# Universal Inputs

All universal inputs have 16-bit ADC, which supports the following types of input signals:

- voltage input (0-10 V DC);
- current input (0-20 mA);
- resistive input (0-1000 kΩ);
- temperature input;
- dry contact input (digital input).

## Voltage Input Connection (0-10 V DC)

**Universal input voltage connection**

## Current Input Connection (0-20 mA)

The current measurement is realized by a voltage measurement and a 200 Ω resistance.

According to Ohm’s law, the current is directly proportional to the voltage, and the resistance is the constant of proportionality (I = U / R).

According to the Ohm’s law equation, for 20 mA current with 200 Ω resistance the output voltage is 4 V.

It means that the 4 V voltage measured on the universal input corresponds to 20 mA current.

The result is expressed in millivolts.

**Universal input voltage connection**

## Temperature Input Connection

The temperature measurement is based on a resistance.

The universal inputs, working as temperature inputs, support the following types of sensors: series NTC 10K3A1, 10K4A1, Carel 10K, 20K6A1, 2.2K3A1, 3K3A1, 30K6A1, SIE1, TAC1, SAT1, and PT1000, NI1000.

**Universal input voltage connection**

## Dry Contact Input Connection (Digital Input)

The universal inputs can operate as standard digital inputs (dry contact inputs).

The input is active if it is connected to the ground (G0).

**Universal input voltage connection**