5. CONFIGURATION
Figure 86: Symbol Configuration Object
The table below presents the descriptions of the Symbol Configuration object screen fields.
Field Description
Symbols Variable identifier that will be provided to the OPC DA Server.
Access Rights
Indicates what the possible access right level are in the declared
symbol. When not utilized, this column remains empty, and the
access right level is maximum. Otherwise the access right level
can be modified by clicking over this field. The possible options
are:
Read only
Write only
Read and Write
Maximal
Indicates the maximum access right level that is possible to as-
sign to the variable. The symbols hold the same meanings from
the ones in Access Rights. It’s not possible to change it and it’s
indicated by the presence or not of the attribute ’symbol’
Attribute
Indicates if attribute ’symbol’ is being used when the variable is
declared. When not used, this column remains empty. For the
cases in which the attribute is used, the behavior is the follow-
ing:
attribute ’symbol’ := ’read’ the column shows
attribute ’symbol’ := ’write’ the column shows
attribute ’symbol’ := ’readwrite’ the column shows
Type Data type of the declared variable.
Members
When the data type is a Struct, a button is enabled in this col-
umn. Clicking on the button will allow the selection of which
elements of that struct will be provided to the OPC DA Server.
Comment
Variable comment, inserted on the POU or GVL where the vari-
able was declared. To show up as a variable comment here, the
comment must be entered one line before the variable on the
editor, while in text mode, or in the comment column when in
tabular mode.
Table 127: Symbol Configuration object screen fields description
When altering the project settings, such as adding or removing variables, it’s necessary to run the command Build, in
order to refresh the list of variables. This command must be executed until the message in Figure 86 disappear. After this, all
available variables in the project, whether they are declared on POUs, GVLs or diagnostics, will be shown here and can be
selected. The selected variables will be available on the OPC DA Server to be accessed by the Clients.
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