Inputs and Outputs

The RAC18-IP is equipped with 18 inputs and outputs:

• 4 universal inputs;

• 4 digital inputs;

• 3 analog outputs;

• 5 digital outputs;

• 2 triac outputs.

Universal Inputs

The RAC18-IP device is equipped with 4 universal inputs.

Universal inputs support four types of input signals:

• voltage (0-10 V DC, input impedance 100 kΩ);

• current (0-20 mA);

• resistance and temperature measurement (10k thermistor, a full list of supported temperature sensors is available here: List of Supported Temperature Sensors);

• dry contact (output current 1 mA).

Universal Input Voltage Connection

Universal Input Current Connection

Current measurement is realized by voltage measurement and 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 Resistance Connection

Universal Input Dry Contact Connection

Digital Inputs

The RAC18-IP device is equipped with 4 digital inputs.

Digital inputs operate as standard dry contact inputs and, additionally, as high speed pulse counters up to 100 Hz.

Digital Input Counter

A digital input can work as a counter of dry contact pulses up to 100 Hz. The connection is identical as in case of the dry contact input.

Analog Outputs

The RAC18-IP is equipped with 3 analog outputs.

Analog outputs provide a 0-10 V DC output with maximum load up to 20 mA. They support three types of output signals:

• voltage (0-10 V DC) with maximum load up to 20 mA;

• digital;

• Pulse Width Modulation (PWM) 0,01 Hz, 0,1 Hz, 1 Hz, 10 Hz, 100 Hz.

Analog Output Voltage Connection

Analog Output Relay Connection

Analog Output Actuator Connection

Digital Outputs

The RAC18-IP is equipped with 5 digital outputs.

Digital outputs operate as relay outputs with maximum loads of:

• resistive load: 3 A @ 230 V AC, and 3 A @ 30 V DC;

• inductive load: 75 VA for 230 V AC and 30 W for 24 V DC.

Digital Output Electrovalve Connection

Digital Output Resistive Load Connection

Digital Output Inductive Load Connection (DC)

Digital Output Inductive Load Connection (AC)

Triac Outputs

The RAC18-IP device is equipped with 2 triac outputs.

Triac outputs work as typical binary outputs or in Pulse Width Modulation (PWM) mode: 0,01 Hz, 0,1 Hz, 1 Hz, 10 Hz.