Multiplex communications – Channel assignment techniques – Details of circuit or interface for connecting user to the...
Reexamination Certificate
2004-09-17
2009-10-27
Mattis, Jason E (Department: 2416)
Multiplex communications
Channel assignment techniques
Details of circuit or interface for connecting user to the...
C370S445000
Reexamination Certificate
active
07609714
ABSTRACT:
A duplexed network system is formed with a plurality of programmable controllers and two different networks. Each of the programmable controllers includes a CPU unit, a primary communication unit connected to one of these networks (the first network) and a secondary communication unit connected to the other of the networks (the second network). The primary communication unit serves to compile participation status of nodes connected to the first network. The CPU unit gives priority to the primary communication unit when a request to transmit a communication command is issued to both the primary and secondary communication units. The primary communication unit serves to judge, when a request to transmit a communication command to an addressee node is received from the CPU unit, whether transmission to the addressee node is possible based on the participation status of the first network, to transmit the communication command if the transmission is judged to be possible and to request the secondary communication unit to transmit the communication command if the transmission is judged to be not possible.
REFERENCES:
patent: 4748560 (1988-05-01), Kataoka
patent: 5329528 (1994-07-01), Akai et al.
patent: 2002/0089925 (2002-07-01), Smith et al.
patent: 2002/0179720 (2002-12-01), Liva et al.
patent: 2002/0196805 (2002-12-01), Brocco et al.
patent: 0 351 757 (1990-01-01), None
patent: 03-296344 (1991-12-01), None
patent: 05-252168 (1993-09-01), None
patent: 08-065331 (1996-03-01), None
patent: 09-186711 (1997-07-01), None
patent: 2001-156801 (2001-08-01), None
patent: 2002-215473 (2002-08-01), None
Patent Abstract of Japan Vo. 1999, No. 14, JP 11-252144 (Sep. 17, 1999).
European Search Report, Application No. EP04021950, Jan. 7, 2005.
Patent Abstracts of Japan, Publication No. 2001-156818,Node, Transmission Method, And Communication Unit For PLC, Yamada Hiroaki et al., published on Aug. 6, 2001.
Japan patent application No. 2003-326720, Examination Report mailed Apr. 18, 2007.
Ishikawa Makoto
Okeda Hideo
Tomita Kenichiro
Yamada Hiroaki
Chery Dady
Mattis Jason E
OMRON Corporation
Weaver Austin Villenueve & Sampson LLP
LandOfFree
Programmable controller and duplexed network system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Programmable controller and duplexed network system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable controller and duplexed network system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4101439