I have a very simple demo application using a:
- Raspberry pi 4b.
- UGreen 10/100/1000 MB USB 3.0 networkadapter.
- Codesys soft-PLC for the raspberry pi (Codesys V3.5 SP17 Patch 2 64-bit).
The demo applicatition looks as follows:
What have i done:
- I've downloaded the xml descriptor files.
- Inserted the EtherCAT Master.
- Inserted a buscoupler.
- Inserted a EL1008 DI module.
- Inserted a EL2008 DO module.
When start the application i get the following messages from the logging:
Scanning doesn't find any devices. When i first connect the application it seems to try to communicatie. I
see the communication leds blinking now and then and after a while it stops.
However for linux the interface seems to be working. ifconfig eth1 shows it transmits packets but doesnt
Any help is appreciated.
does the same configuration work on eth0?
if you plug an usb ethernet adapter a reboot/runtime restart is needed.
The problem was that the UGREEN USB 3.0 adapter was NOT on the list of hardware for the Raspberry pi. So I bought a USB 2.0 Belkin adapter, which was on the list of compatible hardware (https://elinux.org/RPi_VerifiedPeripherals).
However the're is a problem with both network adapters when booting the Raspberry pi. The are not recognized at boot time. So rebooting was not an option.
Using eth0 would probably work. What i tried is using the USB network adapter on eth1 for connection with the soft-plc, ssh, nomachine. But I couldn't get it working.
After that I disabled tcp/ip in the dhcpcd.conf file with the options noipv4 and noipv6 after interface eth1. But don't know if thats necessary?
But when I put the Belkin adapter in the Raspberry pi after a reboot it is perfectly recognized, I use the dmesg command for that.
Now when i use:
sudo /etc/init.d/codesyscontrol stop
sudo /etc/init.d/codesyscontrol start
It works perfectly.
- I still have to solve the booting problem. Assuming I use eth0 for SSH, codesys: Will a
PiHAT with an extra ethernet port be a possibility ? Will it work better in combination
with the codesys soft PLC ? Can you give me any advise ?
- I think the problem with the booting might be a problem when the system boots the
usb-> ethernet driver is not loaded so the networkadapter might not be recognized.
For a PiHAT may be the modules (ethernet driver) is loaded earlier in the booting process.
If I can solve that problem is there a way to kickstart the EtherCAT bus manually
from a program in the soft-PLC? This would give me the possibility to start the bus without
restarting the soft-PLC ?
Thanks in advance.
I found out that when booting from sd-card the usb to ethernet adapter is recognised ok. Only when i boot from usb (using a M.2 Expansion Board voor Argon ONE) different USB to ethernet adapters will not be recognised at boot time.
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