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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

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.

Figure 3-13 Discrete input wiring – Internal power

Figure 3-14 Discrete input wiring – External power

Table 3-2 Input voltage ranges for external power

VDC Range

3–30 High level

0–0.8 Low level

0.8–3 Undefined

–

PLC or

other device

ORVDC

(see Table 3-2

)

Direct DC input

(see Table 3-2

)

–

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Emerson 2400S Manuale di Installazione Pagina 23