24
Reference Manual
00809-0300-4410, Rev BA
Configuration
January 2018
Configuration
Field Communicator
AMS Device Manager
1. Right click on the device and select
Configure
.
2. Select the
HART
tab.
3. Enter the configuration in Burst Mode Configuration fields.
2.14
Establishing multidrop communication
Multidropping transmitters refers to the connection of several transmitters to a single communications
transmission line. Communication between the host and the transmitters takes place digitally with the
analog output of the transmitters deactivated.
Multidrop installation requires consideration of the update rate necessary from each transmitter, the
combination of transmitter models, and the length of the transmission line. Communication with
transmitters can be accomplished with HART modems and a host implementing HART protocol. Each
transmitter is identified by a unique address and responds to the commands defined in the HART
protocol. Field Communicators and AMS Device Manager can test, configure, and format a multidropped
transmitter the same way as a transmitter in a standard point-to-point installation.
shows a typical multidrop network. This figure is not intended as an installation diagram.
Figure 2-17. Typical Multidrop Network (4–20 mA only)
A. HART modem
B. Power supply
The Rosemount 2051G 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 for HART Revision 5, or 1–63 for HART
Revision 7. 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.
From the
HOME
screen, enter the Fast Key sequence
Device Dashboard Fast Keys
2, 2, 5, 3
A
B
Содержание Rosemount 2051G
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