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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 3-4 HART/analog single-loop wiring – External power
Figure 3-5 Required external voltage versus mA load resistance
Note: See Figure 3-5 for voltage and resistance values.
VDC
R
load
(250–600 Ohm
resistance)
–
+
+
HART-
compatible host
or controller
–
0
4
8
12
16
20
24
28
32
36
0 200 400 600 800 1000 1200 1400
If communicating with HART, a minimum of 250 Ohms is required.
Total mA load resistance (Ohms)
Minimum required external voltage (Volts)
OPERATING REGION