H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 5/14 (2006.01) G05B 19/418 (2006.01)
Patent
CA 2047459
ABSTRACT OF THE DISCLOSURE The communicator made according to the present invention receives queries from a process controller and directs them to their intended destination after formatting them appropriately. The received query contains a process variable (PV) address section. A storage section stores the PV address, which is representative of a storage location for a process variable in a field device (FD). The FD is in a network of FDs where each FD has an FD type and a unique FD address. In an associating section, each of a plurality of FD addresses and the FD type corresponding to such FD address are associated with one PV address corresponding thereto and an output is provided which is representative of a corresponding address pair. An extracting section receives the stored PV address from the storing means and accesses the associating means, searching through the address pairs and extracting an output containing the FD address and the FD type corresponding to a PV address which matches the stored PV address. Finally, a generating section receives the extracted FD address and FD type and generates a FD request as a function of the PD type and containing the extracted FD address. The FD request is conveyed over a line common to the FDs, to the FD containing the stored PV address location. The storage section includes an IEEE serial interface for coupling to the process controller. In a preferred embodiment, the IEEE serial interface can be RS- 232, RS-422 or RS-485. In another embodiment, the storage section includes two IEEE serial interfaces, either couplable to the process controller. The storage section 7074A also has a bidirectional echoing section coupled between the IEEE serial interfaces for echoing a query received on one interface to the other interface. 7074A
Longsdorf Randy J.
Pederson David L.
Marks & Clerk
Rosemount Inc.
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