Dynamic report having to update each round in PWM

Hi all

I am a newbie of LabVIEW working on the generation of PWM signal. I have to generate a PWM signal such as its ratio of obligation and indeed it should change the pulse width in each cycle based on the values stored in an excel sheet. I downloaded an example of or and try to change it, but not with much success. I use NI PCI-6132 and BNC-2110 in my configuration.

I read some examples on the generation PWM based on the dynamic ratio by manual control using 1.2 but counters have not found something that updates the report obligation to each cycle.

For an example, I enclose you a csv file containing 4 values and ratio to the vi. My goal is to generate 4 pulses with the ratio of stored in the csv file, then stop execution of the program. For starters I keep the frequency 1 Hz. I know that the vi is not correct and I'm working on it, but I thought getting some suggestions at the same time.

Thank you very much for your help.

6132 counters cannot do what you ask.  Using this material, you must generate the appropriate digital output table based on desired time and use a digital output buffer task:

STC3 based on recent hardware components (e.g. PCIe-6320) is able to output meter in the buffer:

There are some drawbacks to the use of the method of digital output which can or may not be a problem for your application:

1 it requires a much larger buffer (1 byte per example compared to 8 bytes per period).  If you need high temporal resolution and are in need of a long sequence of pulse output you may not be able to write the entire buffer at a time.

2. more data needs to be listened to on the bus (also 1 byte for example compared to 8 bytes per period).  Could be a problem if you are running at the same time as other streaming applications.

3. less time resolution (10 MHz output frequency max on the 6132 compared to 100 MHz output meter timebase on a series of X).

Best regards

Tags: NI Software

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