Emerson FB3000, Руководство по установке

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FB3000 RTU HART ® I/O Module Field Installation Guide
D301918X012
June 2021
7
Figure 3 shows how to wire a HART channel for devices which do not use loop power but get power
from an external power supply.
Figure 3. HART Wiring – External Power Supply
HD HART Device
P
External 24V Power Supply
Analog Input Mode (HART Communication Disabled)
If you have an unused HART channel, you can use it as a 4-20mA analog input (AI current mode).
In FBxConnect, you must Enable the 250 Ohm Termination Resistor and set the HART Comm Mode
to Disabled.
Figure 4 shows two examples for wiring a HART channel as a 4-20mA analog input. In the figure, an
externally powered current loop transmitter connects to Channel 1 and a loop powerd current loop
transmitter connects to Channel 4.