Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se
Reexamination Certificate
2008-05-13
2008-05-13
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
C324S073100, C324S765010
Reexamination Certificate
active
07372248
ABSTRACT:
An electronic circuit having an input, an output with an input filter for delaying a change of an input signal and a control component for supplying an output signal and evaluating the input signal. The delay is a time constant. An industrial automation system is provide with the electronic circuit and a fail-safe component connected to an input and an output of the circuit. To increase the probability of detecting errors in the electronic circuit, the control component is provided for supplying a test signal for output through the output, for making a first evaluation of the input signal to be provided immediately after the output of a test signal and for making a second evaluation of the input signal after expiry of a time after output of the test signal which at least corresponds to the time constant. A method for testing an electronic circuit is also provided.
REFERENCES:
patent: 4519090 (1985-05-01), Stackhouse et al.
patent: 6477674 (2002-11-01), Bates et al.
patent: 6867613 (2005-03-01), Bienek
patent: 2004/0267479 (2004-12-01), Querbach et al.
Barthel Herbert
Binder Ingmar
Nguyen Vincent Q.
Siemens Aktiengesellschaft
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