9-16 Database Date Code 20010518
SEL-2020 Instruction Manual
Table 9.7: Local Element Definitions (continued)
Element Description
RB1 Local latch result which may be associated with Remote Bit 1.
RB2 Local latch result which may be associated with Remote Bit 2.
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RB16 Local latch result which may be associated with Remote Bit 16.
SBR1 Intermediate result which sets element BR1.
SBR2 Intermediate result which sets element BR2.
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SBR16 Intermediate result which sets element BR16.
SRB1 Intermediate result which sets element RB1.
SRB2 Intermediate result which sets element RB2.
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SRB16 Intermediate result which sets element RB16.
CBR1 Intermediate result which clears element BR1.
CBR2 Intermediate result which clears element BR2.
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CBR16 Intermediate result which clears element BR16.
CRB1 Intermediate result which clears element RB1.
CRB2 Intermediate result which clears element RB2.
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CRB16 Intermediate result which clears element RB16.
Unsolicited Message Queue (BUF)
The unsolicited message queue contains all unsolicited messages received from an IED. You
must set AUTOBUF=Y with the SET A command for unsolicited messages to be stored here.
Use the CLEAR m:BUF or VIEW m:BUF C commands periodically to clear the message queue
so data are not overwritten. Alternatively, a \DACn/ string can clear these buffers.
At the top of the BUF region are two registers, Start Index and End Index (see Table 9.8), that
contain register offsets. The Start and End Indices reference the beginning address of the
circular buffer (1002h) to determine the address of the start and end of data. The first offset
points to the address of the beginning of unread data. The second offset points to the address just
beyond the last unread data. The SEL-2020 maintains the second offset. If you reference these
data by region with VIEW, CLEAR, or \DAC string, the SEL-2020 maintains the first index for
you. If you are directly reading the data (using VIEW by address, or user-defined READ
command) you must maintain the first offset as data are read.
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