Reference Manual
00809-0100-4801, Rev FA
October 2010
3-31
Rosemount 3051S Series
The 3051S 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/jumper position. Failure signals in
multidropped transmitters are communicated through HART messages.
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.
Field Communicator v3.3
1. From the HOME screen, enter the fast key sequence “Changing a
Transmitter Address.”
AMS v7.0
Right click on the device and select “Configure” from the menu
.
1. In the “HART” tab, in “ID” box, enter poll address located in the “Poll
addr” box, click Apply.
2. After carefully reading the warning provided, select yes.
Communicating with a
Multidropped
Transmitter
Field Communicator v3.3
To communicate with a multidropped transmitter, configure the Field
Communicator to poll for a non-zero address.
1. From the HOME screen, enter the fast key sequence “Communicating
with a Multidropped Transmitter.”
2. On the polling menu, scroll down and select “Digital Poll.” In this mode,
the Field Communicator automatically polls for devices at addresses
0-15 upon start up.
AMS v7.0
Click on the HART modem icon and select “Scan All Devices.”
Polling a Multidropped
Transmitter
Polling a multidropped loop determines the model, address, and number of
transmitters on the given loop.
Field Communicator v3.3
1. From the HOME screen, enter the fast key sequence “Polling a
Multidropped Transmitter.”
AMS v7.0
Click on the HART modem icon and select “Scan All Devices.”
Traditional Fast Keys
1, 4, 3, 3, 1
Device Dashboard
Fast Keys
1, 2
Traditional Fast Keys
Left arrow,
3, 1, 1
Device Dashboard
Fast Keys
1, 2
Traditional Fast Keys
Left arrow,
3, 1
Device Dashboard
Fast Keys
1, 2
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