Internet access to the factory floor

Factory automation equipment may be remotely controlled and monitored from a website if a PLC (programmable logic controller) is used. Each machine can be linked to form a limited local network using their integrated Ethernet ports. While the local network is useful, the PLC accomplishes a more flexible level of control by linking the local network to a wider network such as the internet. This requires that each controller is given a gateway address so that it will recognize IP messages from outside the local network. Using network-address translation, a single IP address is used for all the devices on the local network. It is up to the router to determine the final destination of each packet by the port number in a process known as port-forwarding. This method requires administrators to take a few steps to ensure network security. Using embedded operating systems in each controller that is not commonly used will help cut down unsolicited requests for communication. Also, only opening ports that are intended to be used will also make the network more secure. If further security is desired, data can be sent over a virtual-private network.  Read the full article in Machine Design.

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