Management of redundant addresses in standby systems

A first network adapter, comprising:

• a non-transitory memory configured to store computer executable instructions;
• a network interface configured to communicate with a device over a network, wherein the network interface is assigned an assigned Internet Protocol (IP) address;
• and
• a processor configured to control operation of the first network adapter, the processor configured to execute the computer executable instructions stored in the memory, the computer executable instructions when executed being configured to cause the processor to perform:
• receiving, from a central processing unit of a programmable logic controller, an address indication identifying a particular IP address, wherein the first network adapter is located in the programmable logic controller;
• receiving, from the central processing unit, an address indication, and indication of an operational status of the programmable logic controller, and a selection indication;
• if the selection indication is set to a first state, determining the assigned IP address to be the particular IP address identified by the address indication;
• and
• if the selection indication is set to a second state, determining the assigned IP address based on the operational status;
• and
• configuring the network interface with the assigned IP address.

An industrial automation system comprising:

• a first programmable controller including:
• a first central processing unit;
• and
• a first network adapter;
• and
• a second programmable controller including:
• a second central processing unit configured to:
• determine a second operational status of the second programmable logic controller;
• communicate with the first programmable logic controller to obtain a first operational status of the first programmable logic controller;
• determine a calculated mode of operation of the second programmable logic controller from the first operational status and the second operational status;
• determine a first Internet Protocol (IP) address based on the calculated mode of operation, wherein either the first programmable logic controller or the second programmable logic controller is capable of functioning as a primary controller;
• and
• determine a selection indication;
• and
• a second network adapter configured to:
• receive, from the second central processing unit, an indication of the first IP address, an indication of the second operational status, and the selection indication;
• if the selection indication is set to a first state, determine an assigned IP address to be the first IP address;
• if the selection indication is set to a second state, determine the assigned IP address based on the second operational status;
• and
• configure the second network adapter with the assigned IP address.

A non-transitory computer-readable storage medium storing computer-executable instructions that, when executed, are configured to cause a processor to perform a method comprising:

• receiving an indication of a particular Internet Protocol (IP) address based on a calculated operational mode of operation of a first programmable logic controller;
• receiving a selection indication;
• receiving an indication of an operational status of the first programmable logic controller;
• if the selection indication is set to a first state, determining an assigned IP address to be the particular IP address;
• if the selection indication is set to a second state, determining the assigned IP address based on the indicated operational status;
• and
• configuring a first network adapter of the first programmable logic controller with the assigned IP address.