PTOHome Function Block

Function Description

This function block commands a move to the reference position. It requires the Origin input to be configured and wired, otherwise the function block sets the Error output.

As soon as the axis has reached the home position, the output Done is set to TRUE.

Homing is carried out using one of the following methods:

oShort Cam

oLong Cam Positive

oLong Cam Negative

oShort Cam with Positive Limit

oShort Cam with Negative Limit

oShort Cam with Marker(Z)

Graphical Representation

IL and ST Representation

To see the general representation in IL or ST language, refer to the chapter Function and Function Block Representation.

I/O Variables Description

The following table describes the input variables:

Inputs	Type	Comment
PTO_REF_IN	PTO_REF	Reference to the PTO channel. To be connected to the PTO_REF of the PTOSimple or the PTO_REF_OUT of the Administrative or Motion output pins function blocks.
Execute	BOOL	On rising edge, starts the function block execution. When FALSE, resets the outputs of the function block when its execution terminates.
HighVelocity	DWORD	Value of the maximum initial Homing search velocity in Hz. Range: 1 Hz...100 kHz LowVelocity ≤ HighVelocity ≤ Maximum frequency of the output
LowVelocity	DWORD	Value of the maximum final Homing approach velocity in Hz. Range: 1 Hz...100 kHz LowVelocity ≤ HighVelocity
HomingType	PTO_HOMING_TYPE	Defines the homing type.
Direction	PTO_DIRECTION	Direction of the move.

The following table describes the output variables:

Outputs	Type	Comment
PTO_REF_OUT	PTO_REF	Reference to the PTO channel. To be connected with the PTO_REF_IN input pin of the Administrative and Motion function blocks.
Done	BOOL	TRUE = indicates that the command is finished. Function block execution is finished.
Busy	BOOL	TRUE = indicates that the command is in progress.
CommandAborted	BOOL	TRUE = indicates that the command was aborted due to another move command. Function block execution is finished.
Error	BOOL	TRUE = indicates that an error was detected. Function block execution is finished.
ErrID	PTOPWM_ERR_TYPE	When Error is TRUE: type of the detected error.

NOTE: For more information about Done, Busy, CommandAborted and Execution pins, refer to General Information on Function Block Management.