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NAT provides a means of taking up a single PLC IP address, supplied by the Internet Service Provider (ISP), as well as allowing multiple controllers to share the same Internet connection. The most appropriate way of routing the network traffic between a Wide Area Network (WAN) and LAN is through the use of a Network Address Translation (NAT). The router directs the IP traffic to the correct Ethernet device within the Local Area Network (LAN). Usually, the gateway address is assigned to an Ethernet router. Once the gateway address is added, the PLC can send and receive IP messages that are not established inside the local network. This is achieved by adding a gateway address to the Ethernet settings on the PLC controller. The first step in remotely connecting a PLC is to set up the controller to handle data communication from both the local network and wider networks like the Internet. These features and utilization of other Ethernet services such as FTP and web server make remote administration of a control process readily possible.
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Also, the Ethernet is used to program or/ and debug the internal software of the PLC controller. This Ethernet port controls the remote Input/Output devices on the Ethernet network based on protocols such as the EtherNet/IP, Modbus/TCP(UDP), Profinet, and others. The most recent PLCs are fitted with an Ethernet port on the controller. Since IP addresses are mainly used for PLC communication in remote locations, it is necessary to understand how the remote setup is done. The IPv6 uses 128bits for the IP address. This led to the development of IPv6 in 1995, though it wasn’t standardized until 1998, its deployment started in the mid-2000s and continues to date. IPv4 is still in scarce use today, but with the rapid developments in the internet age, a more advanced IP address was needed. IPv4 is the earliest version, dating back to when Internet Protocol was initially designed it consists of a 32-bit IP number. Since an IP address is a unique identifier, it enables PCs to send and receive information or data to and from specific PLCs or machines in a given network.Ĭurrently, there are two standards of IP addresses: Internet Protocol Version 4(IPv4) and Internet Protocol Version 6(IPv6). The IP address is an interface identifier for a network of systems or machines, it also provides the location of a specific piece of machinery or equipment, more like a physical address. In IP communication, each device in the network is identified by its Internet Protocol Address.
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The Ethernet cable consists of a series of communication protocols such as the Internet Protocol (IP), and the Transport Control Protocol (TCP).Īt the foundation of TCP/IP communication is IP communication. Most people associate the Ethernet with the physical cable behind machines, but this cable is just the physical part of the Ethernet, which acts as the transfer media. For instance, terminating the bottle fill operation in a Coca-Cola production facility would require more highly time-precise data communications than accessing the next page on a website. The Ethernet is becoming more popular with the increasing need for real-time or very close to real-time information links within the factory floor. An Internet Connection is all you need.Įthernet is one of the standard information networks that enable factory controllers like PLCs to access data embedded in Input/Output devices, operator workstations, and drive systems. The latest PLC technology gives you the ability to monitor operations via a website to check the condition of equipment or determine other statistics. This has been made possible by state-of-art PLCs that allow more and more automation to be handled through remote communication. Today, industrial automation is not limited by the walls of a factory facility anymore. The end goal is to ensure connectivity between different systems while making better use of the equipment and machines. In the wake of the Industrial Internet of Things (IIoT) era, the demand for more data from processes and systems that were not traditionally connected to industrial systems continues to increase.