Ulrik.V

Hi guys

I need to make a HVAC function. This function should be used for compensating the "room setpoint temperature" according to the outside temperature.

As an example...
Setpoint = 20.0 C
Outside = 27.0 C
Calculated setpoint = 18.0 C

Setpoint = 20.0 C
Outside = 5.0 C
Calculated setpoint = 22.0 C

I have made the function in other PLC's using a "Curve lookup" function
But how is it done the best in a S7-300 ?

Standard block for scaling through piecewise linear function