Siemens Simatic S7-1500 - Page 432

Instructions
9.3 PID_Temp
PID control
432 Function Manual, 03/2017, A5E35300227-AC
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).
• 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).
• 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|