Emerson FB3000 RTU Instruction Manual
D301851X012
May 2022
50
I/O Configuration and Wiring
3.6.1.2
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 3-11
shows how to wire a HART channel for multi-drop mode. Multi-drop mode
only supports 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 3-11: HART Wiring – Multi-Drop Mode on Channel 1
HD HART Device
Содержание FB3000
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