XFC_EL2262_MultiEdge

The function block XFC_EL2262_Multiedge handles the output of a digital cam with the EL2262 XFC oversampling terminal.

The maximum frequency depends on the cycle time. The minimum distance between two rising signal edges = (2*PLC cycle time) / oversampling factor. The minimum distance between a rising and falling edge = PLC cycle time / oversampling factor. The switching accuracy is determined by the set oversampling factor of the terminal.

Inputs

VAR_INPUT
    Reset                      : BOOL;
    Preset                     : BOOL;
    OversamplingFactor         : UINT;
    OutputOneCycleDelayed      : BOOL; (* TRUE if EL2262 is updated with the NC SAF task at the beginning of the next cycle *)
    ForceWhenLate              : BOOL; (* forces the output even when the timestamp is missed *)
    Channel                    : INT;  (* select 0 or 1 for Output0 or Output1 *)
END_VAR

Name	Type	Description
Reset	BOOL	The terminal output is deactivated.
Preset	BOOL	The terminal output is activated.
OversamplingFactor	UINT	Oversampling factor for the EL2262 terminal
OutputOneCycleDelayed	BOOL	OutputOneCycleDelayed is TRUE, if the output of the process image is delayed by a cycle due to the set timing. OutputOneCycleDelayed depends on the timing of the output task to which the EL2262 is linked.
ForceWhenLate	BOOL	If the time information changes slightly from cycle to cycle, it might not be possible for a switching edge to be output. In such a situation ForceWhenLate forces the best possible switching. In this case the PrecisionReduced output goes TRUE and can be used for diagnosis. (Can be used in the case of increased jitter in an axis position where the output of a switching edge cannot be determined to an exact output cycle).
Channel	INT	Defines the output channel of the EL2262, where 0 = Output0 and 1 = Output1.

/ Inputs/outputs

VAR_IN_OUT
    Output       : OUTPUT_REF_MULTIEDGE;
    TrackOptions : TRACK_REF;
    EL2262       : EL2262_IoInterface;
END_VAR

Name	Type	Description
Output	OUTPUT_REF_MULTIEDGE	The data structure Output contains an array of calculated states of the digital output and the associated timestamp for output on a digital XFC output terminal
TrackOptions	TRACK_REF	The data structure TrackOptions contains the parameterization for the cam track.
EL2262	EL2262_IoInterface	Process image of the terminal

Outputs

VAR_OUTPUT
    Error             : BOOL;
    ErrorID           : UDINT;
    ErrorOutputMissed : BOOL;
    PrecisionReduced  : BOOL;
    Diagnostics       : ST_EL2262_Diagnostics;
END_VAR

Name	Type	Description
Error	BOOL	Becomes TRUE if an error occurs.
ErrorID	UDINT	If an error output is set, this parameter supplies an error number
ErrorOutputMissed	BOOL	One of the switching points transferred in the Output structure could not be maintained and the output state remains unchanged. If ForceWhenLate is TRUE, the initial state is always output and ErrorOutputMissed does not become TRUE.
PrecisionReduced	BOOL	One of the switching points transferred in the Output structure could not be maintained, but the output state was output with a delay. PrecisionReduced should be regarded as a warning. It can only become TRUE if ForceWhenLate is TRUE.
Diagnostics	ST_EL2262_Diagnostics	Data structure containing diagnostic data that can be used for error analysis.