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40 LF-Series Flowmeters: Sensor/Transmitter Installation
I/O Wiring – FM CIO Transmitters
Figure 7-15 Recommended pull-up resistor versus supply voltage – External power
7.6 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.
If external power is configured, power may be supplied by a PLC or other device, or by direct DC
input. See Table 7-2 for input voltage ranges.
Table 7-2 Input voltage ranges for external power
VDC Range
3–30 High level
0–0.8 Low level
0.8–3 Undefined
4400
51015202530
Supply voltage (volts)
External pull-up resistor range (ohms)
Recommended
resistor value range
400
600
800
4200
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.