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 107.
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
IEDIED
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 107: Application principles for reservation over the station bus
The reservation can also be realized with external wiring according to the application example
in Figure
108. 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.
SCSWI
SELECTED
RES_EXT
+
IED
BI
BO
IED
BI
BO
OR
Other SCSWI in the bay
en05000118.vsd
IEC05000118 V2 EN-US
Figure 108: Application principles for reservation with external wiring
Section 13 1MRK 511 358-UEN A
Control
262
Application manual
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