Position Synchronized Output

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27 Aug 2021 08:03 #218872 by wang
hi

Does anyone know the PSO function? Is Position Synchronized Output

I use three servo drives to operate laser cutting through EtherCAT and a laser. I want to realize the PSO function. Has anyone done it? Or does anyone have good suggestions?

Attach an explanation page of the PSO function:
www.aerotech.com/a3200-product-feature-h...hronized-output-pso/

In fact, it is how to quickly obtain the position of the XY axis and output a pulse at equal intervals. An example of two light spots is about 30 microns.


Hope everyone can give me some help
Thank you very much

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27 Aug 2021 12:39 #218904 by dm17ry
Replied by dm17ry on topic Position Synchronized Output
maybe the stepgen component can be used for that? sample axis.[xy].pos-cmd summing the distance in each servo cycle: dist+=sqrt(dx^2+dy^2). feed dist to the stepgen configured for 30um per step and it should output those pulses... check the base-thread frequency vs your feed rate though..
The following user(s) said Thank You: wang

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27 Aug 2021 14:10 #218907 by PCW
Replied by PCW on topic Position Synchronized Output
It looks like the drive has the stepgen like hardware that outputs the video stream
I guess the issue is how you get the video data stream to the drive via linuxCNC
(and any position breakpoints needed)

I am interested in a clean way to do this as its almost the same hardware wise
as Mesa's DataPainter firmware module (that is basically a position locked loop
that clocks a FIFO of on/off or PWM video data)
The following user(s) said Thank You: wang

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31 Aug 2021 02:03 #219210 by wang
Replied by wang on topic Position Synchronized Output

maybe the stepgen component can be used for that? sample axis.[xy].pos-cmd summing the distance in each servo cycle: dist+=sqrt(dx^2+dy^2). feed dist to the stepgen configured for 30um per step and it should output those pulses... check the base-thread frequency vs your feed rate though..

Hello, thanks for your reply

I still have questions to consult you, where should I do this calculation after obtaining the axis position? hal file? I don’t know that calculations can be done in the hal file. Can you give me an example for my needs?

Most sincere thanks

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31 Aug 2021 06:56 #219223 by Aciera
Replied by Aciera on topic Position Synchronized Output
You might want to look at writing a custom component:

www.forum.linuxcnc.org/24-hal-components...te-new-hal-component

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31 Aug 2021 07:08 #219224 by wang
Replied by wang on topic Position Synchronized Output
Oh, yes, thank you. If I can't do it in other ways, I will try it, thank you

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31 Aug 2021 08:48 #219230 by Aciera
Replied by Aciera on topic Position Synchronized Output
Here is another link for documentation:

linuxcnc.org/docs/2.8/html/hal/comp.html

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