Working Online - Emerson 375 User Manual

HART Functionality
WORKING
ONLINE
Connecting to
a HART loop
The online mode displays data for the HART
device to which you are connected. The Online
menu displays critical, up-to-date process
information that is continuously updated, including
device setup, primary variable (PV), analog output
(AO), lower range value (LRV), and upper range
value (URV). For information about intrinsically
safe connections see Appendix B "Approval
Information".
A HART configuration created from a connected
HART device will initially be saved as a 375 device
configuration. Editing a device configuration within
the 375 Field Communicator will change it to a 375
user configuration.
The 375 Field Communicator can communicate
with a transmitter from the control room, the
instrument site, or any wiring termination point in
the loop.
Connect the 375 Field Communicator with the
appropriate connectors in parallel with the
instrument or load resistor. The HART connections
are not polarity sensitive.
In order for the 375 Field Communicator to function
properly, a minimum of 250 ohms resistance must
be present in the HART loop.
NOTE
Dynamic variables shown while online represent
the digital data being sent from the device.
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