Hello!!!

I need an option to enable auto tuning of PID from HMI 

is it possible ?

Same like is there any possibilities to change Module parameters from HMI ? ie the parameters what are all we are doing in hardware configuration for thermocouple ?

I think it may be possible that you can enable autotuning methods by using HMI.

I have used automatic methods for both PID_Compact and PID_3Step but I have never tried to apply for PID_Temp, in your case you will use thermocouple and you will control temperature and you will use PID_Temp function block.

For more information you can examine this document;

PID Function manual

Multi-Zone Control with "PID_Temp” for SIMATIC S7-1200/S7-1500

PID parameters

The PID parameters are displayed in the "PID Parameters" configuration window.

If cooling is activated in the basic settings and PID parameter switching is selected as the

method for heating/cooling in the output settings, two parameter sets are available: One for

heating and one for cooling.

In this case, the PID algorithm decides on the basis of the calculated output value and the

control deviation whether the PID parameters for heating or cooling are used.

If cooling is deactivated or the cooling factor is selected as the method for heating/cooling,

the parameter set for heating is always used.

During tuning, the PID parameters are adapted to the controlled system with the exception of

the dead zone width that has to be configured manually.

Note

The currently active PID parameters are located in the Retain.CtrlParams structure.

Change the currently active PID parameters only in "Inactive" mode online to prevent

malfunction of the PID controller.

If you want to change the PID parameters in "Automatic mode" or "Manual mode" online,

change the PID parameters in the CtrlParamsBackUp structure and apply these changes

with LoadBackUp = TRUE to the Retain.CtrlParams structure.

Online changes to the PID parameters in "Automatic mode" can result in jumps at the output

value.

PID_Temp is a PIDT1 controller with anti-windup and weighting of the proportional and

derivative actions.