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Is it possible to do any useful testing of EtherCAT hardware with a virtual machine running Linuxcnc? 

I fully understand that Linuxcnc can't run with any realtime capabilities within a virtual machine.  But can an Ethercat configuration be set up, configured and connect to a real Ethercat device for testing purposes?  I don't want to set up and run a machine this way.  I would just like to see if I can read some IO modules, maybe configure/talk a drive and send it a command for bench testing.

What all could you expect this to do?  What things would be expected to not work at all?  What might sort of work?  Can Linuxcnc communicate with a Beckhoff PLC if so to what extent?   

Hi,to my hal file: loadusr -W hal_manualtoolchangenet tool-change iocontrol.0.tool-change => hal_manualtoolchange.change
net tool-changed iocontrol.0.tool-changed <= hal_manualtoolchange.changed
net tool-number iocontrol.0.tool-prep-number => hal_manualtoolchange.number
net tool-prepare-loopback iocontrol.0.tool-prepare => iocontrol.0.tool-prepared loadusr linuxcncrsh -n --name localhost, -p , --port 5007 I added the line in bold at the end of my hal file, and there didn't appear any error when I ran the CNC manually the Axis Gui. Everything works. But when i tried to run in this command "telnet localhost 5007", through the Terminal i got this error:Trying ::1...
Connection failed: Conexión rehusada
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]' I am using parallel port 0x378 What is missing or is wrong?Thanks a lot.

Qtvcp is included with linuxcnc.
linuxcnc.org/docs/devel/html/gui/qtvcp.html
and Gladevcp
linuxcnc.org/docs/devel/html/gui/gladevcp.html

Both can be used for GUI building, Qtvcp is easier then Gladevcp I would say.