Graphical interfaces for monitoring ladder logic programs
June 14, 2011. 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 References 3686639 3813649 3882305 Sequence block display system Industrial control processor system Memory programming control system for storing a wire number program of a ladder diagram for a programmable controller Integrated circuit controller programmable with unidirectional-logic instructions representative of sequential wire nodes and circuit elements of a ladder diagram Programmable dual stack relay ladder line solver and programming panel therefor Programmable dual stack relay ladder diagram line solver and programming panel therefor with prompter Sequence display controlling method and controller InventorApplicationNo. 556958 filed on 07/20/1990US Classes:714/46, Operator interface for diagnosing or testing700/18, Specific programming (e.g., relay or ladder logic)714/47Performance monitoring for fault avoidanceExaminersPrimary: Kulik, Paul V.Assistant: Orzech, Jennifer M. Attorney, Agent or FirmInternational ClassG06F 009/00AbstractA menu-driven system for developing Man-Machine Interfaces (MMI) for use in the graphical monitoring of ladder logic programs executing in programmable logic controllers PLCs. The Man-Machine Interfaces graphically depict plant processes controlled by the PLC. Data from the PLC representing plant process events (flows, state changes, tank levels, etc.) are communicated to the Man-Machine Interfaces. A Development System provides a programmer's "tool box" for constructing the Man-Machine Interfaces. Ladder logic programs and databases associated therewith are imported and accessed by the Development System for use in the development of the Man-Machine Interfaces. A Runtime System provides an execution environment for the Man-Machine Interfaces. The Runtime System has the ability to access ladder logic programs during monitoring operations. A user can "hot-key" to the ladder logic program for trouble-shooting purposes.Other References
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