Reference

This chapter contains a documentation of all classes and methods of the TwinCAT Automation Interface. The provided interfaces can be divided into different "levels" in which the higher level interfaces represent the primary interfaces and therefore the basic interaction with the Automation Interface. Please note that this differentiation comes only from a logical point-of-view, to get a better understanding about which interfaces are most important and which interfaces are of secondary importance.

Level 1 interfaces

As mentioned in our introduction, there are only two main interfaces which are being used for navigating and referencing tree items in TwinCAT configuration.

Main class	Description	Available since
ITcSysManager	Base class to create and parameterize a TwinCAT configuration	TwinCAT 2.11
ITcSmTreeItem	Represents a tree item within a TwinCAT configuration	TwinCAT 2.11

Level 2 interfaces

These interfaces are considered as "helper classes" which are always used together with level 1 classes, for example to cast an ITcSmTreeItem object into a more specific type of tree item, for example a POU (ITcPlcPou) or a linked task (ITcTaskReference).

Helper class	Description	Available since
ITcPlcLibraryManager	Defines methods and properties for PLC library management	TwinCAT 3.1
ITcPlcPou	Defines methods and properties to handle PLC POUs	TwinCAT 3.1
ITcPlcDeclaration	Defines methods to read/write the declaration area of a PLC POU	TwinCAT 3.1
ITcPlcImplementation	Defines methods to read/write the implementation area of a PLC POU	TwinCAT 3.1
ITcPlcProject	Defines methods and properties regarding a PLC project, e.g. setting the project as a boot project	TwinCAT 3.1
ITcPlcIECProject	Defines methods needed to import/export PLC projects in PLCopen XML and also install them as a PLC library	TwinCAT 3.1
ITcPlcTaskReference	Defines methods and properties to link the PLC project to a task	TwinCAT 3.1
ITcPlcLibrary	Helper class which represents a single PLC library	TwinCAT 3.1
ITcPlcLibraries	Helper class which represents a collection of PLC libraries	TwinCAT 3.1
ITCPlcReferences	Helper class which represents a collection of ITcPlcLibRef objects (and therefore references in a PLC project)	TwinCAT 3.1
ITcPlcLibRef	Helper class which represents a base class for ITcPlcLibrary and ITcPlcPlaceholderRef objects	TwinCAT 3.1
ITcPlcPlaceholderRef	Helper class which represents a single PLC placeholder	TwinCAT 3.1
ITcPlcLibRepository	Helper class which represents a single PLC library repository	TwinCAT 3.1
ITcPlcLibRepositories	Helper class which represents a collection of PLC library repositories	TwinCAT 3.1