Neagative setpoint counter/temperature

Hi Forum members,

"I am new to the forum and also a beginner with Logo.

I am working on a project to create a heater/cooler system using Logo and Logo TDE.

Users want to set a temperature from -20 to +30 degrees.

For example, if I want -10 degrees, the cooler should run until that temperature is reached.

If they want 20 degrees, then the heater should turn on.

I have progressed to the point where the heater can work

My issue now is that I cannot set my setpoint below 0 degrees.

In other words, I cannot input negative temperatures.

Is there anyone who has a tip/solution for this?

All help is welcome."

Block 008 = up/down counter (setpoint wanted temperature in cooler)

Block 016 = comparator between pt100 and value from block 008

Regards Michel

Hi,

this works perfect. Thanks for the verry fast answer!

Michel