EtherCat Sync & DC problem

Automata27 wrote:

as per your suggestion following settings i have changed...

refClockSyncCycles = "* 1" and sync0Cycle = "configured cycle time"
sync0Cycle = "1000000"
sync0Shift = "0"

attached is the waveform that i got now...still dc issue is there...

i am configured drive DC synch mode...
cycle time that i use is 1ms....

as per your suggestion if i set sycn0shift = "half cycle " then also same issue...no change...

hello Automata,
I'm sorry I could not help you.
regards
Chimeno

Automata27 we also have some DC syncs problem.

I copy you some links:

lists.etherlab.org/pipermail/etherlab-users/2018/003281.html
github.com/sittner/linuxcnc-ethercat/issues/45

Sascha is improving the sync function and he is trying to achieve the B method described by Graeme Foot here
lists.etherlab.org/pipermail/etherlab-users/2016/003013.html

You could try to install rt-preemt and try the fix-dc-sync version that sascha has programmed. The desync problems in ciclyc position mode continues for me using it but you could try it. More feedback could help him.

I think the origin of the problem is the time between sent packets. If you try to use wireshark like I described in github issue you could investigate it deeply.

BR
Nacho Rosales

Hi Nacho Rosales ,

thanks for reply....
i am going to try with rt-preepmt and fix-dc-sync version soon...will let you know the result soon...

Regards,

Hi Automata27,

I also encountered the same problem, have you solved it?

Hi pamxy,

Yes my problem is solved, i have used debian stretch preemt rt, with dpll patch on lcnc, pll patch file is attached here for your reference.
also attached here is .xml file which worked for me

Regards,

can Someone make a Quick Step by step tutorial on How to add this patch and make the ethercat work
Please

pl7i92 wrote:

can Someone make a Quick Step by step tutorial on How to add this patch and make the ethercat work
Please

hi pl7i92,
I'm also interested in this topic, but I'm not sure it works, download the file and in the terminal use the command "patch < add-task-pll-functions.patch"
regards
Chimeno

Refer the below forum message has steps of ethercat install notes build from git source.

forum.linuxcnc.org/27-driver-boards/3559...ow-to-install#121471