OBIOFreqOut (FB)

FUNCTION_BLOCK OBIOFreqOut EXTENDS AbbLConCA

Access the PWM functionality for AC500 eco CPU and issue an adjustable frequency

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

• The block accepts Frequency in Hz. The frequency will be measured and adjusted, so that the average value meets the correct frequency, but single pulses can be longer or shorter.

• 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
	Frequency	LREAL		[Hz] 0,05Hz..100kHz to switch the binary output on/off
Output	ErrorID	Error_ID	0	Error code
	Counter	UDINT		number of pulses which were already issued, 32bit value counting modulo 2EXP32