Emerson Micro Motion LF Series Installation Manual page 35

Flowmeter
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I/O Wiring – FM AN Transmitters
Figure 6-3. RS-485 point-to-point wiring
Primary
controller
Multiplexer
Other devices
Figure 6-4
HART multidrop wiring with SMART FAMILY
HART-compatible
host or controller
600 Ω maximum resistance
250 Ω minimum resistance
LF-Series Flowmeters: Sensor/Transmitter Installation
RS-485/A
RS-485/B
Note: The RS-485 communication wires must be shielded.
HART-compatible
transmitters
LF-Series FM AN
transmitter
Note: For optimum HART communication, make sure the output
loop is single-point-grounded to an instrument-grade ground.
transmitters and a configuration tool
SMART FAMILY
transmitters
24 VDC loop power
supply required for
passive transmitters
29

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