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LF-Series Flowmeters: Sensor/Transmitter Installation 63
I/O Wiring – DIN CIO Transmitters
I/O Wiring – DIN CIO Return PolicySpecificationsI/O Wiring – DIN AN
Figure 10-15 Recommended pull-up resistor versus supply voltage – External power
10.6 Discrete input wiring
Discrete input wiring depends on whether you have configured terminals 31 and 32 (Channel C) for
internal or external power. The following diagrams are examples of proper wiring for these
configurations:
• Internal power – Figure 10-16
• External power – Figure 10-17
If external power is configured, power may be supplied by a PLC or other device, or by direct DC
input. See Table 10-2 for input voltage ranges.
Table 10-2 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.