Process Value; Heating And Cooling Output Value - Siemens SIMATIC S7-1200 Function Manual
Pid control
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Using PID_Temp
6.2 Configuring PID_Temp
6.2.1.4
Process value
PID_Temp will scale the value of the analog input to the physical quantity if you use the
analog input value directly.
You will need to write a program for processing if you wish first to process the analog input
value. The process value is, for example, not directly proportional to the value at the analog
input. The processed process value must be in floating point format.
Procedure
Proceed as follows to use the analog input value without processing:
1. Select the entry "Input_PER" in the drop-down list "Input".
2. Select "Instruction" as source.
3. Enter the address of the analog input.
Proceed as follows to use the processed process value in floating point format:
1. Select the entry "Input" in the drop-down list "Input".
2. Select "Instruction" as source.
3. Enter the name of the variable in which the processed process value is saved.
6.2.1.5
Heating and cooling output value
The PID_Temp instruction provides a PID controller with integrated tuning for temperature
processes. PID_Temp is suitable for heating or heating-and-cooling applications.
PID_Temp provides the following output values. Your actuator will determine which output
value you use.
● OutputHeat
Heating output value (floating-point format): The output value for heating needs to be
processed by the user program, for example, because of non-linear actuator response.
● OutputHeat_PER
Analog heating output value: The actuator for heating is triggered via an analog output
and controlled with a continuous signal, e.g. 0...10 V, 4...20 mA.
● OutputHeat_PWM
Pulse-width modulated heating output value: The actuator for heating is controlled via a
digital output. Pulse width modulation creates variable ON and OFF times.
● OutputCool
Cooling output value (floating-point format): The output value for cooling needs to be
processed by the user program, for example because of non-linear actuator response.
● OutputCool_PER
Analog cooling output value: The actuator for cooling is triggered via an analog output
and controlled with a continuous signal, e.g. 0...10 V, 4...20 mA.
● OutputCool_PWM
Pulse-width modulated cooling output value: The actuator for cooling is controlled via a
digital output. Pulse width modulation creates variable ON and OFF times.
160
Function Manual, 03/2017, A5E35300227-AC
PID control
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