Siemens SIMATIC S7-1200 Function Manual page 432

Instructions
9.3 PID_Temp
State / Mode Description of operating mode
1 Requirements for pretuning heating:
Heat.EnableTuning = TRUE
•
Cool.EnableTuning = FALSE
•
The process value must not be too close to the setpoint.
•
|Setpoint - Input| > 0.3 * |Config.InputUpperLimit - Config.InputLowerLimit| and
|Setpoint - Input| > 0.5 * |Setpoint|
The setpoint is greater than the process value.
•
Setpoint > Input
Requirements for pretuning heating and cooling:
Heat.EnableTuning = TRUE·
•
Cool.EnableTuning = TRUE
•
The cooling output is activated (Config.ActivateCooling = TRUE).
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The PID parameter switching is activated (Config.AdvancedCooling = TRUE).
•
The process value must not be too close to the setpoint.
•
|Setpoint - Input| > 0.3 * |Config.InputUpperLimit - Config.InputLowerLimit| and
|Setpoint - Input| > 0.5 * |Setpoint|
The setpoint is greater than the process value.
•
Setpoint > Input
Requirements for pretuning cooling:
Heat.EnableTuning = FALSE·
•
Cool.EnableTuning = TRUE·
•
The cooling output is activated (Config.ActivateCooling = TRUE).
•
The PID parameter switching is activated (Config.AdvancedCooling = TRUE).
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A "pretuning heating" or "pretuning heating and cooling" has been successful (PIDSelf-
•
Tune.SUT.ProcParHeatOk = TRUE), if possible at the same setpoint.
The process value must be close to the setpoint.
•
|Setpoint - Input| < 0.05 * |Config.InputUpperLimit - Config.InputLowerLimit|
432
Function Manual, 03/2017, A5E35300227-AC
PID control