Emerson 3051S Specifications Page 67

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41
Reference Manual
00809-0100-4803, Rev DA
Section 3: Configuration
April 2013
Configuration
Figure 3-22. Typical multidrop network
Enable multidrop communication
The 3051S MultiVariable Transmitter 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 1–15 for HART 5 hosts
or 1-63 for HART 6 hosts. This change deactivates the 4–20 mA analog output, sending it to a
fixed value of 4 mA. It also disables the failure alarm signal, which is controlled by the HI/LO
alarm switch position on the feature board. Failure signals in multidropped transmitters are
communicated through HART messages.
Loop current mode
When using multidrop communication, the loop current mode drop-down menu defines how
the 4-20 mA analog output behaves. When loop current mode is disabled, the analog output
will be fixed at 4 mA. When the loop current mode is enabled, the analog output will follow the
primary variable.
3.6.6 Materials of construction
The Materials of Construction tab allows the materials of construction, remote seal, and
equipped sensor information to be viewed. The parameters shown in white boxes may be edited
by the user, but do not affect the operation of the device.
Mass and Energy Flow Fast Keys 1, 4, 3, 3, 1
Direct Process Var. Output Fast Keys 1, 4, 3, 3, 1
Mass and Energy Flow Fast Keys 1, 4, 3, 3, 2
Direct Process Var. Output Fast Keys 1, 4, 3, 3, 2
Mass and Energy Flow Fast Keys 1, 4, 4, 2
Direct Process Var. Output Fast Keys 1, 4, 4, 2
Power
Supply
HART
Modem
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