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Thank you for the answers.

This keeps things easier, "problems solved" so far. Next up is to hook up the spindle drive.

Greetings Timo

Nice. I could not find where you have told us what spindle you are using. Please share.

You can drive the VFD directly with RS485 via a USB to RS485 adapter without bothering with Ethercat. Worked perfectly for me.
I think if you wanted to use Ethercat to drive a VFD, you would use a Ethercat compatible VFD.
There is a Omron MX2 driver included. but I have never used it.
 

Machine partially rebuilt.
Did wind up finding that one of the linear blocks was damaged. order some new ones. I lapped and realigned everything, so things should be more precise now too - better than 0.001" over the whole work area pre compensation. Hopefully by next weekend its all running again with the new spindle and vacuum. woo. 

 

I am in the middle of building an EtherCAT system using a Beckhoff EK1100 and would like to use the el6021 module to drive my spindle VFD with RS485.
I've searched the forum and seen it mentioned briefly a couple times but I can't find where anyone has got a driver working for it?
How hard would that be to accomplish?