OBIOPwm (FB)

FUNCTION_BLOCK OBIOPwm EXTENDS AbbLConCA

Access the PWM functionality for AC500 eco CPU.

precondition

the respective channel is configured as PWM channel.

Up to 8 PWM channel are possible. The max possible frequency is determined by hardware delay times.

Maximum possible frequency for channel 0..3 is 5kHz.

Maximum possible frequency for channel 4..7 is 100 kHz. Recommended is to use <50kHz, or combine the OnTime/Offtime calculation with a feedback like closed-loop control.

|the max allowed time for OnTime or OffTime is 10sec = 10*1000*1000 microseconds

• The block accepts OnTime and OffTime in microseconds. The accuracy will be 2.5 us. Pulses will not be shorter, but can be 2.5 us longer.

• The block counts the issued pulses. (rising edges are counted)

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, 0,1,2,3,4,5,6,7
	OnTime	UDINT		time in microseconds to switch the binary output on
	OffTime	UDINT		time in microseconds to switch the binary output off
Output	ErrorID	Error_ID	0	Error code
	Counter	UDINT		number of pulses which were already issued, 32bit value counting modulo 2EXP32