[etherlab-users] EtherCAT Master via USB-Adapter?

Dr.-Ing. Wilhelm Hagemeister hm at igh.de
Tue Apr 30 10:00:55 CEST 2019


Hallo Mr Zeilhofer,

with a good tuned system and native driver one can realize sample rates
up to several kHz with jitter at some micro seconds. As far as I know
USB gets polled by the kernel. I would expect it can be used in a sample
rate range up to 100 Hz but we have no experience jet. May you can
discover and post your results here?

Regards Wilhelm.

Am 30.04.2019 um 09:49 schrieb Karl Zeilhofer:
> Dear Mr. Wilhelm,
> 
> thanks for your first advices. May I ask, what do you define as "good"
> realtime behavior?
> 
> Could this "bad" realtime performanc be improved by using a USB-adapter
> with a supported chipset? Or does USB (3.0) introduce inherently bad
> realtime performance?
> 
> Kind regards, Karl Zeilhofer
> 
> 
> On 30.04.19 07:47, Dr.-Ing. Wilhelm Hagemeister wrote:
>> Hallo Mr Zeilhofer,
>>
>> generally the EtherCAT master should work with any Ethernet interface
>> which is supported by the kernel if one uses the generic driver.
>>
>> Due to the fact that the generic driver uses parts of the regular
>> network stack, don't expect good realtime behavior with an USB connected
>> adapter.
>>
>> Regards Wilhelm
>>
>> Am 30.04.2019 um 01:40 schrieb Karl Zeilhofer:
>>> Hi,
>>>
>>> has anyone experiences with running the IgH EtherCAT master via a
>>> USB-Ethernet adapter?
>>> I'm using one on one of my servers, which runs since years without
>>> problems. It uses the r8152 Ethernet driver, which is not supported.
>>>
>>> For the first tests, I don't want to configure my main Ethernet port,
>>> which is an e1000e, on my daily working machine.
>>> As far as I understood from the documentation, that Ethernet port cannot
>>> be used for the daily network traffic any more, right?
>>>
>>> If it would generally work over USB, I would buy a new adapter with one
>>> of the supported chip sets. Any recommendations?
>>>
>>
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