MINI and MIX Series I/O modules/Modbus
version 1.3
www.gc5.pl
Page 23 / 73
3
Local I/O
3.1
Universal Inputs connections
Connection of Universal Input to measure voltage 0 – 10V
Figure 18 Connection of UI to measure 0-10 VDC for MIX38 and MIX38-IP
Connection of Universal Input to measure current 0 – 20 mA
Current measurement is realized by voltage measurement and 200 Ω resistance. According
to the Ohm’s law the current is directly proportional to the voltage and the resistance as the
constant of proportionality.
𝑰 =
𝑼
𝑹
According to the Ohm’s low equation for 20 mA current with 200 Ω resistance the output
voltage is 4 V. It means that the voltage 4 V on the Universal Input corresponds to 20 mA
current.
The result is expressed in millivolts.
Figure 19 Connection of UI to measure 0-20 mA for MIX38 and MIX38-IP