Our instrument guys are having trouble communicating with a HART 275
communicator to a Rosemont 3051 level transmitter while connected to the
Foxboro I/A FBM1 input point. The instrument is being loop powered by the
FBM1 (P and P+). The only way we can get it to communicate is to put a 250
ohm resistor across the pair of wires (parallel). This allows us to
communicate with the transmitter but we will not want to do this will the
instrument is in service. I have tried this with several different HART
275s, FBM1s and 3051 level transmitters. If we disconnect the loop from I/A
and use an Altec to power the loop, everything works as it should. This
eliminates our cabling as a problem, in my humble opinion.
Has anyone else experienced this problem? Is there a solution to allow the
communicator to work without a resistor across the pair of wires?
Rory Loupe
The Dow Chemical Company
LHC-3
P.O. Box 150, Building 6801 21255 highway 1,
Building 6801
Plaquemine, LA 70765-0150 USA Plaquemine, LA 70764 USA
Phone: 225.353-6409 Fax: 225.353.6968
E-mail: [EMAIL PROTECTED]
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