Emerson Rosemount 2051 Reference Manual page 33

Reference Manual
00809-0100-4107
Device Manager can test, configure, and format a multidropped transmitter the same way
as a transmitter in a standard point-to-point installation.
Figure 2-18
diagram.
Figure 2-18: Typical multidrop network (4–20 mA only)
A. HART modem
B. Power supply
Emerson sets the product to address zero (0) at the factory, which allows operation in
the standard point-to-point manner with a 4–20 mA (1–5 Vdc) output signal. To activate
multidrop communication, change the transmitter address to a number from 1 to 15 for
HART Revision 5, or 1–63 for HART Revision 7. This change deactivates the 4–20 mA (1–5
Vdc) analog output, sending it to 4 mA (1 Vdc). 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.
2.10.1 Changing a transmitter address
To activate multidrop communication, you must assign the transmitter poll address to a
number from 1 to 15 for HART
Each transmitter in a multidropped loop must have a unique poll address.
Change a transmitter address using a communication device
Procedure
From the HOME screen, enter the fast key sequence:
Fast keys
Change transmitter address using AMS Device Manager
Complete the following steps to change the transmitter address, in order to activate
multidrop communication, using AMS Device Manager.
Procedure
1. Right-click the device and select Configure.
2. Go to Manual Setup → HART.
Emerson.com
shows a typical multidrop network. This figure is not intended as an installation
Revision 5 and 1 to 63 for HART Revision 7.
®
HART
2, 2, 5, 2, 1
Revision 5
®
Configuration
February 2024
HART Revision 7
2, 2, 5, 2, 2
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