controller SCSWI. If the bay already is reserved the command sequence will be reset
and the SCSWI will set the attribute "1-of-n-control" in the "cause" signal.
Reservation of other bays
When the function QCRSV receives a request from an apparatus in the own bay that
requires other bays to be reserved as well, it checks if it already is reserved. If not, it
will send a request to the other bays that are predefined (to be reserved) and wait for
their response (acknowledge). The request of reserving other bays is done by
activating the output RES_BAYS.
When it receives acknowledge from the bays via the input RES_DATA, it sets the
output RES_GRTx (where x=1-8 is the number of the requesting apparatus). If not
acknowledgement from all bays is received within a certain time defined in SCSWI
(
tResResponse
), the SCSWI will reset the reservation and set the attribute "1-of-n-
control" in the "cause" signal.
Reservation request from another bay
When another bay requests for reservation, the input BAY_RES in corresponding
function block RESIN is activated. The signal for reservation request is grouped into
the output signal EXCH_OUT in RESIN, which is connected to input RES_DATA in
QCRSV. If the bay is not reserved, the bay will be reserved and the acknowledgment
from output ACK_T_B is sent back to the requested bay. If the bay already is reserved
the reservation is kept and no acknowledgment is sent.
Blocking and overriding of reservation
If QCRSV function is blocked (input BLK_RES is set to true) the reservation is
blocked. That is, no reservation can be made from the own bay or any other bay. This
can be set, for example, via a binary input from an external device to prevent
operations from another operator place at the same time.
The reservation function can also be overridden in the own bay with the OVERRIDE
input signal, that is, reserving the own bay without waiting for the external
acknowledge.
Bay with more than eight apparatuses
If only one instance of QCRSV is used for a bay that is, use of up to eight apparatuses,
the input EXCH_IN must be set to FALSE.
If there are more than eight apparatuses in the bay there has to be one additional
QCRSV. The two QCRSV functions have to communicate and this is done through
the input EXCH_IN and EXCH_OUT according to Figure
. If more than one
QCRSV are used, the execution order is very important. The execution order must be
in the way that the first QCRSV has a lower number than the next one.
Section 14
1MRK502052-UEN B
Control
738
Technical manual
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