(19)

(11)

EP 1 419 420 A1

(12)

(43) Date of publication: 19.05.2004 Bulletin 2004/21 (21) Application number: 02768655.9 (22) Date of filing: 23.08.2002

(51) International Patent Classification (IPC)7: G05B 19/00, G06F 9/54 (86) International application number: PCT/US2002/026696 (87) International publication number: WO 2003/019304 (06.03.2003 Gazette 2003/10)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 23.08.2001 US 314093 P (71) Applicant: Fieldbus Foundation Austin, TX 78759 (US)	(72) Inventors: GLANZER, David, A. Georgetown, TX 78628 (US) NEITZEL, Lee, A. Austin, TX 78759 (US) GOFF, Donald, B. Austin, TX 78727 (US) (74) Representative: Needle, Jacqueline  W.H. BECK, GREENER & CO7 Stone BuildingsLincoln's Inn London WC2A 3SZ London WC2A 3SZ (GB)