Significant mirroring events, such as established or lost connections and
configuration mismatches, are reported to the application via application events
(event channels APL_EVENT and HOST_ADDRESS_MISSING).
Diagnostic counters, implemented as APL object attributes, help monitoring the
traffic between the host and image application.
Because it is possible to create very large image applications by using the mirroring
function, the maximum number of STA base system objects
(MAX_STATION_NUMBER in SCIL) is 5000.
3.9.1. Station mapping
There are three station (STA:B) attributes that define the role and addressing of the
station in the mirroring network. The MR (Mirroring Role) attribute defines the role
of the station:
*
MR = "HOST": This is a host station that transmits the process data to one or
more image stations defined by the attribute IS
*
MR = "IMAGE": This is an image station that receives the process data from the
host station defined by the attribute HS
*
MR = "BOTH": This is an image station that receives the process data from the
host station defined by the attribute HS. Furthermore, it acts as a host station to
the image stations defined by the attribute IS
*
MR = "NONE": This station does not participate in mirroring (default)
The HS (host station) attribute of an image station object defines where the
corresponding host station is to be found. It has a list value with the following
attributes:
APL
The number of the (usually external) host application
UN
The unit number of the host station in the host application
The IS (Image Stations) attribute of a host station object defines where the
corresponding image stations are found. The attribute is a vector of up to 10 list
values with the following attributes:
APL
The number of the (usually external) image application
UN
The unit number of the image station in the image application
3.9.2. Process messages
In principle, all the messages from the station device to the host database are
replicated by the host database and sent to the image applications that have
subscribed to the object address. For the load control, however, some measurement
events can have been dropped, see 3.9.7. Buffering and communication breaks for
details. In a hierarchical mirroring network, the image application can also act as a
host and re-replicate the messages and send them further to their upper-level image
applications.
114
SYS 600 9.2SYS 600 9.2
MicroSCADA Pro
System Configuration
Configuration Manual
1MRS756112
(26 Seiten)
(21 Seiten)
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