PLC Programming

Declaration Editor...
The variable name you entered in the editor has been entered in the Name field, BOOL has been
placed in the Type field. The button opens the Input Assistant dialog which allows you to select
from all possible data types.
If ARRAY is chosen as the variable type, the dialog for entering array boundaries appears.
Dialog for determining array boundaries during automatic declaration
.
For each of the three possible dimensions (Dim.), array boundaries can be entered under Start and
End by clicking with the mouse on the corresponding field to open an editing space. The array data
type is entered in the Type field. In doing this, the
dialog.
button can be used to call up an input assistant
Upon leaving the array boundaries dialog via the OK button, variable declarations in IEC format are
set up based on the entries in the Type field in the dialog. Example: ARRAY [1..5, 1..3] OF INT
In the field Initial value, you may enter the initial value of the variable being declared. If this is an
array or a valid structure, you can open a special initialization dialog via the
input assistant dialog for other variable types.
button or , or open the
In the initialization dialog for an array you are presented a list of array elements; a mouse click on the
space following „:="opens an editing field for entering the initial value of an element.
In the initialization dialog for a structure, individual components are displayed in a tree structure. The
type and default initial value appear in brackets after the variable name; each is followed by „:=". A
mouse click on the field following „:=" opens an editing field in which you can enter the desired initial
value. If the component is an array, then the display of individual fields in the array can be expanded
by a mouse click on the plus sign before the array name and the fields can be edited with initial
values.
After leaving the initialization dialog with OK, the initialization of the array or the structure appears in
the field Initial value of the declaration dialog in IEC format.
Example: x:=5,field:=2,3,struct2:=(a:=2,b:=3)
In the Address field, you can bind the variable being declared to an IEC address (AT declaration).
If applicable, enter a Comment. The comment can be formatted with line breaks by using the key
combination + .
By pressing OK, the declaration dialog is closed and the variable is entered in the corresponding
declaration editor in accordance to the IEC syntax.
Note:
The dialog box for variable declaration you also get by the command 'Edit' 'Declare Variable'. If the
cursor is resting on a variable in Online mode, the Autodeclare window can be opened with
with the current variable-related settings displayed.
Line Numbers in the Declaration Editor
In offline mode, a simple click on a special line number will mark the entire text line.
5-8 CoDeSys V2.3