Sel Mirrored Bits Communication - Schweitzer Engineering Laboratories SEL-421-4 Instruction Manual

SEL M
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Communications Channels and Logical Data Channels
Date Code 20171006
B Communication
ITS
With SEL-patented M
and other devices can directly exchange information quickly, securely, and with
minimal cost. Use M
sensing, or communications-assisted protection schemes such as POTT and DCB.
SEL products support several variations of M
tocols. Through port settings, you can set the relay for compatible operation with
SEL-300 series relays, the SEL-2505 or SEL-2506 Remote I/O Modules, and the
SEL-2100 Protection Logic Processors. These devices use M
munications to exchange the states of eight logic bits. You can also use settings to
select extensions of the M
only in SEL-400 series relays, to exchange analog values, synchronize clocks,
and engage in virtual terminal dialogs. Table 15.23 summarizes M
communications features.
Table 15.23 M
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Feature
Transmit and receive logic bits
Transmit and receive analog values
Synchronize time
Send and receive virtual serial port characters
Support synchronous communications channel
The relay supports two M
and B. Use the port setting PROTO to assign one of the M
nications channels to a serial port: PROTO := MBA or MBGA for M
B communications Channel A or PROTO := MBB or MBGB for M
ITS
B communications Channel B.
ITS
Transmitted bits include TMB1A–TMB8A and TMB1B–TMB8B. The last letter
(A or B) designates with which channel the bits are associated. These bits are
controlled by SEL
RMB8A and RMB1B–RMB8B. You can use received bits as arguments in
SEL control equations. The channel status bits are ROKA, RBADA,
OGIC
CBADA, LBOKA, ROKB, RBADB, CBADB, LBOKB, DOKA, ANOKA,
DOKB, and ANOKB. You can also use these bits as arguments in SEL
trol equations. Use the COM command for additional channel status information.
Within each M
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B), there are eight logical data channels (1–8). In operation compatible with other
SEL products, you can use the eight logical data channels for TMB1–TMB8. If
you use fewer than eight transmit bits, Data Channel 8 is reserved to support data
framing and time synchronization features. You can assign the eight logical data
channels as follows:
Instruction Manual
B communications protocol, protective relays
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B communications for remote control, remote
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B communications protocols, available
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B Communications Features
ITS
Compatibility
SEL-300 series relays, SEL-2505, SEL-2506,
SEL-2100, SEL-400 series relays
SEL-400 series relays
SEL-400 series relays
SEL-400 series relays
SEL-400 series relays
B communications channels, designated A
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control equations. Received bits include RMB1A–
OGIC
B communications message for a given channel (A or
ITS
Communications Interfaces
SEL M B Communication
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B communications pro-
ITS
B com-
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B
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B commu-
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con-
OGIC
SEL-400 Series Relays
15.31