Siemens SIMATIC S7-1200 - Page 427

Instructions
9.3 PID_Temp
PID control
Function Manual, 03/2017, A5E35300227-AC
427
Tag
Data type
Default
Description
Retain.CtrlParams.Cool.Ti REAL 20.0 Active integral action time for cooling in seconds
The integral action for cooling is switched off with
Cool.CtrlParams.Ti = 0.0.
Cool.Ti is retentive.
Only effective if the cooling output and PID parameter
switching are activated (Config.ActivateCooling = TRUE
and Config.AdvancedCooling = TRUE).
100000.0 ≥ Cool.Ti ≥ 0.0
Retain.CtrlParams.Cool.Td REAL 0.0 Active derivative action time for cooling in seconds
The derivative action for cooling is switched off with
Cool.CtrlParams.Td = 0.0.
Cool.Td is retentive.
Only effective if the cooling output and PID parameter
switching are activated (Config.ActivateCooling = TRUE
and Config.AdvancedCooling = TRUE).
100000.0 ≥ Cool.Td ≥ 0.0
Retain.CtrlParams.Cool
.TdFiltRatio
REAL 0.2 Active derivative delay coefficient for cooling
The derivative delay coefficient delays the effect of the
derivative action.
Derivative delay = derivative action time × derivative delay
coefficient
•
0.0: Derivative action is effective for one cycle only and
therefore almost not effective.
• 0.5: This value has proved useful in practice for con-
trolled systems with one dominant time constant.
• > 1.0: The greater the coefficient, the longer the effect
of the derivative action is delayed.
Cool.TdFiltRatio is retentive.
Only effective if the cooling output and PID parameter
switching are activated (Config.ActivateCooling = TRUE
and Config.AdvancedCooling = TRUE).
Cool.TdFiltRatio ≥ 0.0
Retain.CtrlParams.Cool
.PWeighting
REAL 1.0 Active weighting of the proportional action for cooling
The proportional action may weaken with changes to the
setpoint.
Values from 0.0 to 1.0 are applicable.
• 1.0: Proportional action for setpoint change is fully
effective
• 0.0: Proportional action for setpoint change is not ef-
fective
The proportional action is always fully effective when the
process value is changed.
Cool.PWeighting is retentive.
Only effective if the cooling output and PID parameter
switching are activated (Config.ActivateCooling = TRUE
and Config.AdvancedCooling = TRUE).
1.0 ≥ Cool.PWeighting ≥ 0.0