C.10
SEL-749M Relay Instruction Manual Date Code 20080918
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-749M. You must enable Fast
Operate messages by using the FASTOP setting in the SEL-749M 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 RB1–
RB8 on the corresponding SEL communications processor port. In this
example, if you set RB1 on Port 1 in the SEL communications processor, it
automatically sets RB1 in the SEL-749M.
Breaker bit BR1 operates differently than remote bits. There are no breaker
bits in the SEL-749M. For Circuit Breaker 1, when you set BR1, the SEL
communications processor sends a message to the SEL-749M that asserts the
motor stop bit STOP for one processing interval. If you clear BR1, the SEL
communications processor sends a message to the SEL-749M that asserts the
motor start bit STR for one processing interval. STOP will stop the motor and
STR will start the motor. See Figure 4.20 and Figure 4.23 for the motor stop
and start logic diagrams, respectively.
280Ah See Table G.1, Row 4
280Bh See Table G.1, Row 5
280Ch See Table G.1, Row 6
280Dh See Table G.1, Row 7
280Eh See Table G.1, Row 8
280Fh See Table G.1, Row 9
2810h See Table G.1, Row 10
2811h See Table G.1, Row 11
•
•
•
•
•
•
2827h See Table G.1, Row 32
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
Courtesy of NationalSwitchgear.com
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