Emerson 1700 Manuel D’Utilisation
50
Micro Motion
®
Model 1700 and 2700 Transmitters
Output Wiring – Model 2700 Configurable I/O Transmitters
Figure 6-15
Recommended pull-up resistor versus supply voltage – External power
6.6
Discrete input wiring
Discrete input wiring depends on whether you have configured terminals 5 and 6 (Channel C) for
internal or external power. The following diagrams are examples of proper wiring for these
configurations.
internal or external power. The following diagrams are examples of proper wiring for these
configurations.
If external power is configured, power may be supplied by a PLC or other device, or by direct DC
input. See Table 6-2 for input voltage ranges.
input. See Table 6-2 for input voltage ranges.
Table 6-2
Input voltage ranges for external power
VDC
Range
3–30
High level
0–0.8
Low level
0.8–3
Undefined
4400
5
10
15
20
25
30
Supply voltage (Volts)
Ex
tern
al
p
u
ll
-up
r
esi
stor
r
a
ng
e
(O
hms
)
Recommended
resistor value range
400
600
800
4200
4000
3800
3600
3400
3200
3000
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
4000
3800
3600
3400
3200
3000
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
Note: When using a discrete output to drive a relay, choose
external pull-up to limit current to less than 500 mA.
external pull-up to limit current to less than 500 mA.