Schweitzer Engineering Laboratories SEL-2020 - Database Structure; Introduction; Section 9: Database

Date Code 20010518 Database 9-1
SEL-2020 Instruction Manual
SECTION 9: DATABASE
INTRODUCTION
The SEL-2020 database contains status information and data collected from devices attached to
the 16 rear communication ports. This section describes the structure of the database and the
various ways data within the database can be accessed.
DATABASE STRUCTURE
The SEL-2020 data area includes a database for each of the 16 rear communication ports. Each
port database consists of up to 15 regions, including Global (GLOBAL), Local (LOCAL),
Unsolicited Message Buffer (BUF), eight Data regions (D1 to D8), three Archive regions (A1 to
A3), and a User data region (USER). Global, Local, and User regions are available on all used
ports. The unsolicited message buffer (BUF) and Data regions are available on ports with SEL
IED and other IED device types. The Archive data regions are available on IED ports if the
SEL-2020 is equipped with optional nonvolatile Flash memory. The first data region (D1) and
Archive data region (A1) are available on Master ports for use with the 20USER setting (see
Section 8: Message Strings for more information). Figure 9.1 illustrates the overall database
structure.
Table 9.1 provides detailed information about each port’s database. More detailed information
about each region is located in this section under Region Descriptions.
GLOBAL
1:LOCAL
1:BUF
1:D1
1:D2
1:D8
1:A1
1:A2
1:A3
1:USER
.
.
.
.
PORT 1
GLOBAL
2:LOCAL
2:BUF
2:D1
2:D2
2:D8
2:A1
2:A2
2:A3
2:USER
.
.
.
.
PORT 2
GLOBAL
16:LOCAL
16:BUF
16:D1
16:D2
16:D8
16:A1
16:A2
16:A3
16:USER
.
.
.
.
PORT 16
2:A1
2:A2
2:A3
DWG: M2020_DBStr
.
.
.
.
Figure 9.1: Overall Database Structure