The LP (Load Control Policy) attribute of the station (STA:B) object defines which
analog events can be considered as measurement events according to the description
above. The attribute can take one of the following four values:
"KEEP_ALL_ANALOGS" No analog messages are taken as
measurements.
"KEEP_TIME_STAMPED_ANALOGS" The messages that are not time-
stamped by the station are taken as
measurements.
"KEEP_NO_ANALOGS" The analog messages are taken as
measurements whether they are time-
stamped or not.
"DEFAULT" The LP attribute of the corresponding
STY object is applied.
The station type (STY) objects have a similar LP attribute as well. STY:BLP defines
the default policy for all the stations of the type.
For the station types which have the DB attribute value "STA", the "DEFAULT"
policy is equivalent to "KEEP_TIME_STAMPED_ANALOGS". Otherwise the
default policy is "KEEP_NO_ANALOGS". For more information about the LP
attribute of station and station type objects, refer to the System Objects manual.
The AE (Analog Events) attribute of the station (STA:B) object is defined in the
host system. Its value is an integer or text vector of any length and it contains a list
of the analog input object addresses (OA) or OPC item names (IN) within the station
that are not to be taken as measurements in the sense described above.
3.9.8. Hot stand-by
HSB switch-overs are automatically taken care of, no SCIL command procedures
are involved.
To be able to do this, the base system must know which external applications make
up an HSB pair. Therefore, the SN (Shadowing Number) attribute of the external
applications that participate in mirroring must be set. Either of the two applications
numbers can be defined as the APL attribute of the HS or IS attribute of the stations
participating in the mirroring.
For example, if in an image system the external host applications 7 and 8 make up
an HSB pair, the SN attribute of APL7 must be set to 8 and the SN attribute of
APL8 must be set to 7. Either 7 or 8 can be defined as the APL attribute of the HS
attribute of the stations located in the host.
No events are lost due to HSB switch-overs because the mirroring event queues are
shadowed by the host application and the events are sequence-numbered. After an
HSB switch-over of the host or the image application, the image application asks the
host to retransmit all the events that are newer than the last received event.
118
SYS 600 9.2SYS 600 9.2
MicroSCADA Pro
System Configuration
Configuration Manual
1MRS756112
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