Hi,

Where can i find information related to setup of ethernet over ethercat.
Anything special to setup on Linux?

Regards

Hi,
basically you need to use a tap device to do it:

set up tap0 device

/sbin/ip tuntap add tap0 mode tap
/sbin/ip link set tap0 up
/sbin/ip addr add 192.168.2.1/24 dev tap0

maybe you need to add a route additional
echo 1 >/proc/sys/net/ipv4/ip_forward' ...

Hi Edwin,

Herewith a solution that works to enable the EoE on debian linux.

Step 1
Edit the network settings
nano /etc/network/interfaces

add the following:

auto tap0
iface tap0 inet manual

pre-up ip tuntap add tap0 mode tap user root  # or use a different user profile. 
up ip link set dev tap0 up
post-up /usr/local/sbin/enablebr0.sh  # script to enable the br0 bridge
post-down ip link set dev tap0 down
down ip link set dev tap0 down

Save the file then

Make the enablebr0.sh script

nano /usr/local/sbin/enablebr0.sh
Contents of script---- Where enp1s0 put your network adaptor name / where the 192.168.0.99/16 put your desired ip address.

add the following:

ip link add br0 type bridge
ip link set tap0 master br0
ip link set enp1s0 master br0
ip link set dev br0 up
ip addr add 192.168.0.99/16 dev br0

Save the script. Remember to make it executable (chmod +x /usr/local/sbin/enablebr0.sh)

Hope this helps someone.

many thanks for this.

Hi,

Got lost on this explanation on which IP and adapter goes where.

In my setting the:
- EoE device has the IP 192.168.10.10 -> this is what I put into the enablebr0.sh (192.168.10.10/24)
- EtherCat runs on eth0 -> this is the adapter for enp1s0?
- eth0 has a IP configured to be 192.168.10.1
- eth1 has a IP configured to be 192.168.0.50. This is where the PC is connected to the raspberry PI.
- on my PC I have a route to 192.168.10.0 MASK 255.255.255.0

With this I'm able to ping 192.168.10.1.

If I add the tun/tap (accodring to shaunvdm) I'm able to ping 192.168.10.10, but even with EtherCat not running. So I guess I've gone wrong somewhere, as I just ping the br0 bridge.

Any hints on where I'm going wrong?

Hi,

Yes you got this totally mixed up.

Your EoE address range must be the same as the programming port NOT Ethercat as this uses alias and not IP addresses.

So in short

Change the Enablebr0.sh to the programming port address ie 192.168.0.50/16. (In the Network interfaces set the eth1 to manual similar to the tap port (auto eth1 iface eth1 inet manual)
(This bridge connection replaces your normal Eth1 definition to enable a bridge between Tap and physical interface to Ethercat)

In Codesys make sure you use the EoE on the 192.168.0.XXX range for the drives or whatever you want to talk to over Ethercat with ethernet protocol.

No routing required besides the information i provided in my post.

Let me know....

That clears a lot! Thanks.

I used 192.168.0.51/24 in the enablebr0.sh.
This to have a difference between the origin eth1 ip address and the /24 to have the same subnet (255.255.255.0).
With /16 (255.255.0.0) I had issue on reaching 192.168.0.50. Guess due to missmatch in subnet settings.

Anyway with this it now runs smooth!
Two different device EoE parallel and EtherCat (48Byte PDO's to the two slaves) with 4ms.

Hello everybody,
I did many tests, and it seems that something is wrong.
I tested on Ubuntu 22.04, where the network management is different.
So I moved to a DEBIAN 11 but it is still not working.
At the end I can ping the ethernet port (in this note the eth1: 192.168.0.50), I can ping the bridge (br0: 192.168.0.51 or 192.168.0.99) but I cannot ping the ethercat device.
Could someone explain to me which are the interfaces involved and how to place the right IP addresses.

Thank you

Maurizio