indications from these bays are then transferred over the station bus for evaluation
in the IED. After the evaluation the operation can be executed with high security.
This functionality is realized over the station bus by means of the function blocks
QCRSV and RESIN. The application principle is shown in Figure
.
The function block QCRSV handles the reservation. It sends out either the
reservation request to other bays or the acknowledgement if the bay has received a
request from another bay.
The other function block RESIN receives the reservation information from other
bays. The number of instances is the same as the number of involved bays (up to
60 instances are available). The received signals are either the request for
reservation from another bay or the acknowledgment from each bay respectively,
which have received a request from this bay. Also the information of valid
transmission over the station bus must be received.
en05000117.vsd
IED
IED
From other
SCSWI in
the bay
To other
SCSWI
in the
bay
3
Station bus
. .
.
. . .
. . .
3
RESIN
EXCH_OUT
EXCH_IN
RESIN
EXCH_OUT
EXCH_IN
..
SCSWI
RES_RQ
RES_GRT
RES_DATA
QCRSV
RES_RQ1
RES_RQ8
RES_GRT1
RES_GRT8
..
2
IEC05000117 V2 EN-US
Figure 43:
Application principles for reservation over the station bus
The reservation can also be realized with external wiring according to the
application example in Figure
. This solution is realized with external auxiliary
relays and extra binary inputs and outputs in each IED, but without use of function
blocks QCRSV and RESIN.
Section 8
1MRK 511 423-UEN A
Control
120
Bay control REC650 2.2 IEC
Application manual
