Analog outputs

Analog outputs serve for control of external devices such as three-way valves or heat exchangers through 0-10V analog voltage signal. Devices are to be connected to AOG and AO terminals. As the output is galvanically isolated, it is necessary to source voltage for AOG and AOV (up to 35 VDC).

Unipi 1.1

Analog outputs are available only on Unipi 1.1

The following image illustrates the connection of a device to analog output using the internal power supply:

The following image illustrates the connection of a device to analog output using an external power supply:

The analog output on Unipi 1.1 does not feature its own power source and require an external power supply. In some installations, you can use the 12 VDC internal power supply for DI.

Most of regulated devices have their own power source. If the voltage is within 35 VDC, you can use it to power the board's AO while retaining galvanic isolation.

Output terminals AO
Terminal for connecting the external power supply negative pole AOG
Terminal for connecting the external power supply positive pole AOV
Number of outputs 1
Maximum input voltage (AOV) 35 VDC
Maximum current on the AO terminal 20 mA
Galvanic isolation Yes
Input functions 0–10 V voltage source
Measuring accuracy ±0.5 %

AO is regulated using a 400 Hz PWM signal.

On the current Unipi 1.1 version, the 0% PWM duty cycle is written onto output as 0 VDC. 100% PWM duty cycle is interpreted as 10 VDC on the output. That means 0-100% duty cycle linearly corresponds to 0-10 VDC voltage on the analog output

Older variants interpreted 0% PWM duty cycle as AO = 10 VDC, and 100% PWM duty cycle as AO = 0 VDC.