C.10
SEL-751 Relay Instruction Manual Date Code 20170927
SEL Communications Processors
SEL Communications Processor Example
Control Points
The SEL communications processor can automatically pass control messages,
called Fast Operate messages, to the SEL-751. You must enable Fast Operate
messages by using the FASTOP setting in the SEL-751 port settings for the
port connected to the SEL communications processor. You must also enable
Fast Operate messages in the SEL communications processor by setting the
automessage setting SEND_OPER equal to Y.
When you enable Fast Operate functions, the SEL communications processor
automatically sends messages to the relay for changes in remote bits RB01–
RB32 on the corresponding SEL communications processor port. For
example, if you set RB01 on Port 1 in the SEL communications processor, it
automatically sets RB01 in the SEL-751.
Breaker bit BR1 operates differently than remote bits. There is one breaker bit
in the SEL-751. For Circuit Breaker 1, when you set BR1, the SEL
communications processor sends a message to the SEL-751 that asserts the
OC bit for one processing interval. If you clear BR1, the SEL communications
processor sends a message to the SEL-751 that asserts the CC bit for one
processing interval. OC opens the breaker (via SEL
OGIC control equation TR)
and CC closes the breaker (via SEL
OGIC control equation CL). See
Figure 4.79 and Figure 4.80 for the breaker trip and breaker close logic
diagrams, respectively.
Demand Data
Table C.10 lists the demand data available in the SEL Communications
Processor and the location and data type for the memory areas within D3
(Data Region 3). The type field indicates the data type and size. The type “int”
is a 16-bit integer. The type “float” is a 32-bit IEEE floating point number.
280Ah See Ta ble K .1, Row 5
280Bh See Ta ble K .1, Row 6
280Ch See Ta ble K.1, Row 7
280Dh See Ta ble K .1, Row 8
280Eh See Ta ble K .1, Row 9
280Fh See Table K.1, Row 10
2810h See Table K.1, Row 11
2811h See Table K.1, Row 12
•
•
•
•
•
•
28A3h See Tab le K.1, Row 158
Table C.9 Communications Processor TARGET Region (Sheet 2 of 2)
Address
Relay Word Bits (in Bits 7–0)
7 6 5 4 3 2 1 0
NOTE: To use the Fast Operate
function, the Breaker jumper must be
installed (see Figure 2.7).
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