Emerson 2400S User Manual
Installation Manual
19
I/O Wiring – Model 2400S Analog Transmitters
P
o
wer Su
ppl
y
I/O
W
irin
g
W
irin
g
– DP
an
d
d
DN
I/
O W
iri
n
g
– AN
Be
fo
fo
re
Y
Y
o
u
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:
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.
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)
Exter
nal
p
u
ll-u
p
re
sisto
r 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.
less than 500 mA.