Emerson 2400S - Manual (Page 23)

Installation Manual 19
I/O Wiring – Model 2400S Analog Transmitters
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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
OR VDC
(see Table 3-2
)
Direct DC input
(see Table 3-2
)
–
+
+
–