C.4
SEL-787 Relay
Instruction Manual
Date Code 20081022
SEL Communications Processors
SEL Communications Processor
Figure C.2
Multitiered SEL Communications Processor Architecture
You can add additional communications processors to provide redundancy and
eliminate possible single points of failure. SEL communications processors
provide an integration solution with a reliability comparable to that of SEL
relays. In terms of MTBF (mean time between failures), SEL communications
processors are 100 to 1000 times more reliable than computer-based and
industrial technology-based solutions.
Configuration of an SEL communications processor is different from other
general-purpose integration platforms. You can configure SEL
communications processors with a system of communication-specific
keywords and data movement commands rather than programming in C or
another general-purpose computer language. SEL communications processors
offer the protocol interfaces listed in
Table C.3
SEL
Communications Processors Protocol Interfaces
Protocol
Connect to
DNP3 Level 2 Slave
DNP3 masters
Modbus
®
RTU Protocol
Modbus masters
SEL ASCII/Fast Message Slave
SEL protocol masters
SEL ASCII/Fast Message Master
SEL protocol slaves including other
communications processors and SEL relays
ASCII and Binary auto messaging
SEL and non-SEL IED master and slave devices
Modbus Plus
a
a
Requires SEL-2711 Modbus Plus protocol card.
Modbus Plus peers with global data and Modbus
Plus masters
FTP (File Transfer Protocol)
b
b
Requires SEL-2701 Ethernet Processor.
FTP clients
Telnet
Telnet servers and clients
UCA2 GOMSFE
UCA2 protocol masters
UCA2 GOOSE
UCA2 protocol and peers
SEL Communications
Processor
To Engineering
Modem
To SCADA
Local HMI
SEL IED
SEL IED
SEL IED
Non-SEL IED
SEL IED
SEL IED
SEL IED
Non-SEL IED
SEL Communications
Processor
SEL Communications
Processor
Summary of Contents for SEL-787
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