Hi,
I assume you’re asking for the meaning of the configuration parameters from this config dialog, right?
The PLC doesn’t have a default IP.
You can decide to set a own static IP address and network mask (not your notebooks IP, because every IP has to be unique inside a IP network) , or you can activate “Get IP from DHCP server” (then, if a DHCP server exists in your network, the PLC will get an address from this server).
In both cases, the notebook and the PLC have to be in the same IP network, because if not they can’t communicate.
The default gateway normally is the IP address from your internet router - it’s only needed if the PLC should communicate with remote networks for example with the internet or via remote access (for example, when the PLC should be reachable via a remote maintenance router) - if notebook and PLC are both in the same IP network and should only communicate to each other, then the default gateway is not needed.
The setting “IP address from node number” means: the first 3 byte of the own set IP address are used like configured by you, the last byte is set from the number you configure with the both number switches on the top of the IF card).
The “IP address and network” topic isn’t PLC specific, (almost) all devices connected with an ethernet network are communicating via the IP protocol in the same manner, and also need some of the same basic settings like address, subnet masks and so on.
If you’re new to the topic of IP networking, I recommend first to make yourself familiar with some of the basic concepts if IP networks, for example here:
Here in the community, there’s also a little glossary available (but that’s not a guide, it’s only for explaining some of the most often used phrases of IP networking together with PLCs):
Best regards!