PLC Programming

4 - The Individual Components
In the case of a POU, the POU type (program, function or function block) and the language in which it
is programmed must also be selected. 'Program' is the default value of Type of the POU, while that of
Language of the POU is that of most recently created POU. If a POU of the function type is created,
the desired data type must be entered in the Return Type text input field. Here all elementary and
defined data types (arrays, structures, enumerations, aliases) are allowed. Input assistance (e.g. via
) can be used.
Dialog for creating a new POU
After pressing OK, which is only possible if there is no conflict with the naming conventions described
above, the new object is set up in the Object Organizer and the appropriate input window appears.
If the command 'Edit' 'Insert' is used, the object currently in the clipboard is inserted and no dialog
appears. If the name of the inserted object conflicts with the naming conventions (see above), it is
made unique by the addition of a serial number appended with a leading underline character (e.g.
"Rightturnsig_1").
If the project is under source control in an ENI data base, it may be (depends on the settings in the
Project options dialog for 'Project source control') that you will be automatically asked in which data
base category you want to handle the new object. In this case the dialog 'Properties' will open where
you can assign the object to one of the data base object categories.
'Project' 'Object Rename'
Shortcut:
With this command you give a new name to the currently-selected object or folder. Remember that the
name of the object may not have already been used.
If the editing window of the object is open, then its title is changed automatically when the name is
changed.
Dialog box for renaming a POU
'Project' 'Object Convert'
This command can only be used with POUs. You can convert POUs from the languages SFC, ST,
FBD, LD, and IL into one of the three languages IL, FBD, and LD.
For this the project must be compiled. Choose the language into which you want to convert and give
the POU a new name. Remember that the name of the POU may not have already been used. Then
press OK, and the new POU is added to your POU list.
The type of processing that occurs during conversion corresponds to that which applies to
compilation.
CoDeSys V2.3 4-43