Sel SEL-421 - Unbuffered Report Control Block Client Access

R.8.7
Date Code 20111215 Reference Manual SEL-421 Relay
IEC 61850 Communications
IEC 61850 Operation
Similarly, for unbuffered reports, connected clients may edit the report
parameters shown in Table 8.5 .
For buffered reports, only one client can enable the RptEna attribute of the
BRCB at a time resulting in a client association for that BRCB. Once enabled,
the associated client has exclusive access to the BRCB until the connection is
closed or the client disables the RptEna attribute. Once enabled, all
unassociated clients have read only access to the BRCB.
For unbuffered reports, up to six clients can enable the RptEna attribute of an
URCB at a time resulting in multiple client associations for that URCB. Once
enabled, each client has independent access to a copy of that URCB.
The Resv attribute is writable, however, the SEL-421 does not support
reservations. Writing any field of the URCB causes the client to obtain their
own copy of the URCB-in essence, acquiring a reservation.
Reports are serviced at a 2 Hz rate. The client can set the IntgPd to any value
with a resolution of 1 ms. However, the integrity report is only sent when the
period has been detected as having expired. The report service rate of 2 Hz
results in a report being sent within 500 ms of expiration of the IntgPd. The
new IntgPd will begin at the time that the current report is serviced.
Table 8.5 Unbuffered Report Control Block Client Access
RCB Attribute
User Changeable
(Report Disabled)
User Changeable
(Report Enabled)
Default Values
RptId YES FALSE
RptEna YES YES FALSE
Resv YES FALSE
OptFlds YES segNum
timeStamp
dataSet
reasonCode
dataRef
BufTm YES 250
TrgOps YES dchg
qchg
IntgPd YES FALSE
GI YES
a
a
Exhibits a pulse behavior. Write a one to issue the command. Once command is accepted will
return to zero. Always read as zero.
0