Siemens SIMATIC S7-1200 Function Manual page 173

Pid control
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If the "Sampling time of PID algorithm" (Retain.CtrlParams.Heat.Cycle or
Retain.CtrlParams.Cool.Cycle) and thus the period duration of the pulse width modulation is
very high when OutputHeat_PWM or OutputCool_PWM is used, you can specify a deviating
shorter period duration at the parameters Config.Output.Heat.PwmPeriode or
Config.Output.Cool.PwmPeriode in order to improve smoothness of the process value (see
also PwmPeriode tag (Page 445)).
Note
The minimum ON and OFF times only affect the output parameters OutputHeat_PWM or
OutputCool_PWM and are not used for any pulse generators integrated in the CPU.
PID control
Function Manual, 03/2017, A5E35300227-AC
Using PID_Temp
6.2 Configuring PID_Temp
173

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