Emerson FB3000 Manual de instalación - Página 8

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FB3000 RTU HART

I/O Module Field Installation Guide

D301918X012

June 2021

Multi-Drop Mode

In Multi-Drop Mode, only the HART digital signaling (FSK – Frequency Shift Keying) is present and

no 4-20mA analog current signal is permitted (no AO allowed). Each device can support a

maximum 4mA bias current. Because the maximum rated output (sink) current of any 3HRT04

Module channel is 20mA, and each device can draw 4mA, a HART channel in multidrop mode

supports a total of 5 HART devices. With each of the 5 HART devices permitted to draw 4mA, the

sum of the currents is 20mA – the maximum current.

Figure 2

inputs, you cannot have multi-drop outputs.

You can wire each channel the same way to allow for up to 20 HART devices (5 per channel).

Figure 2. HART Wiring – Multi-Drop Mode on Channel 1

shows how to wire a HART channel for multi-drop mode. Multi-drop mode only supports

HART Device