TwinCAT 3.1 Build 4024

The following new properties and features are available with TwinCAT 3.1 Build 4024.

Category	Feature	Further information	Available from build revision
Development support	"Go to definition" command available in the PLC process image	Command Go To Definition	4024.0
	Menu command and hotkey for uncommenting or canceling an uncommenting	Command Comment Selection Command Uncomment Selection	4024.0
	Identification of unlinked allocated variables (AT%I, AT%Q)	see below	4024.10
Storage format	Optional storage format Base64	Command Properties (object)	4024.0
Compiler	Conditional compilation – in addition to the implementation editor – now also available in the declaration editor	Conditional pragmas	4024.0
Object-orientated programming	Extended monitoring of an interface variable: Symbol path and online data of the currently assigned FB instance are displayed under the interface variables in the monitoring area (declaration editor, monitoring list).	Object Interface	4024.0
	Mini-icons show access modifier: Mini-icons on the object symbols in the project tree show whether the object is private, public or protected.	Object Method	4024.0
	ABSTRACT keyword	ABSTRACT concept	4024.0
Online features	{attribute 'to_string'} for enums: This attribute is used in order to textually query the name of an enum element by means of TO_STRING/TO_WSTRING.	Attribute 'to_string'	4024.0
	Exception-Handling via __TRY/__CATCH (for 32-bit runtime systems)	__TRY, __CATCH, __FINALLY, __ENDTRY	4024.0
	Memory reserve for Online Change	Configuring the memory reserve for Online Change	4024.0
	Details button in the message window when logging-in a changed PLC project	Updating the PLC project on the PLC	4024.0
	Command "Go to instance"	Command Go to Instance	4024.0
	Error analysis with core dump	Error analysis with core dump	4024.11
Miscellaneous	Option "Generate tpy file"	Category Compile	4024.0

Identification of unlinked allocated variables (AT%I, AT%Q)

With the help of the summary described below, you can obtain an overview of the allocated variables (AT%I, AT%Q) that are not linked. As a result of this you can, for example, obtain an overview of the links or the project status.

Procedure:

1. Double-click the input or output process image of a PLC task in the Solution Explorer (e.g. double-click the object "PlcTask Inputs" or "PlcTask Outputs").

A summary opens showing the allocated inputs or outputs of this PLC process image (see below, first screenshot).

2. Click the header of the second table column (column header: "[X]").

Only those allocated inputs or outputs that are not linked are still shown (column header changes to : "[ ]" (see below, second screenshot).

3. Click the header of the second table column again.

All allocated inputs or outputs are shown again (column header changes to "[X]").

Notes:

With the help of this summary you can create new links or change existing links. To do this, right-click a variable/line and select the command Change link.
To display the sub-elements of a structured variable or an array, click the Show sub-elements button inside the TwinCAT XAE Base toolbar.

Values of the column "[X]" or "[ ]":

Column value	Meaning	*Example (see )**	Example variable in the screenshots (see below)
Empty	Not linked		IbUnlinked
X	Linked	Individual linked variable	IbLinked MAIN.aIn3[1]
		Array where the array itself is linked	MAIN.aIn1
		Array where all elements of the array are linked separately	MAIN.aIn2
P	Partially linked	Array where at least one, but not all elements of the array are linked separately	MAIN.aIn3
I	Indirectly linked (via a parent variable)	Elements of an array where the array itself is linked so that the array elements are indirectly linked as well	MAIN.aIn1[1]

* The named array examples are also transferrable to structured variables (e.g. structure instance) and their sub-elements.