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RM640
9.3.2 Multi-Drop connection (2-wire connection)
Up to 63 devices may be installed in parallel (this signal converter and other HART® devices).
For an illustration of multi-drop networks, refer to
For data on communication in multi-drop mode, refer to
104.
9.4 HART® device variables
HART® device variable
sensor value
level
distance
reflection
level linearization
volume conversion
mass conversion
distance linearization
ullage volume conversion
ullage mass conversion
1 This HART® device variable is available if you created a linearization table in the conversion menu
2 This HART® device variable is available if you created a strapping table in the conversion menu
The HART® dynamic variables PV (Primary Variable), SV (Secondary Variable), TV (Third Variable)
and QV (Fourth Variable) can be assigned to any of the device variables.
The HART® dynamic variable PV is always connected to the HART® current output which is, for
example, assigned to level measurement.
9.5 Field Communicator 475 (FC 475)
The Field Communicator is a hand terminal from Emerson Process Management that is
designed to configure HART® and Foundation Fieldbus devices. Device Descriptions (DDs) are
used to integrate different devices into the Field Communicator.
9.5.1 Installation
CAUTION!
The Field Communicator cannot be used to correctly configure, operate or read data from the
device unless the Device Description (DD) file is installed.
System and software requirements for the Field Communicator
• System card that includes the "Easy Upgrade Option"
• Field Communicator Easy Upgrade Programming Utility
• HART® Device Description file
For more data, refer to the Field Communicator User's Manual.
34-VF-25-131 iss.1 GLO Feb 2019 US
DESCRIPTION OF HART INTERFACE
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www.honeywellprocess.com
Multi-drop networks
HART
® network configuration on page
Type
linear
linear
linear
linear
linear
linear
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on page 55.
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