What two addresses must be configured correctly for Ethernet communication between a PLC and a PC?

For Ethernet communication between a Programmable Logic Controller (PLC) and a Personal Computer (PC), the essential addresses that must be configured correctly are the IP address and the MAC address.

The IP address is a unique identifier for each device on a network, allowing them to communicate with one another. The MAC address, on the other hand, is a hardware address that uniquely identifies each network interface card (NIC) on the local network. The combination of these two addresses allows for successful data transmission over an Ethernet network.

While the gateway and subnet mask are important for defining the network's structure and enabling communication across different networks, they are not specifically the addresses used for direct communication between a PLC and a PC within the same local area network (LAN). Similarly, the DNS (Domain Name System) is used for resolving domain names to IP addresses but is not necessary for the basic communication between two Ethernet devices.

Therefore, ensuring that both the IP address and the MAC address are correct is crucial for establishing reliable Ethernet communication in this context.