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AT_Gain has a modbus address of 12052 and can be written to via the fieldbus.
It should be noted that AT_Gain is internally linked to the parameter Global_gain (MB4394).
During autotuning process At_gain displays the result of autotuning. The value 100% corresponds to the theoretical optimum .
Both parameters are coupled .
If you increase Globalgain then AT_gain increases also.