Siemens SIMATIC S7-1200 Function Manual page 169

Example:
Output scaling when the OutputHeat output is used (cooling deactivated. The low limit of PID
output value (heating) (Config.Output.Heat.PidLowerLimit) may be unequal to 0.0):
Example:
Output scaling when the OutputHeat_PWM and OutputCool_PER outputs are used (cooling
activated. The low limit of PID output value (heating) (Config.Output.Heat.PidLowerLimit)
must be 0.0):
With the exception of the "Inactive" operating mode, the value at an output always lies
between its scaled high output value and the scaled low output value, for example for
OutputHeat always between the scaled high output value (heating)
(Config.Output.Heat.UpperScaling) and the scaled low output value (heating)
(Config.Output.Heat.LowerScaling).
If you want to limit the value at the associated output, you therefore have to adapt these
scaling values as well.
You can configure the scaling values of an output at the vertical axes of the scaling
characteristic line. Each output has two separate scaling values. These can only be changed
for OutputHeat_PWM, OutputCool_PWM, OutputHeat_PER and OutputCool_PER if the
corresponding output is selected in the basic settings. The cooling has to be activated
additionally in the basic settings at all the outputs for cooling.
The trend view in the commissioning dialog box only records the values of OutputHeat and
OutputCool, irrespective of the selected output in the basic settings. Therefore, if necessary,
adapt the scaling values for OutputHeat or OutputCool if you use OutputHeat_PWM or
OutputHeat_PER or OutputCool_PWM or OutputCool_PER and want to use the trend view in
the commissioning dialog.
PID control
Function Manual, 03/2017, A5E35300227-AC
Using PID_Temp
6.2 Configuring PID_Temp
169