XFC_TimeToPosition

XFC_TimeToPosition 1:

The function block XFC_TimeToPosition calculates the time period within which an axis will reach a position, or the time that has elapsed since the axis passed this position.

The function block extrapolates the time in relation to the current position and dynamics. Precise extrapolation is only possible over a short interval, since the axis dynamics may change.

It needs exactly one call to provide the result. It can therefore be used similar to a function, although as well as the time it may also return an error. This error must be analyzed in order to ensure that the calculated time duration is valid.

Inputs

VAR_INPUT
    Position    : LREAL;
    Options     : ST_NcTimeConversionOptions;
END_VAR

Name	Type	Description
Position	LREAL	Absolute axis position
Options	ST_NcTimeConversionOptions	Data structure with options for position extrapolation.

/ Inputs/Outputs

VAR_IN_OUT
    Axis     : AXIS_REF;
END_VAR

Name	Type	Description
Axis	AXIS_REF	The axis data structure of type AXIS_REF addresses an axis unambiguously within the system. Among other parameters, it contains the current axis status, including position, velocity or error state.

Outputs

VAR_OUTPUT
    Duration       : DINT; 
    TimeOfPosition : T_DCTIME32; 
    Error          : BOOL;
    ErrorID        : UDINT; 
END_VAR

Name	Type	Description
Duration	DINT	Time duration in nanoseconds after which the position will be reached (> 0) or since the position was passed (< 0). Duration is a differential value from two variables of the type T_DCTIME32 Distributed Clock System Time.
TimeOfPosition	T_DCTIME32	Distributed clock system time at which the position will be reached or was reached. DcTime contains the lower 32 bits of the complete DcTime and covers a time range of +/- 2 seconds around the current time.
Error	BOOL	Becomes TRUE if an error occurs.
ErrorID	UDINT	If the error output is set, this parameter supplies the error number.