Emerson Rosemount 3051 Manual page 41

Manual
00809-0100-4007
NOTICE
A multidrop transmitter has a fixed analog output of 4 mA for all but one device. Only one
device is allowed to have an active analog signal.
Figure 2-17: Typical multidrop network
A. HART modem
B. Power supply
Emerson sets the Rosemount 3051 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, you must change the transmitter address to a number from
1 to 63. This change deactivates the 4-20 mA analog output, sending it to 4 mA. It also
disables the failure mode alarm signal, which is controlled by the upscale/downscale switch
position. HART messages communicate failure signals in multidropped transmitters.
2.12.1 Changing a transmitter address
To activate multidrop communication, you must assign the transmitter poll address to a
number from 1 to 63.
Each transmitter in a multidropped loop must have a unique poll address.
Change a transmitter address using a communication device
Procedure
Go to Device Settings → Output (or Communication) → HART → Communication Settings
→ Change Polling Address.
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March 2023
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