this area. You may also use
SET M
to establish automatic storage of data into the User region.
Archive data regions are structured differently from other regions. Where all
other regions contain only a single record, the Archive data regions contain a
queue of records. From a data access point of view, the Archive data regions
appear to only contain the oldest record. However, as soon as it is cleared, the
next oldest record appears. The number of archive records that can be stored is
only limited by the amount of nonvolatile Flash memory. See
for more information.
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 data region queue; all other
commands read only the oldest record. See the memory calculation procedure
in
Appendix D: System Planning Sheet
for more information.
The SEL-2032 assigns Data and Archive data regions alternate labels or
names based on the data they store. 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.
Data
Storage Formats
Data are contained within the SEL-2032 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
Summary of Contents for SEL-2032
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