XFC_TimeOfPosition

XFC_TimeOfPosition calculates the time at which the axis will be or was at a specified position.

The function 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.

The function block requires precisely one call in order 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 DcTime is valid.

Inputs

VAR_INPUT
    Position : LREAL;
    Options  : ST_NcTimeConversionOptions;
END_VAR

Position	Absolute axis position
Options	Data structure with options for position extrapolation.
Options.	SubIndex	For axes with more than one encoder the index (0..9) of the encoder to which the position refers can be specified in SubIndex.
Options.	InterpolationOptions	0: The position extrapolation is carried out with the current velocity, without taking into account the current acceleration. 1: The axis acceleration is included in the position extrapolation.
Options.	CompensationTime	additional compensation time

Outputs

VAR_OUTPUT
    DcTime  : T_DCTIME32; 
    Error   : BOOL;
    ErrorID : UDINT;
END_VAR

DcTime	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	Becomes TRUE if an error occurs.
ErrorID	If the error output is set, this parameter supplies the error number

Inputs/outputs

VAR_IN_OUT
    Axis     : AXIS_REF;
END_VAR

Axis

Axis data structure

The axis data structure of type AXIS_REF addresses an axis uniquely within the system. Among other parameters it contains the current axis status, including position, velocity or error status.