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Installation Manual 19
I/O Wiring – Model 2400S Analog Transmitters
Power Supply I/O Wiring – DP and DNI/O Wiring – ANBefore You Begin
Figure 3-12 Recommended pull-up resistor versus supply voltage – External power
3.4.4 Discrete input wiring
Discrete input wiring depends on whether you will use internal or external power. The following
diagrams are examples of proper wiring for these configurations:
• Internal power – Figure 3-13
• External power – Figure 3-14
If external power is configured, power may be supplied by a PLC or other device, or by direct DC
input. See Table 3-2 for input voltage ranges.
Table 3-2 Input voltage ranges for external power
VDC Range
3–36 High level
0–0.8 Low level
0.8–3 Undefined
6
400
800
1200
1600
2000
2400
2800
3200
3600
4000
4400
4800
5200
12 18 24 30 36
Supply voltage (Volts)
External pull-up resistor range (Ohms)
Recommended
resistor value range
Note: When using a discrete output to drive a relay, choose external pull-up to limit current to
less than 500 mA.