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Installation Manual 15
I/O Wiring – Model 2400S Analog Transmitters
Power Supply I/O Wiring – DP and DNI/O Wiring – ANBefore You Begin
Figure 3-5 Required external voltage versus mA load resistance
Figure 3-6 HART multidrop wiring – Internal or external power
0
4
8
12
16
20
24
28
30
0 200 400 600 800 1000 1200
If communicating with HART, a minimum of 250 Ohms is required.
Total mA load resistance (Ohms)
Minimum required external voltage (Volts)
OPERATING REGION
HART-compatible
host or controller
HART-compatible
transmitter
SMART FAMILY
™
transmitter
Note: For optimum HART communication, make sure the output loop
is single-point-grounded to an instrument-grade ground.
24 VDC loop power
supply required for
HART 4–20 mA
passive transmitters
600 Ohm maximum resistance
250 Ohm minimum resistance
Model 2400S
External power
Model 2400S
Internal power