7.12
SEL-751A Relay Instruction Manual Date Code 20100129
Communications
Communications Protocols
MIRRORED BITS Protocol
The SEL-751A supports two MIRRORED BITS communications channels,
designated A and B. Within each M
IRRORED BITS communications message
for a given channel (A or B), there are eight logical data channels (1–8). You
can, for example, set MBA on Port 3 of the base unit and MBB on Port 4A of
the optional communications card. Attempting to set the PROTO setting to
MBA, MB8A, or MBTA when channel A is already assigned to another port
(or MBB, MB8B, or MBTB when channel B is already assigned on another
port) results in the following error message:
This Mirrored Bits channel
is assigned to another port.
After displaying the error message, the
device returns to the PROTO setting for reentry.
C37.118 Protocol
The SEL-751A provides C37.118 protocol (synchrophasor data) support at
one of the serial ports F, 2, 3, or 4. The protocol is described in Appendix H:
Synchrophasors.
Modbus RTU Protocol
The SEL-751A provides Modbus RTU support. Modbus is an optional
protocol described in Appendix E: Modbus RTU Communications.
DNP3 (Distributed Network Protocol)
The SEL-751A provides DNP3 protocol support if the option is selected. The
DNP3 protocol is described in Appendix D: DNP3 Communications.
DeviceNet Protocol
The SEL-751A provides DeviceNet Support. DeviceNet is an optional
protocol described in Appendix G: DeviceNet Communications.
Ethernet Protocols
As with other communications interfaces, you must choose a data exchange
protocol that operates over the Ethernet network link in order to exchange
data. The relay supports FTP, Telnet, Ping, Modbus/TCP, DNP3 LAN/WAN,
and IEC 61850 protocols.
You should carefully design your Ethernet network to maximize reliability,
minimize system administration effort, and provide adequate security. Work
with a networking professional to design your substation Ethernet network.
FTP Server
Use the single FTP (File Transfer Protocol) session to access the following
files:
CFG.XMLConfiguration read-only file in XML format
CFG.TXTConfiguration read-only file in TXT format
ERR.TXTError read-only file in text format
SET_61850.CIDIEC 61850 CID read-write file
SET_xx.TXTSetting files in TXT format
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