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Inputs
7 I/O functionality
Instruction book, IQAN-MC3
7 I/O functionality
This section contains information about how to connect and use the I/O, with specific
additional information about rules that apply when the I/O is used in a safety function.
Inputs
There are 3 types of inputs in the IQAN-MC3:
• Voltage inputs
• Digital inputs
• Frequency inputs
Voltage inputs
Connecting sensors to the voltage inputs
The range of the voltage inputs is 0-5 Vdc. For input characteristics, see Appendix A.
In order to detect errors such as "open circuit" in the wiring, the active signal range
from the sensor must be limited, e.g. 0.5-4.5 Vdc.
Active signal range.
The positive terminal of the sensor is connected to the +VREF position and the
corresponding negative terminal to the -VREF position. The sensor signal is connected
to appropriate VIN position.
EXAMPLE
Connect the positive and negative terminals of the position sensor to +VREF and

-VREF, respectively. Then connect the sensor signal to a VIN.
Connecting VREF and sensor signal VIN.
0
5
[V]
Active signal range
Error detection range
Error detection range
t
Position Sensor
IQAN-MC3
+VREF
-VREF
VIN