Siemens SIMATIC S7-1200 Function Manual page 161

The cooling output is only available if it was activated via the "Activate cooling" check box.
● If the check box is cleared, the output value of the PID algorithm (PidOutputSum) is
scaled and output at the outputs for heating.
● If the check box is selected, positive output values of the PID algorithm (PidOutputSum)
are scaled and output at the outputs for heating. Negative output values of the PID
algorithm are scaled and output at the outputs for cooling. You can choose between two
methods for output value calculation at the output settings.
Note
Note:
• The OutputHeat_PWM, OutputHeat_PER, OutputCool_PWM, OutputCool_PER outputs
are only calculated if you select these correspondingly from the drop-down list.
• The OutputHeat output is always calculated.
• The OutputCool output is calculated if the check box for cooling is selected.
• The "Activate cooling" check box is only available if the controller is not configured as a
master in a cascade.
Procedure
Proceed as follows to use the analog output value:
1. Select the entry "OutputHeat_PER" or "OutputCool_PER" in the drop-down list
"OutputHeat" or "OutputCool".
2. Select "Instruction".
3. Enter the address of the analog output.
Proceed as follows to use the pulse-width modulated output value:
1. Select the entry "OutputHeat_PWM" or "OutputCool_PWM" in the drop-down list
"OutputHeat" or "OutputCool".
2. Select "Instruction".
3. Enter the address of the digital output.
Proceed as follows to process the output value using the user program:
1. Select the entry "OutputHeat" or "OutputCool" in the drop-down list "OutputHeat" or
"OutpuCool".
2. Select "Instruction".
3. Enter the name of the variable you are using to process the output value.
4. Transfer the processed output value to the actuator by means of an analog or digital CPU
output.
PID control
Function Manual, 03/2017, A5E35300227-AC
Using PID_Temp
6.2 Configuring PID_Temp
161