Emerson Rosemount 3051S MultiVariable Reference Manual page 41

Reference Manual
00809-0100-4803
Figure 2-24: Typical Multidrop Network
A. Power supply
B. HART modem
Enable multidrop communication
Mass and energy flow Fast Keys
Direct process variable output Fast Keys
The Rosemount 3051SMV is set to address zero (0) at the factory, which allows operation
in the standard point-to-point manner with a 4-20 mA output signal. To activate
multidrop communication, the transmitter address must be changed to 1-15 for HART 5
hosts or 1-63 for HART 6 hosts. This change deactivates the 4-20 mA analog output,
sending it to a fixed value of 4 mA. It also disables the failure alarm signal, which is
controlled by the HI/LO alarm switch position on the feature board. Failure signals in
multidropped transmitters are communicated through HART messages.
Loop current mode
Mass and energy flow Fast Keys
Direct process variable output Fast Keys
When using multidrop communication, the loop current mode drop-down menu defines
how the 4-20 mA analog output behaves. When loop current mode is disabled, the analog
output will be fixed at 4 mA. When the loop current mode is enabled, the analog output
will follow the primary variable.
2.6.6 Materials of construction
Mass and energy flow Fast Keys
Direct process variable output Fast Keys
The Materials of Construction tab allows the materials of construction, remote seal, and
equipped sensor information to be viewed. The parameters shown in white boxes may be
edited by the user, but do not affect the operation of the device.
Emerson.com/Rosemount
1, 4, 3, 3, 1
1, 4, 3, 3, 1
1, 4, 3, 3, 2
1, 4, 3, 3, 2
1, 4, 4, 2
1, 4, 4, 2
Configuration
October 2018
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