How to vary the voltage output depending on the changes in temperature?

Electrical Engineering Asked by NatD on January 2, 2022

I am working with the Siemens Logo8! PLC (0BA8 version) and the purpose of my circuit seems to be simple:

If temp > 25°C then output voltage = 8V

If temp < 25°C and >15°C then output voltage = 5V

If temp <15°C then output voltage = 2V

Is there a possible way in a circuit of doing this?

I achieved a similar concept by using one Analog Input, then 2 Analog Threshold Triggers connected to a latching relay and eventually to a Digital Output. (Picture attached) However, the limitations of that system is that Voltage can be either 1 or 0.
enter image description here

The concept behind the circuit seems to be simple but I am really struggling to make it work and any hints will be much appreciated.

One Answer


simulate this circuit – Schematic created using CircuitLab

I'll send invoice on schematic entry cost ;)

and if you don't understand my schematic , try this one which I had no trouble understanding in university undergrad in my day..

enter image description here

Answered by Tony Stewart EE75 on January 2, 2022

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