Network programmable logic controller system
Patent 4969083 Issued on November 6, 1990. Estimated Expiration Date: 
April 4, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 4, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesProgrammable logic controller Asynchronous dual function multiprocessor machine control Digital control system with Boolean processor Automatic end-of-scan control system for a programmable process controller with expandable memory Programmable controller for executing block transfer with remote I/O interface racks Boolean processor for a progammable controller Patent #: 4716541 InventorAssigneeApplicationNo. 176831 filed on 04/04/1988US Classes:700/18Specific programming (e.g., relay or ladder logic)ExaminersPrimary: Smith, JerryAssistant: Gordon, Paul P. Attorney, Agent or FirmInternational ClassG01F 013/10AbstractA programmable logic controller system having the capability of controlling up to 64 clusters of peripheral controllers, wherein each cluster has up to seven racks of peripheral controllers, each rack having up to 16 individual peripheral controllers. Excepting for the cluster containing the programmable logic controller, each cluster is coupled to the programmable logic controller through an ethernet cable to a cluster controller. Each of the seven racks of peripheral controller cards is connected to its respective programmable logic controller or cluster controller directly (for the first rack) or through a local rack adaptor (for the other six racks). The programmable logic controller generates data, address and control signals which are used by the peripheral controllers to operate machines and equipment on an assembly line. The data, address and control signals are generated by a ladder diagram created and modified in a separate personal computer, which may be coupled to the programmable logic controller through an ethernet cable. The code representing the ladder diagram created in the personal computer is downloaded through the ethernet cable to the programmable logic controller. | |
