Communications: electrical – Condition responsive indicating system – With particular system function
Reexamination Certificate
2006-07-25
2009-06-23
Crosland, Donnie L (Department: 2612)
Communications: electrical
Condition responsive indicating system
With particular system function
C340S538000, C340S538150, C340S315000, C340S315000, C340S315000
Reexamination Certificate
active
07551074
ABSTRACT:
Field devices are commonly used in unprotected environments, which means that these field devices and the conductor pairs connecting the field devices to the input modules/output modules of an automation installation are exposed to significant climatic and environmental factors. These factors have a detrimental effect on the transmission quality of the signals to be transferred between field devices and modules, which may result in erroneous measurements and dangerous operating states during control of a technical process. Measures to simplify monitoring of the transmission medium are proposed.
REFERENCES:
patent: 4106007 (1978-08-01), Johnston et al.
patent: 4429299 (1984-01-01), Kabat et al.
patent: 4719616 (1988-01-01), Akano
patent: 4742475 (1988-05-01), Kaiser et al.
patent: 5650777 (1997-07-01), Westfield et al.
patent: 198 34 863 (2000-02-01), None
Siemens “HART—Highway Addressable Remote Transducer”; SIMATIC PCS7 catalog, Chapter 12, 2005 edition.
Sun Guang-jun, “HART Field Communication Protocol”, 2001.
Crosland Donnie L
Siemens Aktiengesellschaft
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