Schweitzer Engineering Laboratories SEL-2020, Instruction Manual

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Date Code 20010518 General Description 2-7
SEL-2020 Instruction Manual
Table 2.1 lists the Global elements as they are stored in the Global data region. A brief
description of these elements and their function follows the table.
Table 2.1: SEL-2020 Global Elements
Row Global Elements
0 SUN MON TUE WED THU FRI SAT IRIG
1 V W X XT Y YT Z ZT
2 R1 R2 R3 R4 R5 R6 R7 R8
3 PINAC PCF INAC SDLY * * * SALARM
4 IN8 IN7 IN6 IN5 IN4 IN3 IN2 IN1
5 IN16 IN15 IN14 IN13 IN12 IN11 IN10 IN9
6 OUT1 OUT2 OUT3 OUT4 * * * *
Row 0: Day-of-Week elements, SUN through SAT; one is asserted each day of the week; and
external IRIG-B status element is asserted when the SEL-2020 detects the external
IRIG-B signal.
Row 1: Intermediate Variable elements, V, W, X, Y, and Z, are asserted when the
corresponding intermediate logic equation is true; and associated timer elements, XT,
YT, and ZT, are asserted when the pickup timer times out until the dropout timer times
out.
Row 2: Remote elements, R1 to R8, are set, cleared, or pulsed by the CONTROL command.
Row 3: SEL-2020 Status elements indicate a port is inactive pending auto-configuration
(PINAC); a port has failed power-up auto-configuration (PCF); at least one port is
inactive because it is not responding or not responding correctly (INAC); there has
been at least one data collection missed since the last STATUS command (SDLY); and
alarm pulse (SALARM).
Row 4: External Input elements, IN1 to IN8, are asserted when the associated external input is
asserted (only available with optional I/O board).
Row 5: External Input elements, IN9 to IN16, are asserted when the associated external input
is asserted (only available with optional I/O board).
Row 6: External Output elements, OUT1 to OUT4, are asserted when the associated external
output contact operates (only available with optional I/O board). These elements are
controlled by SEL
OGIC
Control Equations.
All bit positions indicated with an * are reserved for future use.
Local Region
The Local region includes the following information which is unique to each port: