| US 7,590,511 B2 | ||
| Field device for digital process control loop diagnostics | ||
| Garrie D. Huisenga, Chaska, Minn. (US); Richard A. Lewis, Medina, Minn. (US); and Donald R. Lattimer, Chaska, Minn. (US) | ||
| Assigned to Rosemount Inc., Eden Prairie, Minn. (US) | ||
| Filed on Sep. 25, 2007, as Appl. No. 11/860,780. | ||
| Prior Publication US 2009/0083001 A1, Mar. 26, 2009 | ||
| Int. Cl. G06F 11/00 (2006.01); G06F 11/30 (2006.01) | ||
| U.S. Cl. 702—183 [702/188] | 31 Claims |
| 1. A diagnostic field device for coupling to a two-wire process control loop of an industrial process control or monitoring
system, comprising;
power supply circuitry configured to coupled to the two-wire process control loop and provide a power output to circuitry
of the diagnostic device to thereby power the diagnostic device with power received from the two-wire process control loop;
digital communication monitoring circuitry configured to receive a digital communication signal from the two-wire process
control loop, the digital communication signal including loop timing data;
timing circuitry configured to provide a timing output comprising internal timing data; and
diagnostic circuitry configured to diagnose operation of the two-wire process control loop based upon the loop timing data
of the digital communication signal and the internal timing data of the timing output.
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