OBIOPulseTrainOutput (FB)

FUNCTION_BLOCK OBIOPulseTrainOutput EXTENDS OBIOBaseCounter

Access the pulsetrain output functionality for AC500 eco CPU.

The PTO supports clockwise/counterclockwise or pulse/direction outputs with a maximum frequency of 200kHz.

precondition

the respective channel is configured as PTO channel.

2 binary outputs are used for 1 PTO channel, up to 2 PTO channels are possible.

Note

This block should just be called once per cycle otherwise inconsistent values could be send to PRU, if send twice in short time.

InOut:

Scope	Name	Type	Initial	Comment	Inherited from
Input	Enable	BOOL	FALSE	A rising edge (Enable = TRUE) starts the operation, the output Busy goes to TRUE. All other inputs are read and considered continuously. A falling edge (Enable = FALSE) aborts the operation. During Aborting the Busy is still TRUE. Afterward all outputs are reset.	AbbLConCA
Output	Busy	BOOL	FALSE	Operation is running (while output Error is FALSE)	AbbLConCA
	Error	BOOL	FALSE	Operation is stopped with error (while output Busy is FALSE). This output is TRUE for at least one cycle or until Enable is set to FALSE. The output ErrorID gives more details about the error.	AbbLConCA
Input	Channel	BYTE	0	Channel number, for encoder 0/1, for forward counter 0..3, for PulseTrainOutput 0/1	OBIOBaseCounter
	Set	BOOL		Sets counter value to CounterValueSet on rising edge	OBIOBaseCounter
	CounterValueSet	UDINT		Counter value to set	OBIOBaseCounter
	EnableLimit	BOOL		Use limits, FALSE: counts ‘endless’, TRUE: counts from 0 to LimitValueMax, starts again with 0 on overflow. A new value will be used with rising edge on Enable	OBIOBaseCounter
	LimitValueMax	UDINT	0	Upper limit, will count from 0 to < LimitValueMax-1 (with EnableLimit=TRUE), so the range for counting is LimitValueMax. The value has to be set while CounterValue < LimitValueMax. A new value will be used with rising edge on Enable	OBIOBaseCounter
Output	ErrorID	Error_ID	0	Error code	OBIOBaseCounter
	CounterValue	UDINT		Actual counter value	OBIOBaseCounter
Input	Start	BOOL		Start pulses and initialize counters on rising edge (if NumberOfPulses>0 is used)
	Halt	BOOL		Halt pulses, counter be preserved
	CwCCw	BOOL		if true, Clockwise/Counterclockwise, else Pulse/Direction mode, can be changed with Start=FALSE
	Invert	BOOL		Invert the moving and counting direction
	Direction	BOOL		direction to be used for the next movement, can be changed with Start=FALSE
	EnableFinesteps	BOOL		in case the frequency value is changed, a 100us update to reach the target frequency is enabled
	Frequency	LREAL		frequency min = (30 Hz or MaxFrequency/655) / max = 200 kHz. The input can be changed any time. With Frequency=0, the pulses will be stopped. Any value >0 will result in minimum value to be used.
	NumberOfPulses	UDINT		number of pulses, just values >=0 allowed, >0 means: issue a certain NumberOfPulses after rising edge of Start, =0 means: issue a endless number of pulses
	MaxFrequency	UDINT	200000	[Hz] max allowed value = 200kHz. Deviation with max frequency is 1%, slowest possible frequency is MaxFrequency/655, deviation for slowest frequency is 0.002%,, new value just used with Enable=FALSE
	CycleTime	LREAL	1	Cycle of plc task time in ms, just used when EnableFinesteps=TRUE, , new value just used with Enable=FALSE