Sel SEL-421 - Fast Commands and Response Descriptions; Fast Operate Command Types

R.5.9
Date Code 20111215 Reference Manual SEL-421 Relay
SEL Communications Protocols
Protocol Active When Setting PROTO := SEL
Fast Operate commands use one of the two-byte command types shown in
Tab le 5.6. Each Fast Operate command also includes additional bytes that
specify a remote bit or circuit breaker bit.
The Fast Operate messages transfer control commands through the binary data
stream. You must enable Fast Operate messages for a port before the relay
accepts these messages on that port. In the port settings, when the protocol is
set to SEL, the FASTOP setting is visible. Set FASTOP :=Y to enable Fast
Operate commands or to N to disable Fast Operate commands.
General Fast Messages have a two byte identifier (A546h) and a function
code. Fast SER messages are general Fast Messages that transport Sequential
Event Recorder report information. The Fast SER messages include function
codes to accomplish different tasks. Table 5.7 lists the Fast SER function
codes and the actions the relay takes in response to each command.
Table 5.5 Fast Commands and Response Descriptions
Command (Hex) Name Description
A5B9h Status acknowledge message Clears Fast Meter status byte and
sends current status.
A5C0h Relay Fast Meter definition
block
Defines available Fast Meter mes-
sages and general relay configura-
tion information.
A5C1h Fast Meter configuration
block
Defines contents of Fast Meter data
message.
A5C2h Demand Fast Meter
configuration block
Defines contents of demand Fast
Meter data message.
A5C3h Peak demand Fast Meter
configuration block
Defines contents of peak demand
Fast Meter data message.
A5CEh Fast Operate configuration
block
Defines available circuit breaker,
remote bits, and associated com-
mands, if setting FASTOP :=Y for
this port.
A5D1h Fast Meter data message Defines present values of analog
and digital data.
A5D2h Demand Fast Meter data
message
Defines values of most recently
completed demand period.
A5D3h Peak demand Fast Meter data
message
Defines values for peak demands as
of end of most recently completed
demand periods.
Table 5.6 Fast Operate Command Types
Command (Hex) Name Description
A5E0h Fast Operate command
for remote bits
Sends command code that will change the
state of a remote bit, if setting FASTOP
:=Y for this port.
A5E3h Fast Operate command
for circuit breaker bits
Sends command code that will change the
state of a circuit breaker control bit, if set-
ting FASTOP :=Y for this port.