Siemens SIMATIC S7-1200 Function Manual page 75

Setpoint V2
Procedure
Proceed as follows to define a fixed setpoint:
1. Select "Instance DB".
2. Enter a setpoint, e.g. 80° C.
3. Delete any entry in the instruction.
Proceed as follows to define a variable setpoint:
1. Select "Instruction".
2. Enter the name of the REAL variable in which the setpoint is saved.
Program-controlled assignment of various values to the REAL variable is possible, for
example for the time controlled change of the setpoint.
Process value V2
PID_Compact 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.
PID control
Function Manual, 03/2017, A5E35300227-AC
Using PID_Compact
4.2 PID_Compact V2
75