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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
)
–
+
+
–