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AssigneeRockwell Automation Limited
InventorsThomas B. Meagher, Gerald R. Creech, Philip J. Agar, Shelby A. Murrell, Ian D. W. Jones
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This invention relates to an apparatus and method for output current control in an Industrial Process Control System, The output module comprises two management units each of which calculates the current demand for the module independently from one another. One management unit controls an output current controller whilst the other unit monitors the current produced by the output current controller against an independently calculated demand. The output module has multiple output modules. However rather than one module providing a backup for the other modules, or alternating between use of each module, in normal operation, each module provides a portion of the required output current, the total output current being equal to the sum of the currents output by each module. In the event of failure on one of the modules, the other module or modules switch to providing the total current required.
An apparatus for industrial process control comprising one or more input modules, one or more processing modules and one or more analogue output modules an analogue output module of said one or more analogue output modules comprising:
A method of testing cutoff switches in an industrial process control comprising one or more input modules, one or more processing modules and one or more analogue output modules the method comprising:
Dependencies are inferred from the claim text.