Creating Virtual Data Objects In The Logic Processor Opc Server - ABB COM600 3.4 User Manual

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3.5.
Station Automation COM600 3.4
Logic Processor User's Manual
7. The Direction field is used for setting the direction of the value transfer, either from
data object data attribute to logic variable (->) or from logic variable to data object
data attribute (<-).
8. After completing the configuration of cross-reference, click Apply to save the setting,
and close the Cross References tool.
The following special attribute names can be used in addition to those available in the
source data objects:
• With SPS and SPC: attribute EaCnt, that is incremented with 1 each time stVal is
updated with the value True. The value is reset to 0 each time stVal is updated with
the value False. This allows logic processor to catch several consecutive updates
of the object with the value True.
•
With SPC: new attribute EiCtlVal with the type Integer (VT_I4). It behaves as
ctlVal, so that writing a value > 0 corresponds to writing True to ctlVal. Writing
a value <= 0 corresponds to writing False to ctlVal. This allows logic to control
multiple times to the same direction, for example, by writing values 1, 2, 3, and so
on for True and 0, -1, -2, and so on for False.
Creating virtual data objects in the Logic Processor
OPC server
You can use virtual data objects for COM600 HMI or slave clients to access COM600
Logic Processor variables.
To add a logical node and a virtual data object:
1. Select a Logical Device object and right-click it.
2. Add a Logical Node object.
3. Select a Logical Node object and right-click it.
4. Add a data object.
5. Modify the object properties.
In the OPC Item Path property field, click the browse button with three dots to
open the PLC OPC Item Path logic variable dialog.
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