MLFB_HomeFindLimitFastInput

Pipe Network motion icon

Function Block - Fast homing to a limit switch.

Inputs

Input	Data Type	Range	Unit	Default	Description
ibExecute	BOOL	0, 1	N/A	No default	Request the homing step procedure at the rising edge.
iAxisID	AXIS_REF	1 to 256	N/A	No default	Name of a declared instance of the AXIS_REF library function. See AXIS_REF Structure.
iPosition	LREAL	No range	User units	No default	Offset position applied after home switch is found.
ibDirection	BOOL	0, 1	N/A	No default	Defines the axis homing direction. 0 (zero) = Clockwise rotation. 1 = Counterclockwise rotation.
iVelocity	LREAL	No range	User unit/sec	No default	Commanded velocity for the homing move.
iAcceleration	LREAL	No range	User unit/sec²	No default	Commanded acceleration for the homing move.
iDeceleration	LREAL	No range	User unit/sec²	No default	Commanded deceleration for the homing move.
ibLimitSwitchMode	BOOL	0, 1	N/A	No default	Limit switch state to complete homing. 0 (zero) = Rising edge of switch. 1 = Falling edge of switch.
ibFastInputNumber	BOOL	0, 1	N/A	No default	Limit switch state to complete homing. 0 (zero) = Fast Input Number 1. 1 = Fast Input Number 2.
iCycleTime	LREAL	No range	Microseconds	No default	EtherCAT cycle time. Either 250, 500, or 1000.

Outputs

Output

Data Type

Range

Unit

Description

obDone

BOOL

FALSE, TRUE

N/A

Indicates the move completed successfully.
The Command Position has reached the endpoint.

obActive

BOOL

FALSE, TRUE

N/A

Indicates this move is the Active move.

obError

BOOL

FALSE, TRUE

N/A

Indicates either:

An invalid input was specified.
The move was terminated due to an error.

oErrorID

DINT

N/A

Indicates the error if the Error output is set to TRUE.

Error identifier:

ErrorID	Description
1	Axis in error.
2	Axis is not enabled.
3	Timeout exceeded or expired.
4	SDO read/write error.
5	Input parameter out of range.

Remarks

Performs a single-axis home to a limit switch connected to a High Speed Input.
The motor starts to move according to the direction setting.
- The home position has been found as soon as the fast input selected is triggered on the edge selected.
An absolute move is made to the triggered position and the position value is set.

This image shows the function or function block I/O.

Figure 1: MLFB_HomeFindLimitFastInput

Usage

This procedure performs a homing function searching for a sensor using only High Speed Input Switches.
- A High Speed Limit Switch has 1 Off (or On) area.
Home is commanded by the user in the designated homing direction at the selected or programmed Velocity.
The Timeout can cause an error if exceeded.

Figure 2: MLFB_HomeFindLimitFastInput Usage 1

Figure 3: MLFB_HomeFindLimitFastInput Usage 2

FBD Language Example

FFLD Language Example

IL Language Example

Not available.

ST Language Example

Direction:= 0;
Position:=1000;
Velocity:=1000;
Acceleration:=10000;
Deceleration:=10000;
SwitchMode:=0;
Timeout:=T#100;
FastInputNumber:=0;
CycleTime:=1000;

inst_fbHomeFindLimitFastInput(True, Axis1, Position, Direction, Velocity, Acceleration, Deceleration, LimitSwitchMode, Timeout, FastInputNumber, CycleTime);

HomeComplete :=inst_fbHomeFindLimitFastInput.Done;
HomeActive :=inst_fbHomeFindLimitFastInput.Active;
HomeError :=inst_fbHomeFindLimitFastInput.Error;
HomeErrorID :=inst_fbHomeFindLimitFastInput.ErrorID;