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AssigneeAllen-Bradley Company, Inc.
InventorsWilliam B. Cook, Mark A. Flood, Steven P. Richter, Mark E. Taylor, Bradley J. Bittorf
Estimating the term…
An industrial controller provides a primary controller and a redundant secondary controller and allows switchover between the controllers in the event of a failure in the primary controller. The process of qualification of the secondary controller in which its programming is made to match the primary controller may be inhibited to permit the secondary controller to maintain a clean version of an upgraded program executing on the primary controller. The clean program may be reverted to in the event an upgrading of the program in the primary controller is unsuccessful. Switchover is permitted even though the qualification of the secondary controller is not enabled.
A secondary industrial controller providing redundancy for a primary industrial controller, the primary industrial controller having primary functional modules and having a primary memory containing a user program of instructions for execution to control an industrial process, and further holding data reflecting the state of the industrial process separate from the user program, the secondary industrial controller:
A method of testing a primary controller having a back-up secondary industrial controller, the primary controller having primary functional modules and having a primary memory containing a user program for execution to control an industrial process, the secondary industrial controller having secondary functional modules and a secondary memory including a version of the user program and a state flag set by a user command, the controller module further having a back-up circuit communicating with the memory and the functional modules and operating to:
Dependencies are inferred from the claim text.