Schweitzer Engineering Laboratories SEL-751 - Communications Protocol

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SEL-751 Relay Instruction Manual Date Code 20170927
Preface
Manual Overview
Appendix B: Firmware Upgrade Instructions. Describes the procedure to
update the firmware stored in flash memory.
Appendix C: SEL Communications Processors. Provides examples of how
to use the SEL-751 with SEL communications processors for total
substation automation solutions.
Appendix D: DNP3 Communications. Describes the DNP3 protocol support
provided by the SEL-751.
Appendix E: Modbus RTU Communications. Describes the Modbus
protocol support provided by the SEL-751.
Appendix F: IEC 61850 Communications. Describes IEC 61850
implementation in the SEL-751.
Appendix G: IEC 60870-5-103 Communications. Describes the IEC 60870-
5-103 protocol support provided by the SEL-751.
Appendix H: DeviceNet Communications. Describes the use of DeviceNet
(data-link and application protocol) over CAN (hardware protocol).
Appendix I: Synchrophasors. Describes the Phasor Measurement Control
Unit (PMCU), and accessing synchrophasor data through the use of
IEEE C37.118 Protocol.
Appendix J: MIRRORED BITS Communications. Describes how SEL protective
relays and other devices can directly exchange information quietly,
securely, and with minimum cost.
Appendix K: Relay Word Bits. Lists and describes the Relay Word bits
(outputs of protection and control elements).
Appendix L: Analog Quantities. Lists and describes the Analog Quantities
(outputs of analog elements).
Appendix M: Cybersecurity Features. Describes a number of features to
help meet cybersecurity design requirements.
SEL-751 Relay Command Summary. Briefly describes the serial port
commands that are fully described in Section 7: Communications.