MC_Home

This function block commands the axis to perform the homing sequence. The homing sequence is added via the homing TCOM object. The calculated offset is stored in 'Active Homing Offset'. Offsets from MC_SetPosition are discarded.

Syntax

Definition:

FUNCTION_BLOCK MC_Home
VAR_IN_OUT
    Axis           : Reference To  AXIS_REF;
END_VAR
VAR_INPUT
    Execute        : BOOL;
    Position       : LREAL;
END_VAR
VAR_OUTPUT
    Done           : BOOL;
    Busy           : BOOL;
    Active         : BOOL;
    CommandAborted : BOOL;
    Error          : BOOL;
    ErrorId        : UDINT;
END_VAR

Inputs

Name	Type	Default	Description
Execute	BOOL		Trigger the command with rising edge.
Position	LREAL	#Default	Absolute position at the reference signal ([PosUnit])

In/Outputs

Name	Type	Description
Axis	Reference To AXIS_REF	Reference to the axis

Outputs

Name	Type	Description
Done	BOOL	'Search home' sequence succeeded
Busy	BOOL	Function block is not finished and new output values are to be expected.
Active	BOOL	Function block has active control on the axis.
CommandAborted	BOOL	Command is aborted by another command.
Error	BOOL	Error occurred within function block.
ErrorId	UDINT	Error identifier

Effects on the axis state

Notes on the migration from NC2 to MC3

In MC3, the MC_Home function block has fewer inputs than in NC2. The bCalibrationCam input, familiar from NC2, is now included as the input variable Signal in the homing object and can be linked directly there.

Homing module documentation

Version information

TwinCAT Standard >= v3.1.4026.23.1
TF5500 MC3 Base >= v4.0.6