The basics of core functions (FB_CoreFunction)

All Corefunctions have a number of common features that are implemented in a ABSTRACT FB_Corefunction. A number of Corefunctions are derived from FB_CorefunctionFeedback and provide further properties and methods. Through the inheritance of FB_Corefunction, each Corefunction receives the properties and methods described here.

Core functions are instantiated within motion objects as local elements. At startup, the core function receives an interface to its host axis and, if necessary, to a drive-related adaptation.

Syntax:

FUNCTION_BLOCK ABSTRACT FB_Corefunction EXTENDS FB_MessageBase

Properties

Name	Type	Access	Description
InitState	BOOL	Get, Set	The core function is not completely and successfully initialized.
FB_Corefunction
[`INTERN`] AxisState	E_AxisState	Get, Set	The current state of the axis state machine.
[`INTERN`] Connected	BOOL	Get	The Corefunction is connected to an axis.
[`INTERN`] CycleTime	LREAL	Get, Set	The cycle time of the PLC task from which the method `Cyclic()` of the Corefunction is executed.
[`INTERN`] CycleTimeValid	BOOL	Get, Set	A TRUE indicates that the `CycleTime` of the Corefunction is defined.
FailedState	BOOL	Get, Set	If IsActivated is TRUE at the same time: Signals the failure of an accepted command. If IsActivated is FALSE at the same time: Signals the rejection of a command.
HasFeedback	BOOL	Get	The core function has responded to a pending command.
IsActivated	BOOL	Get	The core function has an accepted command pending.
IsLocalCmd	BOOL	Get	Signals that the axis is assigned with a command of this core function.
[`INTERN`] NextCore	I_Corefunction	Get, Set	This property is part of the execution chain and must not be affected by the application task.
[`INTERN`] OnlineChangeMark	BOOL	Get, Set	The axis uses this property to signal an Online Change to the Corefunction.
ReadyState	BOOL	Get, Set	The Corefunction is ready for operation, but is not commandable at this time. Possible reasons are: - The axis is not enabled. - Another Corefunction is active. - The Corefunction does not support any commands.

Methods

Name	Description
[`INTERN`] Cyclic()	This method is called cyclically by the axis.
FB_Corefunction
[`INTERN`] ApplyCommand()	Applies the command to the axis.
[`INTERN`] ClearStates()	Clears up some of the possible states.
[`INTERN`] DoReset(`bExecute`)	This method is called when the axis is reset.
[`INTERN`] RemoveCommand()	Removes the command from the axis.

Interfaces

Type	Description
I_Corefunction	Standard interface on FB_Corefunction.

Requirements

Development environment	Target platform	PLC libraries to include
TwinCAT v3.1.4024.35	PC or CX (x64, x86)	Tc3_PlasticFunctions v3.12.4.26 or higher

Further Information

Permanently active core functions