Weidmuller WI-I/O-9-U2: Wireless Mesh I/O & Gateway User Manual V1.2.2 - Manual (Page 36)

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Single Ended Voltage Inputs
All analog inputs can be setup to read voltage.
If using Analog input 1 & 2 connect the voltage source across the positive terminal of
the input and Common.
If using Analog input 3 & 4 then connect across the input terminal and Common.
Note:
Default scaling gives 0-20V for 4-20mA output on Analog 1 and 2.
Default scaling for analog 3 and 4 gives 0-5V for 4-20mA output.
For Voltage input on analog 3 and 4 set both Dip
Switches to the “Off” position”.
Figure 20 – Voltage Inputs
WI-IO 9-U2