Product specifications
SPlus Operations P13 Connectivity Guide PROCONTROL P13 OPC SERVER
44 2VAA001153C
Control objects implement the corresponding commands and give access to the associated feedback signals. To issue
a command, some object individual identification signals are sent Procontrol
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. The association of these feedback and
identification signals to its control object is defined by a corresponding naming convention for PVs.
Figure 3-29: Control Objects and associated Signals
3.4.2.2 Naming Conventions for Process Variables
As mentioned above a specific naming convention is assumed in respect to control objects. Control objects are
associated with several individual process variables. In particular the necessary feedback information is provided as a
set of DI process signals. Similarly identification signals are represented as DO process signals. The compositional view
on a CO object is achieved by an appropriate naming convention:
Control object id:
Control object name (Alpha-numeric string, typical
Name of associated Signals:
<ControlObjectName>_<SignalCode>
where:
ControlObjectName Name of the control object, 12 characters
SignalCode: Code for Signal
Signal Code
This convention is defined in [PMSMimicSignal]
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Example:
Control object: 12MAW10AA001
Control object id: 12MAW10AA001_
12MAW10AA001_XL78
12MAW10AA001_XL18
12MAW10AA001_CMD_OPEN
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This naming convention allows building generic object GUI components (Faceplates, Symbols) per control object type.
This means, that for such components, only the control object name has to be provided. The individual signal items can
be referenced by the signal code relatively to the object name.
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The details of object identification depends on the VPC mode used for a site.
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Command OPC Items correspond to properties of the control object but not to an individual PV.
Feedback Signals
Identification signals
By Naming
Conventio
n
By Naming
Conventio
n
OPC Client
OPC Items
DI
CO
Commands
ACKN
ON
OFF
..
DO