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US 7,752,511 B2Granted
Devices, systems, and methods regarding a PLC system fault
AssigneeSiemens Industry, Inc.
InventorsTemple L. Fulton, Lothar Trapp, Heiner Fuchs
Life of this patent
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Abstract
A method for providing a signal indicative of a set single bit flag, which is set for a scan cycle responsive to a detection of a fault in an Input/Output (I/O) device of a programmable logic controller (PLC) system or an I/O interface of the PLC system. Numerous other aspects are provided.
Claims19
A method comprising:
- providing a signal indicative of a set single bit flag, wherein:
- said flag is set for a first scan cycle in response to a detection of a fault in an Input/Output (I/O) device of a programmable logic controller (PLC) system or an I/O interface of said PLC system, and said flag is promptly reset at a conclusion of said first scan cycle;
- and
- said flag is set for a second scan cycle in response to a determination that said fault has been cleared, and said flag is promptly reset at a conclusion of said second scan cycle.
1 more element
A machine-readable medium comprising machine instructions for activities comprising:
- providing a signal indicative of a set single bit flag, wherein:
- said flag is set for a first scan cycle in response to a detection of a fault in an Input/Output (I/O) device of a programmable logic controller (PLC) system or an I/O interface of said PLC system, and said flag is promptly reset at a conclusion of said first scan cycle;
- and
- said flag is set for a second scan cycle in response to a determination that said fault has been cleared, and said flag is promptly reset at a conclusion of said second scan cycle.
1 more element
A system comprising:
- a circuit adapted to provide a signal indicative of a set single bit flag, wherein:
- said flag is set for a first scan cycle in response to a detection of a fault in an Input/Output (I/O) device of a programmable logic controller (PLC) system or an I/O interface of said PLC system, and said flag is promptly reset at a conclusion of said first scan cycle;
- and
- said flag is set for a second scan cycle in response to a determination that said fault has been cleared, and said flag is promptly reset at a conclusion of said second scan cycle.
1 more element
Dependencies are inferred from the claim text.