New update on STMBL

You can contact me via the github page if you like me to guide you on the ethercat thing.
You find a working Kicad schematics in the github files. Hardware interface is SPI (4 wires),
3 interrupt lines and perhaps one reset line. In software you need to respond on interrupts
every 1 ms (typically) by reading pdo data, do the things you need to do, and write pdo data
takes about 100 usecs or therearound. A cia402 implementation is a bit more with the state
machine, it's all in software though.

 

Don't think so regarding the worms. It uses the Simple Open Source Ethercat Slave code
github.com/OpenEtherCATsociety/SOES
There are no licensed tools used, all open source.
And I guess it is enough that it works as an ethercat slave, you don't need to certify it.
And one thing doesn't need to exclude the other. Just saying that it can be done if one chose to.

If you just make it for yourself, I dont think there is an issue. The moment you sell something ethercat related you made, you have to certify it (very sinplified and there are exeptions). As long as you are considered as an end user, you should be good.

I have to say, an open source cia402 drive would be really cool.

I build 5 stmbls last Year. Something around 250,- Euro each. So not really cheap. I uesed original phoenix contact plugs for example.

Julian

Yes. Unfortunetly you can not compare the prices the last years. Also the stms were really expensive... But I am happy so far. I have 24 IRAMs in total in my stock. So I will try to build the old design in the future.

Julian

More useful than ethercat is 600vdc because opens the door
to more powerful from 2kw range servos like spindle servos and big cnc servos.
Except other igbt module to handle 600vdc better isolation better connectors
what other needs?
The modifications will be in power stage.. driving stage needs modification?
To all stmbl owners are you happy from stmbl ? Works like commercial servos?

andypugh wrote:

I feel that making this as an EtherCAT slave might open something of a licensing can of worms. But it already has Ethernet port for command input, and I would expect the STM32 to have the CPU horesepower to handle the protocol.
 

I don't think this will be a problem because the ethercat license is paid for in the price of the lan9252 chip.
If you were to manufacture these for commercial sale, you would need to be a company and register for free membership of the ETG to be compliant.
Its only linuxcnc who has a lcensing issue because we do not have any legal business structure.