3-32 Communications Date Code 20011026
SEL-321/321-1 Instruction Manual
The following self-tests are performed by dedicated circuitry in the microprocessor and the
SEL-321 Relay main board. Failures in these tests shut down the microprocessor and are not
shown in the STATUS report.
Self-Test
Condition
Limits
Protection
Disabled
ALARM
Output
Description
Micro-
processor
Crystal
Failure Yes Latched The relay monitors the
microprocessor crystal.
If the crystal fails, the
relay displays “CLOCK
STOPPED” on the LCD
display. The test runs
continuously.
Micro-
processor
Failure Yes Latched The microprocessor
examines each program
instruction, memory
access, and interrupt.
The relay displays
“VECTOR nn” on the
LCD upon detection of
an invalid instruction,
memory access, or
spurious interrupt. The
test runs continuously.
The relay settings become invalid by either: (1) setting LOGVAL or VALID to N using the SET
command, or (2) copying ROM default settings into EEPROM. This occurs when new
EEPROMs are installed in the relay, or when the relay is turned off and on after an EEPROM
failure.
TARGET
The target command displays the target values, and defines the target group used for each target
display. The relay maintains a separate target display for each relay display device (the serial
ports and the front-panel display).
Entering TARGET displays the currently selected target group. To view a different target, enter
the target number (0 - 48) after the target command: use TAR 15 to see target 15. (Note: The
number of targets varies with relay version and number of I/O boards - see Relay Elements in
Section 2: Specifications.) Subsequent TAR commands will now show target 15 as the default.
To view a particular target without changing the default, enter an "X" after the target number.
TAR 3 X shows target 3, but subsequent TAR commands will continue to show target 15. To
view a number of target samples, enter the number of times to view the target (1 - 32000) after
the target number. Enter TAR 44 1000 to repeatedly view the relay inputs on an SEL-321-1
Relay with one I/O board.
When showing multiple samples of targets, the target header repeats every eighth row.
The active target group for the particular display device defaults to TAR 1 when the device
(port/panel) times out, the QUIT command is executed, or the TAR R command is executed.
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