Emerson Rosemount 2051 Reference Manual page 63

Reference Manual
00809-0100-4101
Figure 3-6: Typical multidrop network
A. HART Modem
B. Power Supply
The 2051 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 a number from 1 to 15. 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. Failure
signals in multidropped transmitters are communicated through HART messages.
3.12.1 Changing a transmitter address
To activate multidrop communication, the transmitter poll address must be assigned a
number from 1 to 15, and each transmitter in a multidropped loop must have a unique poll
address.
HART communicator
Table 3-20: Fast keys
4-20 mA Fast Keys
1-5 Vdc Fast Keys
AMS device manager
Right-click on the device and select Configuration Properties.
Procedure
1. In the HART tab, in ID box, enter poll address located in the Poll addr box.
2. Click Apply.
3. Read and understand the warning provided.
4. Select Yes.
Reference Manual
A
B
1, 4, 3, 3, 1
1, 4, 3, 3, 1
Configuration
March 2024
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