Emerson Rosemount 248 Reference Manual page 37

Reference Manual
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3.4.6 Information variables
Access the transmitter information variables on-line using the Field Communicator or
other suitable communications device. Following is a list of transmitter information
variables which include device identifiers, factory-set configuration variables, and other
information. A description of each variable and a review of its purposes are provided.
Tag
The Tag variable is the easiest way to identify and distinguish between transmitters in
multi-transmitter environments. Use it to label transmitters electronically according to the
requirements of the application. The tag defined is automatically displayed when a HART-
based Communicator establishes contact with the transmitter at power-up. The tag may
be up to eight characters long and has no impact on the primary variable readings of the
transmitter.
Long Tag
The Long Tag is similar to Tag. The long tag is different in that the Long tag can be up to 32
Characters instead of the eight characters in traditional Tag.
Date
The Date command is a user-defined variable that provides a place to save the date of the
last revision of configuration information. It has no impact on the operation of the
transmitter or the Field Communicator.
Descriptor
The Descriptor variable provides a longer user-defined electronic label to assist with more
specific transmitter identification than is available with the tag variable. The descriptor
may be up to 16 characters long and has no impact on the operation of the transmitter or
the Field Communicator.
Message
The Message variable provides the most specific user-defined means for identifying
individual transmitters in multi-transmitter environments. It allows for 32 characters of
information and is stored with the other configuration data. The message variable has no
impact on the operation of the transmitter or the Field Communicator.
Sensor serial number
The Sensor S/N variable provides a location to list the serial number of the attached
sensor. It is useful for identifying sensors and tracking sensor calibration information.
Rosemount 248 Temperature Transmitter Reference Manual
Configuration
May 2019
37