General columns in the signal table
For a description of the general signal table columns see Columns in tables with analog and digital signals.
Item ID
The entries in this column are filled-in automatically when adding OPC variables with
the OPC browser. If you want to change an item ID, just click in the corresponding
field and then on the browser button 
. The OPC browser opens again and you can select another signal.
Of course, you can directly enter the item ID as well. When moving the mouse over the signal, you will get information in the tooltip on whether or not the signal is valid.
Tip |
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Always use the OPC browser. Beside an easier selection and avoiding typing errors, there is an automatic data type verification. E.g., if you select a binary OPC variable for input in the analog signal table, the OPC browser marks this data type conflict with a red-colored field in the data type display and disables the <OK> button. This ensures that only data of the appropriate type is entered in the signal tables. |