"Event structure" can't work in "While Loop"

[altenbach]

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@chen3477 wrote:

I add a waiting time because I found it couldn't produce array one-by-one. Now it can create in a sequence like 0.001, 0.002 and without a time delay it can't work at the regular interval of 0.001. I don't know why.

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Timing is separate from data. your statement makes no sense at all. Without timing, it happens so fat that all you see is the final result.

[chen3477]

My desire is to create a 1000-dimension array. The first 700 elements add from 0 up to 1 and the later 300 decrease from 1 to 0.

[Gregory]

http://zone.ni.com/reference/en-XX/help/371361R-01/lvanls/ramp_pattern/

[chen3477]

Yeah I do find the ramp pattern. I need to output the analog voltage signal via DAQ but I don't know how to connect the ramp pattern with the DAQ.

[cbutcher]

Simple example with on-demand timing (you probably don't want this, but it at least points you in a direction for:

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@chen3477 wrote:

I need to output the analog voltage signal via DAQ but I don't know how to connect the ramp pattern with the DAQ.

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Is that basically what you want?

[chen3477]

Exactly! Thanks! But I wonder how can I control the frequency since there is not a time loop structure? And I found some data was missing or delayed.

[Ben]

Put a while loop around the For loop in cbuther's code and do NOT use the continuous run button.

Ben

[altenbach]

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@chen3477 wrote:

Exactly! Thanks! But I wonder how can I control the frequency since there is not a time loop structure? And I found some data was missing or delayed.

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Because after each segment, you are configuring the IO from scratch, which takes time of course. Can't you give it the entire array of N samples and use continuous hardware-timed output? If course, as Ben already said, only the inner daq part should be repeated, not the entire code. Look at the shipping examples.

[BertMcMahan]

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@altenbach wrote:

A RT target does not have a UI, so an event structure is useless.

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Bit of a sidetrack here, but couldn't you use the event structure for User Events and DAQmx Events on a RT system? (I never do any RT programming, but I assumed those use cases would work in RT)

[Ben]

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@BertMcMahan wrote:

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@altenbach wrote:

A RT target does not have a UI, so an event structure is useless.

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Bit of a sidetrack here, but couldn't you use the event structure for User Events and DAQmx Events on a RT system? (I never do any RT programming, but I assumed those use cases would work in RT)

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You are correct.

Spoiler

So for anyone keeping score that brings Christian up 2 when we recall he once posted "1 can not be represented in binary."

Ben