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I want to connect my PLC with Codesys. When i scan for the network in communication settings, the gateway is green but it does not find any device.

When I connect the same PLC with my laptop it works but when i try to connect with the monitor near the PLC Codesys does not find the device.

I also have the SoftPLC which is on, but still no response.

May I know what may be the reason?

Nehal Trivedi
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  • Don't know if this will help in your case, but I use Modicon controllers, and they require a driver be installed and running on my machine for me to be able to connect to them. Usually when I can't connect, it's because of that for me. Manually starting the driver (form Services), or installing it if missing helps me. Your case will probably be different though... – Guiorgy Jun 24 '22 at 16:54
  • I don't know if this will help you, but I've had a similar problem connecting through a local network with a router. I solved it by enabling network discovery in Windows settings on my PC. If you are on a secure network, try to disable the firewall to test as well. – dwpessoa Jun 30 '22 at 16:45
  • I think there is a way to connect directly to a PLC without having to run the Scan if you have the plc IP (I imagine you have already tested the network with a ping in cmd). unfortunately I can't test this right now, but you can look it up in codesys settings – dwpessoa Jun 30 '22 at 16:49
  • @dwpessoa tried the way you suggested it did not work. – Nehal Trivedi Jul 06 '22 at 10:27

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You can directly fill in the IP-address of the PLC. This way you don't need to use 'scan network' to find the PLC first.

Jouke Aalvanger
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