Product specifications

SPlus Operations P13 Connectivity Guide PROCONTROL P13 OPC SERVER
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Figure 3-30: OPC Items for an ASE Control Object in a browser
To follow this naming convention is a matter of engineering and must be observed when building the object GUI
components.
Because naming convention as described above has not been observed consequently within projects and not in all
projects the same signal names have been used, a mechanism to map existing signal names to a unified naming
convention must be provided. This is achieved by the possibility to optionally provide an alias name to process variables
(except CO variables). By using Extended PVs (see3.4.2.3Extended Process Variables), this concept is supported in a
convenient way.
If an alias name is given for a PV, this PV has two names in the process image database and as OPC item. This allows
having a PV under the same name as it had within the old system also in case this original name does not fulfill the
control object naming convention.
The naming convention for PVs is also mapped to the naming convention for the corresponding OPC items. Therefore
see also 3.4.1.1 Naming Conventions for OPC Item.
3.4.2.3 Extended Process Variables
For process signals and control objects two PV types are provided:
 Standard PV
These types provide basic value processing and event processing. Configuration of feedback signals for a
control object is not possible.
 Extended PV
Extended PVs provide some additional functionality and additional attributes. In particular the feedback signals
for a control object are individually configurable.
appended.
3.4.3 Access to Control System Data
3.4.3.1 General
The control system database contains an image of the control system data on the connected local stations. The
PServer exposes the Procontrol data words as data items. These data items follow the naming convention as shown in
the following diagram.
Figure 3-31: Naming Convention for Control System data Items
#_2.1E.3F
Control System Database
Bus Address
Station Address
Device address