Date Code 20010518 General Description 2-9
SEL-2020 Instruction Manual
Message-Buffer element, UMB, asserts when a message is stored in the port
BUF region.
Row 2: Message trigger elements, D1 to D8, set when the associated trigger operation
is pending or in progress.
Row 3: Message trigger elements, D9 to D12, and Archive region trigger elements,
ARCH1 to ARCH3, set when the associated trigger operation is pending or in
progress. M settings element, MSET, is asserted while the Math/Move
equations for the port are executing.
Row 4: Message trigger delay elements, DLY1 to DLY8, assert when the associated
message trigger element, D1 to D8, does not reset before the next trigger
condition occurs, indicating a possible data collection delay or message error.
Row 5: Message trigger delay elements, DLY9 to DLY12 and DLYA1 to DLYA3,
assert when the associated message trigger element, D9 to D12 or ARCH1 to
ARCH3, does not reset before the next trigger condition occurs, indicating a
possible data collection delay or message error.
Rows 6 - 7: Breaker bits (BR1 - BR16) may be associated with issuing breaker operate
commands (OPEN/CLOSE) or may be used as latches for intermediate
SEL
OGIC Control Equations. These bits are set by the SBR1 - SBR16 elements
and cleared by the CBR1 - CBR16 elements.
Rows 8 - 9: Remote bits (RB1 - RB16) may be associated with issuing remote bit
commands (CONTROL) or may be used as latches for intermediate SEL
OGIC
Control Equations. These bits are set by the SRB1 - SRB16 elements and
cleared by the CRB1 - CRB16 elements.
Rows 10 - 13: Set breaker (SBR1 - SBR16) and set remote bit (SRB1 - SRB16) elements set
the corresponding breaker and remote bit elements, but may also be used as
intermediate terms for SEL
OGIC Control Equations. These bits are controlled
by logic equations (SET L) and by receipt of master port Fast Operate
commands.
Rows 14 - 17: Clear breaker (CBR1 - CBR16) and clear remote bit (CRB1 - CRB16) elements
clear the corresponding breaker and remote bit elements, but may also be used
as intermediate terms for SEL
OGIC Control Equations. These bits are
controlled by SEL
OGIC Control Equations (SET L) and by receipt of master
port Fast Operate commands.
You can use the VIEW or TARGET command to show Local element status.
BUF Region
The BUF region contains buffered unsolicited messages from its associated port if you have set
AUTOBUF to Yes. The buffer accumulates messages until it is full, at which point the newest
message overwrites the oldest message. The buffer can be read and cleared in a number of ways
both manually and automatically.
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