Siemens SIMATIC S7-1200 Function Manual page 359

Tag
PIDSelf-
Tune.TIR.CalculateTIR-
Params
PIDSelfTune.TIR.Tune-
RuleTIR
PIDSelfTune.TIR.State
Retain.Mode
Retain.CtrlParams.SetByUser
Retain.CtrlParams.Gain
Retain.CtrlParams.Ti
PID control
Function Manual, 03/2017, A5E35300227-AC
Data type Default Description
BOOL FALSE The properties of the controlled system are saved during tuning. If
CalculateTIRParams = TRUE, the PID parameters are recalculat-
ed on the basis of these properties. The PID parameters are calcu-
lated using the method set in TuneRuleTIR. CalculateTIRParams
is set to FALSE following calculation.
INT 0 Methods used to calculate parameters during fine tuning:
•
•
•
•
•
•
INT 0 The TIR.State tag indicates the current phase of "fine tuning":
INT 0 A change to the value of Retain.Mode initiates a switch to another
operating mode.
The following operating mode is enabled upon a change of Mode
to:
•
•
•
•
•
•
•
•
•
Mode is retentive.
BOOL FALSE If SetByUser = FALSE, the PID parameters are determined auto-
matically and PID_3Step operates with a dead zone at the output
value. The dead zone width is calculated during tuning on the
basis of the standard deviation of the output value and saved in
Retain.CtrlParams.OutputDeadBand.
If SetByUser = TRUE, the PID parameters are entered manually
and PID_3 Step operates without a dead zone at the output value.
Retain.CtrlParams.OutputDeadBand = 0.0
SetByUser is retentive.
REAL 1.0 Active proportional gain
Gain is retentive.
REAL 20.0
•
•
Ti is retentive.
TuneRuleTIR = 0: PID automatic
TuneRuleTIR = 1: PID fast
TuneRuleTIR = 2: PID slow
TuneRuleTIR = 3: Ziegler-Nichols PID
TuneRuleTIR = 4: Ziegler-Nichols PI
TuneRuleTIR = 5: Ziegler-Nichols P
Mode = 0: Inactive
Mode = 1: Pretuning
Mode = 2: Fine tuning
Mode = 3: Automatic mode
Mode = 4: Manual mode
Mode = 5: Approach substitute output value
Mode = 6: Transition time measurement
Mode = 7: Error monitoring
Mode = 8: Approach substitute output value with error monitor-
ing
Ti > 0.0: Active integral action time
Ti = 0.0: Integral action is deactivated
Instructions
9.2 PID_3Step
359