C.4
SEL-749M Relay Instruction Manual Date Code 20080918
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.
Ta b l e C .3 S E L 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
b
Telnet servers and clients
UCA2 GOMSFE
b
UCA2 protocol masters
UCA2 GOOSE
b
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
Courtesy of NationalSwitchgear.com
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