https://forge.codesys.com/forge/talk/Runtime/thread/fd21d2b694/2020-02-27T17:12:28.932000ZRecent posts to EtherCAT communication problem2020-02-27T17:12:28.932000Z2020-02-27T17:12:28.932000Zjosepmariaramshttps://forge.codesys.com/u/josepmariarams/https://forge.codesys.com54cc3af30df65cd9210ce85a585a8018b1fcea76

<div class="markdown_content"><p>The raspberry codesys is named soft real time. Codesys people ensures a jitter of about 500 us.</p> <p>Using a realtime linux image the codesys has to plug his interrupt as realtime interrupt, an I dont know if it do that.</p> <p>I have implemented a pou with a variable delay of 600us in the first task, before ethercat task. I have had running it for a 10 min and the jitter after this pou is around 5 us. But nobody ensures me that there could be a linux thread which blocks interrupts, smi or something similar.</p></div>

2020-02-27T17:12:27.833000Z2020-02-27T17:12:27.833000Zivp90https://forge.codesys.com/u/ivp90/https://forge.codesys.com92063f415490fca9fdff0483c026ae1494f9b9cf

<div class="markdown_content"><p>Without purchasing a license (just download) the CODESYS Control for Raspberry Pi runs for two hours without functional limitations and shuts down automatically (demo).</p> <p>maybe you have a problem with your license</p></div>

2020-02-27T17:12:25.047000Z2020-02-27T17:12:25.047000ZLukaszBienhttps://forge.codesys.com/u/lukaszbien/https://forge.codesys.com1e8dedd0494ab34c09d1da50f245cf33510d3adb

<div class="markdown_content"><p>Hi, <br/> I have an experience with Raspberry Pi and 3 Control Techniques drives connected by EtherCat. I had no problem with that setup. I used EMLID Real time image for Raspi. It is worth to try that image in my opinion.<br/> good luck.</p></div>

2020-02-27T17:12:24.067000Z2020-02-27T17:12:24.067000Zrgehttps://forge.codesys.com/u/rge/https://forge.codesys.com523261d645a8eafda6157e467e17e7f86670b6a0

<div class="markdown_content"><p>Hello,</p> <p>I work for an automation company.<br/> I'm developing a simple project with CoDeSys on Raspberry to control a servo-drive through EtherCAT.<br/> The code works well, but occasionally (about every 2-3 hours), the drive stops due to a communication error.<br/> I suspect that the error is due to a too high jitter that sometimes reaches peaks of 4 ms.<br/> I think that the rise of jitter is due to some process of the operating system.<br/> To solve the problem I tried to install the patch RT-Preempt, but I did not get any result.<br/> I'm using a Raspberry Pi 2 model B, I set the EtherCAT task to 4ms with a 0<br/> priority and DC (distributed clock) also to 4ms.<br/> The drive is an OMRON R88D_KN04H_ECT.</p> <p>Any suggestions?</p> <p>Thank you</p></div>