7-10
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
5
10
15
20
25
30
Supply voltage (volts
)
External pull-up
resistor rang
e (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.
Instruction and Operation Manual
X-CM-QmBS-eng
Part Number: 541B052AHG
June, 2008
Section 7 I/O Wiring FM CIO Transmitter
QmBS Sensor / QTA Transmitters
