Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2005-07-05
2005-07-05
Chung, Phung My (Department: 2133)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S715000, C714S758000, C714S701000
Reexamination Certificate
active
06915444
ABSTRACT:
A highly reliable industrial control system is produced using a network running a standard serial protocol on two redundant messages. A safety protocol is embedded within the standard serial protocol by adding to special error detecting data redundant with the protocol of the standard serial network. In addition, only a single network protocol module (CAN) is necessary to transfer two logical messages of data between modules. In order to still provide redundancy, the data on one of the messages is encoded in a predetermined manner, such as by inverting each bit of data, prior to transmission over the network. The data is then decoded at the destination module and compared to the data on the other logical message to determine whether a transmission error has occurred. Safety protocol may be implemented in an additional level for integrated circuits or through firmware changes in programmable aspects of the industrial controller components.
REFERENCES:
patent: 5245616 (1993-09-01), Olson
patent: 5642354 (1997-06-01), Spear
patent: 5910778 (1999-06-01), Klein et al.
patent: 5920581 (1999-07-01), Lang
patent: 6044480 (2000-03-01), Keen
patent: 6229437 (2001-05-01), Schmid et al.
patent: 6601210 (2003-07-01), Kagan
patent: 6721900 (2004-04-01), Lenner et al.
patent: 0 977 391 (2000-02-01), None
CANopen Safety: Safety-relevant communication, elektroniknet, Dec. 15, 2000 (Abstract).
Controller Area Network (CAN), Philips, International CAN Conference, Las Vegas, Dec. 3-5, 2001 (Abstract).
Microcontrollers, Philips, Apr. 13, 2001 (Abstract).
K. Cevik, CANopen SIG Safety, Fachhochschule Bielefeld, University of Applied Sciences, vol. 1, pp. 1-11, 1999.
D.A. Glanzer, “Interoperable Fieldbus Devices: A Technical Overview,” ISA Transactions 35:147-151, 1996.
Esalan Safety Field Bus Control System, Elan Schaltelemente GmbH.
EBUS 6000 Product List, Safenet Information, pp. 1.0-10.00, 1999.
Pilz, Safe Bus Systems, pp. 5-20, 1998.
Pilz, Review Extract, pp. 1-8, 1999.
Profisafe . . . in order to protect, 1999.
Profibus, Fail Safe with Profibus, pp. 1-57, 1999.
Safenet, Integrated Safety Control System, Smartscan.
Appendix A German Safety Bus Commitee Specification, Draft Proposal of a Guideline for the Test and Certification of “Bus Systems for the Transmission of Safety Relevant Messages,” Fachausschuss Elektrotechnik, Gustav-Heinemann-Ufer 130, 1999.
CANopen, Framework for Safety-Relevant Communication, Version 0.94 dated Sep. 12, 2000, CAN in Automation e.V.
Lenner Joseph A.
Vasko David A.
Chung Phung My
Quarles & Brady LLP
Rockwell Automation Technologies Inc.
Speroff R. Scott
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