MCFB_StepAbsolutes

Description

This function block performs a static homing function by setting Actual Position to the position of an absolute encoder. No physical motion is performed in this mode. Equivalent to MC_SetPosition is performed with SetPosition coming from absolute encoder reading, but with the option of using the once per rev feedback value.

 

The following figure shows the function block I/O:

Figure 8-241: MCFB StepAbsolute

Arguments

Input

En	Description	Enables execution (FFLD only )
	Data type	BOOL
	Range	—
	Unit	N/A
	Default	—
Execute	Description	Request the homing step procedure at rising edgeA rising edge is the transition of a digital signal from low to high. It is also called positive edge
	Data type	BOOL
	Range	[0 , 1]
	Unit	N/A
	Default	—
AxisID	Description	Name of a declared instance of the AXIS_REF library function
	Data type	AXIS_REF
	Range	[1 , 256]
	Unit	N/A
	Default	—
Mode	Description	Define the actual position assignment source Value Description 0 use drive feedback position for actual position 1 use once per rev feedback position
	Data type	BOOL
	Range	[0 , 1]
	Unit	N/A
	Default	—

Output

Done	Description	Indicates the move completed successfully. The Command Position has reached the endpoint
	Data type	BOOL
	Unit	N/A
Busy	Description	High from the moment the Execute input is one-shot to the time the move is ended
	Data type	BOOL
	Unit	N/A
Active	Description	Indicates this move is the active move
	Data type	BOOL
	Unit	N/A
CommandAborted	Description	Indicates the move was aborted
	Data type	BOOL
	Unit	N/A
Error	Description	Indicates an invalid input was specified or the move was terminated due to an error
	Data type	BOOL
	Unit	N/A
Error	Description	Indicates an invalid input was specified or the move was terminated due to an error
	Data type	BOOL
	Unit	N/A
ErrorID	Description	Indicates the error if Error output is set to TRUE Value Description 1 Desired SetPosition is outside of Rollover period
	Data type	INT
	Unit	N/A

Related Functions

MCFB_StepAbsSwitch

MCFB_StepRefPulse

MCFB_StepBlock

MCFB_StepLimitSwitch

Example

Structured Text

//Write current once per rev feedback position to overall axis position
MCFB_StepAbsolute( ExecuteHome, Axis1, ModeHome );

Ladder Diagram

Function Block Diagram

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