ABB REC670 Applications Manual page 368

Section 14
Control
362
wants the reservation sends a reservation request to other bays and then waits for a
reservation granted signal from the other bays. Actual position 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 126.
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.
IED IED
. . .
ANSI05000117 V2 EN-US
Figure 126: Application principles for reservation over the station bus
The reservation can also be realized with external wiring according to the application
example in Figure 127. 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
RES_GRT
RES_RQ
3
RESIN
EXCH _IN
EXCH _ OUT
From other
. . .
SCSWI in
the bay
RESIN
EXCH _IN
EXCH _OUT
3
Station bus
1MRK 511 401-UUS A
QCRSV
RES_RQ1
. .
RES_RQ8
RES_GRT1 To other
. .
SCSWI
RES_GRT8
in the
RES_ DATA bay
2
en 05000117 _ansi . vsd
Bay control REC670 2.2 ANSI
Application manual