"Smart" watchdog safety switch
Abstract
A method and apparatus for monitoring a process having a periodic output so that the process equipment is not damaged in the event of a controller failure, comprising a low-pass and peak clipping filter, an event detector that generates an event pulse for each valid change in magnitude of the filtered periodic output, a timing pulse generator, a counter that increments upon receipt of any timing pulse and resets to zero on receipt of any event pulse, an alarm that alerts when the count reaches some preselected total count, and a set of relays that opens to stop power to process equipment. An interface module can be added to allow the switch to accept a variety of periodic output signals.
- Inventors:
-
- 353 Church Rd., Beech Island, SC 29842
- Issue Date:
- Research Org.:
- E I DUPONT DE NEMOURS & CO INC
- OSTI Identifier:
- 868009
- Patent Number(s):
- 5054023
- Assignee:
- Kronberg, James W. (353 Church Rd., Beech Island, SC 29842)
- Patent Classifications (CPCs):
-
G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING
- DOE Contract Number:
- AC09-76SR00001
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- smart; watchdog; safety; switch; method; apparatus; monitoring; process; periodic; output; equipment; damaged; event; controller; failure; comprising; low-pass; peak; clipping; filter; detector; generates; pulse; valid; change; magnitude; filtered; timing; generator; counter; increments; receipt; resets; zero; alarm; alerts; count; reaches; preselected; total; set; relays; stop; power; interface; module; added; allow; accept; variety; signals; output signals; pulse generator; output signal; interface module; process equipment; event detector; /714/
Citation Formats
Kronberg, James W. "Smart" watchdog safety switch. United States: N. p., 1991.
Web.
Kronberg, James W. "Smart" watchdog safety switch. United States.
Kronberg, James W. Tue .
""Smart" watchdog safety switch". United States. https://www.osti.gov/servlets/purl/868009.
@article{osti_868009,
title = {"Smart" watchdog safety switch},
author = {Kronberg, James W},
abstractNote = {A method and apparatus for monitoring a process having a periodic output so that the process equipment is not damaged in the event of a controller failure, comprising a low-pass and peak clipping filter, an event detector that generates an event pulse for each valid change in magnitude of the filtered periodic output, a timing pulse generator, a counter that increments upon receipt of any timing pulse and resets to zero on receipt of any event pulse, an alarm that alerts when the count reaches some preselected total count, and a set of relays that opens to stop power to process equipment. An interface module can be added to allow the switch to accept a variety of periodic output signals.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}
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