https://forge.codesys.com/forge/talk/Runtime/thread/27644c2cba/2020-02-27T17:15:52.879000ZRecent posts to Max resolution timer2020-02-27T17:15:52.879000Z2020-02-27T17:15:52.879000Zmrubiochttps://forge.codesys.com/u/mrubioc/https://forge.codesys.com91ea33034d4d9dadc50e916497acf798191b42c6

<div class="markdown_content"><p>Thanks for your reply..</p> <p>I'm trying to read a encoder though a Ethercat BUS, and i was wondering what max cycle task could be achieve without stuck the pi.. If we consider that i have a PREEMPT kernel, i should be able to get it properly, as you explain...</p> <p>Regards</p> <p>Miquel</p></div>

2020-02-27T17:15:49.958000Z2020-02-27T17:15:49.958000Zeschwellingerhttps://forge.codesys.com/u/eschwellinger/https://forge.codesys.comab72aac28aa3dadb85b7cecb977c75b79e6a0021

<div class="markdown_content"><p>Hi,</p> <p>if you use a Pi2 or Pi3 even cycltimes &lt; 1ms should not be a problem, (for example 500us is possible)<br/> but I agree to Joseph you need to take care if you set this in the highest prio task the max calc time from your code should not take<br/> more than the cycle time you have specified.<br/> If you do this I would recommend to set the following settting<br/> in /etc/CODESYSControl.cfg to enable the processorload supervision.<br/> <strong><span><span>[CmpSchedule]</span></span>ProcessorLoad.Enable=1ProcessorLoad.Maximum=95ProcessorLoad.Interval=5000</strong></p> <p>BR<br/> Edwin</p></div>

2020-02-27T17:15:48.979000Z2020-02-27T17:15:48.979000Zjosepmariaramshttps://forge.codesys.com/u/josepmariarams/https://forge.codesys.com0abdc95f72d5f1e2db836cfeb4272948eeec23c0

<div class="markdown_content"><p>Ei Miquel.</p> <p>It depends on the execution time of your codesys code.</p> <p>For example. If your code takes 1 ms of execution time, you can use a timer task of 10 ms. But if your execution time is 9 ms, 10 ms could not be a good option</p> <p>As I can remember, raspberry codesys allow a minimum cycle of 10ms. Normally a cycle time between 10 and 100 ms. Could be good.</p> <p>Be carefull with visualization tasks on Raspberry. Its takes a lot of time.</p> <p>And finally, executing on an standard raspbian linux you will have a jitter which can be 0,5 ms. The people says that with a preemtive kernel it is reduced to 100 us...</p></div>

2020-02-27T17:15:46.268000Z2020-02-27T17:15:46.268000Zmrubiochttps://forge.codesys.com/u/mrubioc/https://forge.codesys.com01c17c2990d4d245e65641ae2b402d2f33934890

<div class="markdown_content"><p>Hello</p> <p>I would like to now the max resolution for a timer/task on a Pi 3, and having a good performance for others tasks..</p> <p>Thanks,</p> <p>Miquel</p></div>