Function block implementation of a cause and effect matrix...

Details Function block implementation of a cause and effect matrix... Function block implementation of a cause and effect matrix...

2005-05-24

2005-05-24

Knight, Anthony (Department: 2121)

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Sequential or selective

C700S079000, C714S001000, C714S037000

Reexamination Certificate

active

06898468

ABSTRACT:
A cause and effect function block, which can be easily integrated into a function block diagram programming environment in a process plant safety system to implement the cause and effect logic specified by a traditional cause and effect matrix, includes a set of cause inputs and a set of effect outputs. A multiplexer within the cause and effect function block receives each of the cause inputs and is coupled to one or more state machines, with a separate state machine existing for each effect output. The multiplexer decodes each of the cause inputs and, based on the cause inputs and previously identified cause and effect matrix logic, provides a trip signal to one or more of the state machines. Upon receiving a trip signal, a state machine forces an associated effect output into a tripped or safe state. If desired, the state machine may then use one or more other signals, such as signals from a user or from the process, to transition between a set of different states used to safely return the process plant back to the normal operating state from the tripped or safe state.

REFERENCES:
patent: 5768119 (1998-06-01), Havekost et al.
patent: 6049578 (2000-04-01), Senechal et al.
patent: 6078320 (2000-06-01), Dove et al.
patent: 6292523 (2001-09-01), Senechal et al.
patent: 6369836 (2002-04-01), Larson et al.
patent: 20020198907 (2002-12-01), Klapper et al.
patent: WO-0038040 (2000-06-01), None
Great Britain Search Report under Section 17(5) issued in GB0406816.9 application by United Kingdom Patent Office on Jul. 29, 2004.
“CEM Programming Language Editor,” Triconex, located on the web at http://www.triconex.com/library/Tricon%20Technical%20Specifications%20-%20CEM%20Programming%20Language%20Editor.pdf, 2 pages.
“Simplified Safety System Programming,” Control Engineering.online, Sep. 1, 2000, 2 pages, available at http://www.manufacturing.net/ctl/index.asp?layout=article&articleid=CA211671, printed on Jun. 3, 2003.
“IEC 61131-3: a standard programming resource,” 8 pages, available at http://www.plcopen.org/intro_iec/intro_iec.htm, printed on May 15, 2003.
“QUADLOG Safety Matrix,” Moore Process Automation Solutions, located on the web at http://www.sea.siemens.com/process/docs/piql-16.pdf, 6 pages, Dec. 1998.
“A structured approach to the specification and implementation of Cause & Effect application logic in safety related PLCs,” TUV Rheinland, 4thInternational Symposium, PLCs in Safety Related Applications, Cologne, May 3rdto 4th, 2000, 18 pages.
“Safety Life Cycle Management with Cause and Effect Matrix Tools,” William M. Goble and John A. Cusimano, Dec. 31, 1969, Summary found on the web at http://searchpdf.adobe.com/proxies/1/63/15/8.html, 2 pages.

Affiliated with

Also associated with

Rating

Function block implementation of a cause and effect matrix... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Function block implementation of a cause and effect matrix..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Function block implementation of a cause and effect matrix... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3376641