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.

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.

analog circuit design plc siemens voltage

One Answer

schematic

^{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..

Answered by Tony Stewart EE75 on January 2, 2022

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

One Answer

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